[0:01] foreign so in this video we'll just do a
[0:04] quick uh we'll just do a quick overview
[0:06] of how to install ffmpeg now first of
[0:09] all you must always check if you have
[0:10] ffmpeg installed uh just open up any
[0:13] terminal and type out FFM Peg uh if you
[0:17] see all of this here it means that
[0:19] ffmpeg is already installed you don't
[0:21] have to install it in case you do have
[0:24] to install it uh the and if you have
[0:27] Homebrew installed okay if you have
[0:29] Homebrew installed you can simply write
[0:31] group install ffmpeg that is you could
[0:34] simply do Groove install if you can Peg
[0:37] and that would work if you do not have
[0:40] Homebrew installed I highly recommend
[0:42] that you should have it how do you
[0:44] install Homebrew just Google home brew
[0:47] and you will land on this page brew.sh
[0:50] and all you have to do is copy and paste
[0:53] this line just copy it right from here
[0:55] paste enter it may ask you for your
[0:58] password that would be it it will
[1:00] install Homebrew you may may have to
[1:03] restart your terminal so once you have
[1:06] home brew installed once you have
[1:09] Homebrew installed you can go back to
[1:10] this and do Brew install ffap that is
[1:13] right through install effect right here
[1:15] it should work out in case you don't
[1:18] know what a terminal is uh
[1:20] FFM bank is then not for you you have to
[1:23] be comfortable with the terminal before
[1:25] you can understand how to use ffmpeg
[1:28] okay apart from that that's it this is
[1:30] it was a quick video thank you
[1:37] so in this video we are going to learn
[1:38] how to trim how to trim video parts or
[1:42] how to extract a particular segment of a
[1:46] video
[1:47] so I have a couple of sample videos here
[1:49] so I have a one minute timer video here
[1:51] I hope you can see this so this one
[1:54] minute timer video is nothing it's just
[1:56] a video of a minute it's a one minute
[1:58] long video but I also have a timer added
[2:01] to it you can see there's a timer right
[2:03] up of here
[2:05] so there's a timer added on the upper
[2:07] right hand corner it matches with how
[2:09] long the video has been going on it's
[2:11] just a time lapse simple video of
[2:14] so as you can see this it's showing 20
[2:16] seconds and we are 20 seconds into the
[2:18] video as well so this is just a sample
[2:20] video just to understand uh at what time
[2:22] frame are we working at
[2:25] so now how do you trim a section out of
[2:28] a video very quickly
[2:30] for example if we take for example if
[2:33] you want to remove the first 10 seconds
[2:36] but keep the rest now keep in mind this
[2:37] is a one minute video it's a one minute
[2:39] video so if you want to remove the first
[2:42] 10 seconds we want to remove the first
[2:45] 10 seconds
[2:48] that is we want to keep the video from
[2:51] 10 seconds up to one minute now in that
[2:53] case how do we in that case how do we do
[2:56] that so first of all I am in my ffmpeg
[2:59] directory this is the directory which
[3:00] contains all of these files you can
[3:02] check this out by using LS I hope you
[3:05] can see this very clearly
[3:07] uh in any case I'll just make this a
[3:10] little bit bigger unless yes I hope this
[3:12] should be very this should be visible
[3:13] anyways so now how do I remove the first
[3:16] 10 seconds but keep the rest
[3:19] now for that we must begin the video at
[3:21] 10 seconds and how do we achieve that
[3:23] very simply ffmpeg the command is ffmpeg
[3:26] now we give the input file that is given
[3:30] by minus I now here I am using one
[3:33] minute timer as my input file so ffmpeg
[3:36] I one minute uh underscore timer as my
[3:39] input file so minus I here is the input
[3:41] file now when do we want to start our
[3:45] output file we want to start from the
[3:48] 10th second because we want to remove
[3:49] from 0 to 10 so we want to start the
[3:51] file at the 10th second so we start it
[3:54] by using minus SS now SS tells you the
[3:57] start timer of our output video now
[4:01] there are two ways in which we can do
[4:02] this we could have done this either as
[4:03] 10 okay now 10 here stands for 10
[4:06] seconds I'll just give an example and
[4:09] then we'll give the output file name
[4:10] let's say let's say the output file name
[4:13] is 10 to
[4:15] 10 to end I'll just tell you why did I
[4:18] do an end dot MP4
[4:21] okay I did an mp4 here so
[4:25] let me just add one more thing here slow
[4:27] okay now you'll just see in a second why
[4:29] did I append this slow word here so if
[4:31] we do this if we do this right here if I
[4:33] run this command you will see
[4:37] so we see a lot of output and then there
[4:40] is something that is going on here
[4:43] so as you can see that the speed is 0.8
[4:46] X which means that a one minute video
[4:48] would take somewhat longer than a minute
[4:50] or almost a minute
[4:54] so you can see that we have completed 20
[4:56] seconds of this now of course this is a
[4:59] this is a slightly slower method there
[5:01] is also a faster method both of them
[5:04] have their advantages and disadvantages
[5:06] we'll come to that in just a second
[5:09] so let's just complete this one
[5:16] all right so this is done so when it is
[5:18] when it is over my command front returns
[5:20] my command prompt returns so now if you
[5:23] look right here so there is a 10 to end
[5:25] slope the output file that I had written
[5:28] here was 10
[5:30] to end was 10 to end slow and if I were
[5:33] to open up this file remember we removed
[5:36] the first 10 seconds we removed the
[5:38] first 10 seconds so if I all right why
[5:41] don't we do that why don't we first take
[5:43] the fast one as well so if now there is
[5:45] one more way that we could have done
[5:46] this done this faster as well
[5:49] same command okay but instead of going
[5:52] to add one more thing here minus C copy
[5:54] okay minus C copy and I'm going to
[5:58] change this to fast
[6:00] okay now you will see what did I do here
[6:02] so this one took us almost a minute uh
[6:06] this one minute video almost took us a
[6:08] minute and what about this one pay
[6:10] attention
[6:12] and it's done already okay it's done
[6:14] already so you could see that this fast
[6:18] one is already done whereas that took us
[6:19] about a minute this one is done only so
[6:22] now what is the difference between this
[6:24] slow process and this fast process now
[6:27] remember we remove the first 10 seconds
[6:29] so if I were to open up this slow one
[6:32] it started exactly I think you'll see
[6:34] this right here okay so if I were to
[6:36] restart this video
[6:41] okay so it is going to start exactly at
[6:45] 10 seconds we remove the first 10
[6:47] seconds so it's going to start exactly
[6:48] at 10 seconds that if I play it it's a
[6:51] 50 second video
[6:53] so it go it's it is going to go up to a
[6:55] minute
[6:58] okay but if I were to play this fast
[7:01] video now the issue here is it's going
[7:06] to start at three okay it started at 13.
[7:08] so basically so basically
[7:12] it started at 12 actually it started at
[7:14] 12 I cannot go any further back okay I
[7:17] cannot go any further back it is the
[7:19] video has started at 12 only
[7:22] okay now so why did this happen or or
[7:26] what is the advantage or disadvantage of
[7:29] this slow method versus this fast method
[7:31] the slow method is accurate it will it
[7:34] will give you the exact duration it will
[7:36] start at the exact time that you have
[7:38] mentioned it will stop at the exact time
[7:40] that you have mentioned but the first
[7:41] one has an error of a couple of seconds
[7:44] so if but it but it takes place very
[7:48] fast it happened very very quickly so if
[7:50] you are fine with a couple of seconds
[7:52] being up or down then I recommend you go
[7:54] by the fast method but if you have to
[7:57] maintain accuracy uh if you have to
[8:01] maintain complete accuracy of the time
[8:03] mentioned then I recommend that you go
[8:04] by the slow method okay so let me just
[8:07] copy it on both of these commands
[8:09] uh now one more thing so I as you can
[8:11] see that there is a lot of output here
[8:13] so how do we reduce all of this output
[8:16] as well because there's a lot of useless
[8:17] data here as well I'll just quickly copy
[8:19] this so this was the first one
[8:24] so this was the first one okay and then
[8:29] the slow one
[8:35] uh there was no C copy here
[8:39] okay I named it slow
[8:43] you can see the full Command right here
[8:46] okay so this was a this was the slow one
[8:50] this was the first one it took almost a
[8:52] minute this took place almost instantly
[8:54] now so this is how do you remove the
[8:56] first 10 seconds how about if you want
[8:58] to remove the last 10 seconds okay now
[9:01] uh if you if you already know the time
[9:03] frame that makes it much much easier
[9:05] okay so let's say that since we all know
[9:08] that this is a one one minute video and
[9:10] I want to and I want to remove the last
[9:13] 10 seconds okay that is in this case my
[9:16] video would actually be from zero
[9:19] seconds to 50 seconds okay obviously
[9:23] sometimes you may not know the duration
[9:24] will we will check on that example as
[9:26] well but let's say key you do not know
[9:28] how let's say that in this case we do
[9:30] know
[9:31] uh what is the duration of the video
[9:32] file
[9:33] now the format for now the format for
[9:36] that is
[9:37] the format for that is ffmpeg same thing
[9:40] minus I one minute underscore timer this
[9:43] is our input file okay now here what we
[9:46] want to do is want to keep it from the
[9:48] beginning up to 50 seconds okay so from
[9:51] the beginning up to 50 seconds if you
[9:52] are starting the file right from the
[9:54] beginning we do not have to mention the
[9:55] SS part this is not required if you are
[9:58] starting the file from the beginning but
[10:00] since we want to end at this particular
[10:02] time interval we can either use minus t
[10:05] 50 okay this tells me that I have to go
[10:08] up to 50 seconds or I could also use t o
[10:11] up to 50. both of these mean the same
[10:14] thing in this context here but I usually
[10:16] go with Dash T it's easier and and uh
[10:19] less lot less confusing
[10:21] so t50 and then let's give it as
[10:25] [Music]
[10:27] 0 to 50 let's keep this as slow dot MP4
[10:33] okay now this is again a 50 second video
[10:35] Let's see now so one more thing that I
[10:37] was about to tell you is how do you
[10:39] prevent all of that output for from
[10:41] coming so there is a very simple way to
[10:43] do that that is hide underscore Banner
[10:46] okay this is part one of it how do you
[10:49] reduce the output and the other part is
[10:52] log level
[10:55] Panic okay now if you use these two
[10:59] flags your output would be very limited
[11:01] and you won't see a lot of useless
[11:03] output so if you run that
[11:07] okay so as you could see there is that
[11:09] there is almost no output I think we
[11:11] should have put log level info here so
[11:13] that at least you could have known
[11:15] if this command is working or not
[11:21] I think we're going to stop this one
[11:23] right here and let's put this as log
[11:26] level info
[11:30] okay this is slightly better it will
[11:32] give you some information
[11:34] so I am going to do the exact same thing
[11:36] here so the command is exactly the same
[11:38] ffmpeg this is just to reduce the amount
[11:40] of output one minute timer this is our
[11:43] input file
[11:44] up to 50 seconds starting from the
[11:46] beginning up to 50 seconds 0 to 50 slow
[11:49] dot MP4 our output we want as MP4
[11:52] now if I were to run this
[11:55] so we are getting some output but it is
[11:57] asking me if I want to override this
[11:59] file I can do a y here
[12:03] okay so as you can see that this is
[12:05] approximately going at 1X the speed so
[12:07] it will still take me around 50 seconds
[12:09] 50 to 40 seconds
[12:13] you can see how much time has been
[12:14] completed right here
[12:22] so just a few more seconds to go
[12:26] so as you can see that there is much
[12:28] less output this time
[12:32] and if you were to set this log level to
[12:34] panic then there will be almost be no
[12:37] output however I still recommend you put
[12:39] it as log level info uh so this is done
[12:42] as you could see this still took some
[12:44] time and if we do the fast version how
[12:47] do we do the fast version by simply
[12:49] appending a minus C copy okay if we do
[12:52] that we can change this to fast okay but
[12:56] again the issue is of accuracy so and we
[13:00] are done okay we are done already so
[13:02] again if we check those out
[13:05] so so this time it was so this time the
[13:09] command that we ran was uh 0 to 50 fast
[13:13] and 0 to 50 slow so if I were to run if
[13:16] I were to run 0 to 50 slow
[13:19] so as you can see that began exactly at
[13:22] zero let me just pause it
[13:24] okay so it began exactly at zero and it
[13:28] will end
[13:30] it will end exactly at 50 or rather 49.
[13:34] it will end at 49 but if we were to run
[13:37] the 0 to 50 fast now it will begin at
[13:41] the right time because that is not where
[13:43] we have cut okay so it will begin at
[13:45] zero but it would end at a probably a
[13:49] different time so 49 50 okay so this one
[13:53] it did go up to 50 but the previous one
[13:55] went up to 49 and that was a bit more
[13:59] accurate you will see
[14:00] so it stopped at 49.
[14:03] so if accuracy is not a concern if a
[14:06] couple of seconds accuracy is not a
[14:08] console then you can go by the first one
[14:09] but if accuracy is important then you
[14:12] should go by the slow method now so this
[14:15] is when we have to remove some parts uh
[14:18] this is when we have to remove some
[14:19] parts of it let me just quickly copy it
[14:21] so 0 to 50 fast copy
[14:27] okay I'll just show this command to you
[14:29] this is the fast method okay and then of
[14:33] course we have the slow method as well
[14:34] slow but accurate
[14:39] so the slow method was something like
[14:41] this
[14:43] so the only difference between these two
[14:45] commands
[14:47] the only difference between these two
[14:49] commands is the dash C copy here okay
[14:52] now dash C copy uh what the what Dash C
[14:56] copy does it is it copies the entire
[14:58] video as it is okay without
[15:01] demoxing it without muxing demoxing or
[15:04] rather without encoding it encoding
[15:06] right now is not that important you
[15:08] could simply understand it is that it
[15:09] copies it as it is without any quality
[15:11] change this this method prevents any
[15:14] quality degradation
[15:16] so hide Banner login info this is just
[15:19] helpful in preventing too much output
[15:22] now so so in the first case we remove
[15:26] the first 10 seconds in the second case
[15:28] we removed the last 10 seconds now what
[15:30] if we want to keep only a portion in
[15:34] between okay that is let's say what if
[15:35] you want to keep or let's say you want
[15:38] to remove the first
[15:40] let's say five seconds
[15:43] and also remove
[15:45] and also remove last let's say 15
[15:49] seconds let's say 15 seconds okay now
[15:53] again since here we already know the
[15:54] video duration so if you are removing
[15:56] the first five seconds uh if you're
[15:59] removing the first five seconds then my
[16:01] actual video is starting at five seconds
[16:03] and it is going up to if you are
[16:04] removing the last 15 seconds as well it
[16:06] is going up to 45 seconds okay
[16:09] now so there are two things there are
[16:12] two ways in which we could have achieved
[16:14] there are two ways in which we can
[16:15] achieve this basically everybody is
[16:17] going to start with from Five Seconds up
[16:18] to 45 seconds now there are two ways in
[16:21] which we can do this the first way is
[16:23] ffmpeg
[16:25] minus uh height Banner
[16:27] okay
[16:30] log level
[16:31] info this is just again to suppress the
[16:34] output uh log level info minus I is one
[16:38] minute timer okay this is this is the
[16:40] same input file
[16:42] now so there are two ways to do this
[16:45] I'll show you both of the ways now the
[16:47] first way uh now the first way is
[16:49] obviously when are we starting from and
[16:52] to put a filter on timer on the starting
[16:55] point we use minus SS okay now since you
[16:57] want to start from five seconds so we'll
[16:59] put the SS as five
[17:02] okay now uh since we want to end the
[17:05] video at 45 seconds okay we want to end
[17:08] the video at 45 seconds there are two
[17:10] ways in which you can do this the first
[17:11] way is by specifying the end point the
[17:15] other way is by specifying the duration
[17:17] okay now what does the end point and
[17:20] duration mean very simply
[17:24] so if my video is running from 5 Seconds
[17:27] to 45 seconds the duration
[17:30] is going to be 40 seconds okay the end
[17:33] point is 45 seconds but the duration is
[17:35] 40 seconds so when we use minus t here
[17:38] it implies the duration okay from 5
[17:42] Seconds to how much longer do we want
[17:44] the video to go on so we want an extra
[17:46] 40 seconds because from 5 Seconds up to
[17:49] 45 seconds deduction has to be 40
[17:50] seconds so we want the video to go an
[17:52] extra 40 seconds this is Method number
[17:54] one okay it will give you the same
[17:55] result and let's say let's let's just go
[17:58] by the slow method in this case it's not
[17:59] in and it's not a very large video
[18:01] anyways uh we'll do uh five to forty
[18:06] rather 5 to 45
[18:08] to 45 T dot MP4 obviously this is a
[18:13] slower method
[18:15] okay it's going to take some time
[18:21] so the important thing here is we took
[18:23] the duration here okay we took the
[18:25] duration here so it started from Five
[18:28] Seconds went up to 40 seconds more so a
[18:32] total of 45 seconds we will also check
[18:34] out the output as well
[18:39] foreign
[18:43] so we have completed 37 seconds
[18:46] all right so done so if we were to play
[18:49] that file uh let's say uh so this was 5
[18:52] to 45 right so 5 to 45 now see it begins
[18:57] at five seconds
[18:59] it begins at five seconds it's a 40
[19:03] second video and the end point would be
[19:05] at 45 this is at 43 it there's still
[19:07] some time so if I play it so if I were
[19:10] to play it it would end at 44 okay
[19:13] because again it it does not go up to 45
[19:15] so this is when we use the duration okay
[19:19] that is here the duration was 40 seconds
[19:20] but what if we want to specify the end
[19:22] point if you want to specify the end
[19:24] point so in that case we simply use t o
[19:28] in that case we use t o and now our
[19:31] endpoint is up to 45th second okay so
[19:33] this goes on from the five second of the
[19:35] original video to the 45th second of the
[19:39] uh to the 45th second of the original
[19:41] video now here I'm going to use t o okay
[19:45] and if we go do that again now this is
[19:48] obviously again I'm using the slow
[19:49] method the fast method would be slightly
[19:51] inaccurate
[19:53] if you want to use a fast method just
[19:55] put a dash C copy right before the
[19:57] output file I'll show an example as well
[20:07] so this is done up so 29 seconds have
[20:11] been done we are only going up to 45
[20:17] Okay so
[20:19] this is the one that we did right now
[20:23] so as you can see this also began at
[20:25] five seconds this also began at five
[20:27] seconds and it would end at 44 seconds
[20:30] okay this is almost at the end point it
[20:32] would end at 44 seconds essentially 45
[20:34] seconds
[20:36] now so both of these do exactly the same
[20:40] thing but the difference between t and t
[20:42] o okay let me just copy the commands
[20:47] so
[20:52] so the first let's look at the T command
[20:56] so in case of T command we specified the
[21:00] duration
[21:03] okay and in case of the
[21:06] T O command we specified the end point
[21:15] okay so I think we should I should
[21:18] so the difference here was that we gave
[21:20] the duration from five seconds and the
[21:22] next 40 seconds after the fifth second
[21:24] and from here we mentioned the starting
[21:26] point and the end point
[21:29] okay now uh
[21:32] I guess this is it for this video so you
[21:34] could have you could have removed from
[21:36] the beginning you could have removed
[21:37] from the end or you could have removed
[21:39] from the beginning and the end as well
[21:42] okay so you can use any of these
[21:43] commands obviously yes to make it faster
[21:45] all you had to do was add a minus C
[21:49] copy right here okay doing this would
[21:51] have made the video go fast it would
[21:53] have been slightly inaccurate but
[21:54] Twitter Made It Go much faster okay so
[21:56] that's it for this video we will
[21:58] continue we will discuss more details or
[22:00] we'll discuss more uh commands right in
[22:03] the next video that's it
[22:06] all right so in this video we'll just
[22:08] check out one more uh one more way to to
[22:11] put the timers uh to put the timers when
[22:14] you want to trim parts of a video
[22:16] so in our last case when we wanted so in
[22:18] our last video when we wanted to trim
[22:20] out let's say the first 10 seconds you
[22:22] wanted to remove the first 10 seconds
[22:23] the command that we used was ss10 okay
[22:27] now 10 by itself means seconds here but
[22:31] uh our video obviously was a one minute
[22:32] video but what if it was not a one
[22:34] minute video what if it was it was let's
[22:36] say a 15 Minutes video or let's say it
[22:37] was a two hour video in that case how do
[22:40] we specify the time interval very simply
[22:43] um in that case what you would have done
[22:45] is ffmpeg minus uh minus minus
[22:50] ffmpeg minus I uh you have to specify
[22:53] the input file here let's say the input
[22:54] file is same one minute timer okay uh
[22:57] let's say starting at now how do we
[23:00] specify hours minutes and seconds so
[23:02] let's say 0 0 uh zero zero and let's say
[23:05] 20 okay so what this means here is hours
[23:09] minutes and seconds okay so if you have
[23:13] a long enough video you can use this
[23:14] method as well so basically this
[23:16] represents HH mm and SS obviously the
[23:20] accuracy is also up to milliseconds but
[23:23] I have never had to use that actually so
[23:25] uh so you can use this convention as
[23:27] well now of course you could have used
[23:29] the same thing for time duration or end
[23:32] point as well now if we were to use
[23:35] let's say minus 2 here okay if we were
[23:38] to use a two flag here that would imply
[23:40] the end point okay that would imply the
[23:43] end point what does that mean
[23:45] so let's say if if I want to keep let's
[23:48] say if I want to keep from let's say if
[23:50] I want to keep the let's say if I want
[23:52] to start the video from the 20th second
[23:55] up to let's say for let's say 55 seconds
[23:59] okay from the 20th second up to 55th
[24:02] second
[24:04] okay so in that case how would I have
[24:06] specified it 20 seconds up to zero zero
[24:09] zero zero so hours minutes and seconds
[24:12] that is 55 seconds let me do the let me
[24:15] just let's go by the first method here
[24:17] uh let's say 20 to 55
[24:21] 2 dot MP4 of course there's going to be
[24:25] a lot of output in this particular case
[24:27] because I have not used hide Banner or
[24:29] log level let's just still then check it
[24:31] out anyways so if I do this here let me
[24:34] just check if the yeah start timer 20
[24:36] and timer is 55 all right so this is
[24:38] from 20 seconds up to 55 seconds if I do
[24:42] an okay so as you could see that we saw
[24:44] all of this output then there is
[24:45] something going on here
[24:47] so the speed is still 0.7 but this is
[24:51] not a very long video
[24:53] foreign
[24:57] that we started the video from 20
[25:00] seconds here okay but it is showing 20
[25:03] but a few seconds back it showed 15
[25:06] seconds or 10 seconds uh now in this
[25:08] case we have to understand that when you
[25:09] do SS the timing of the video resets
[25:12] okay the timing of the video resets that
[25:14] is now 20 seconds will be counted as the
[25:17] beginning of the video okay or 20
[25:19] seconds will be counted as zero okay so
[25:23] so if I were to check this one out so I
[25:25] named this 20 to 55 20 to 55 here we are
[25:31] okay this is 2 using the duration
[25:35] so as you can see that this began at 20
[25:39] seconds okay as you can see that this
[25:40] began at 20 seconds and it's a 35 second
[25:43] video so if you go up to the end it will
[25:45] end at 54. okay and at 54. okay now uh
[25:49] because I've also done the duration one
[25:51] as well now if you wanted to go by the
[25:53] duration so for the duration part now if
[25:58] you are going from 20 to 55 the duration
[26:02] the duration of the video or how long
[26:04] the video would have been is 35 seconds
[26:07] okay so at that case when we are using
[26:10] the T flag or the duration flag it we
[26:13] would have used
[26:15] 30 seconds sorry not 30 seconds 35
[26:17] seconds okay from 20 seconds and the
[26:20] next 35 seconds so 22 so 22 55 t
[26:25] uh of course we will surprise all the
[26:27] output Okay so
[26:31] hide Banner
[26:34] and hide underscore Banner
[26:37] okay and then we have log
[26:41] level info okay so info gives you some
[26:44] information at the very least
[26:47] okay so info gives you some information
[26:49] whereas if I had written Panic here
[26:53] Panic then it would have given us no
[26:54] information the file would have simply
[26:56] completed
[26:58] okay so as you can see it began
[26:59] somewhere 13 seconds that is because the
[27:01] start timer has now been reset
[27:06] so obviously it will be a 35 second
[27:07] video so it will go only up to 35 it
[27:10] will end much before that actually
[27:15] so as you can see it ended right before
[27:17] it hit 35 so if we open up the other
[27:20] file 25 to 55 t Okay so as you can see
[27:26] that
[27:29] it begins
[27:32] that it begins
[27:35] it begins at 20 okay because we wanted
[27:37] to start the video at 20 and it will end
[27:39] again at 54 it's a 35 second video it
[27:41] will end at 54. okay it's at the end
[27:48] so I guess that's it for this video
[27:55] all right so in this video we are going
[27:56] to learn how to convert from one format
[27:58] to another for example some of you may
[28:01] have some videos which are in the MP4
[28:03] format or maybe uh for example you may
[28:06] have some videos which are in the MP4
[28:07] format or you may have some videos which
[28:09] are in the Avi format or they could be
[28:11] in MKV format now how do you inter
[28:13] convert those into each other very very
[28:16] fast okay without any quality loss or or
[28:20] without taking this or without it taking
[28:22] up too much of your time it's very
[28:23] simple
[28:25] so again we will take the example of the
[28:26] one minute timer MP4 and we'll try to
[28:28] convert this to MKV this is very very
[28:31] simple so ffmpeg as usual minus I minus
[28:35] I tells you uh the input file so we'll
[28:37] take one minute one minute timer so this
[28:40] is our input file now we want to let's
[28:41] say convert this into an MKV file as it
[28:44] is without any changes we want to
[28:46] convert this the entire file into an MKV
[28:48] file very fast so minus C copy okay then
[28:52] whatever name you want to put it let's
[28:54] say
[28:55] MP4 to MKV dot MKV okay that is all that
[29:00] you have to do you have to Simply put a
[29:02] minus C copy here and then whatever
[29:04] format you want it right here of course
[29:06] this will give a lot of output so I just
[29:08] will decrease that so hide Banner
[29:12] okay and log level
[29:16] log level info okay so that's it and as
[29:21] you'll see this will be done very very
[29:23] quickly so
[29:24] and it's done already okay it's done
[29:26] already so if I were to play this file
[29:28] there is the MKV format right here so if
[29:31] I were to play this as you can see this
[29:33] is now an MKV file okay there is zero
[29:35] quality loss and it begins and
[29:39] and it begins at
[29:43] it begins at zero okay as you can see
[29:46] here and it is a one minute file ending
[29:48] at 59 okay you can see it will end at
[29:50] 59.
[29:52] okay so so you can use you can use this
[29:56] script to convert an entire directory of
[29:58] files uh so I'll just copy down this one
[30:03] so you can use this script to convert an
[30:06] entire directory of files of course you
[30:08] could have used you could have used this
[30:10] to convert from mkb to MP4 in that case
[30:12] this footage just have been an MKV this
[30:14] would have been an mp4 now so what if
[30:17] you have an entire directory of files
[30:21] okay what if you have an entire
[30:22] directory or files now for that we can
[30:24] use a loop okay for that you can use a
[30:27] loop now so the format of a loop looks
[30:30] something like this for let's say let's
[30:33] say you have a directory full of MP4
[30:35] files uh let's say that you have a
[30:37] directory full of MP4 files and you want
[30:39] to convert them into MKV files let's say
[30:42] you have a movies folder all of MP4 and
[30:45] you want to convert that to MKV so how
[30:47] do you do that you simply run a loop now
[30:48] how do we write Loops in bash so I'm
[30:52] first of all going to write it right
[30:53] here then I'm going to copy that there
[30:55] so the way you write Loop looks
[30:57] something like this for f in whatever
[31:00] the format is let's say you have all of
[31:02] them in MP4 like I have it here okay for
[31:07] f in dollar MP4 do okay so do gives you
[31:11] uh do tells the command prompt on to
[31:15] what what does it have to do what does
[31:16] it have to do you have to run the ffmp
[31:17] command so ffmpeg minus side Banner you
[31:20] could use this you could emit this
[31:22] entirely up to you hide underscore
[31:24] Banner
[31:27] minus log
[31:30] level info okay minus I now my input
[31:34] file is going to be this F command here
[31:38] why because if I were to write an LS
[31:40] here okay I have this MP4 I have this
[31:45] MP4 okay so for one point F will be this
[31:50] the other point F would be this one okay
[31:52] so uh
[31:55] so F in Star MP4 yaniki means that this
[31:58] will convert these two files do FFM back
[32:01] hide by log level info one dollar F okay
[32:04] so dollar f means whatever file it is
[32:07] handling right now okay whatever file it
[32:09] is handling right now
[32:11] what do we want to do is we want to
[32:13] convert this into MKV so minus C copy uh
[32:18] into MKV now how do we do that we'll
[32:21] have to use some string manipulation if
[32:23] you're not familiar with string
[32:25] manipulation I suggest you read up on
[32:26] that so how do we manipulate the string
[32:29] here we use same thing double quotation
[32:31] here uh dollar bracket open F star
[32:36] percent okay so this means whatever is
[32:40] after the last uh whatever is after the
[32:43] last dot okay for example if I were to
[32:45] look here after the last dot we have MP4
[32:48] here okay so instead of the last dot we
[32:50] want it to be m k v here okay now this
[32:54] basically let's let's put a converted
[32:57] here
[32:58] let's put a converted word here okay to
[33:00] MKV so essentially what it does here is
[33:03] this is obviously our output file this
[33:05] is our output file
[33:08] what it is doing here is that it will
[33:10] keep the same name okay it will keep the
[33:14] same name but whatever is after this dot
[33:16] that is MP4 this part gets removed and
[33:19] it will add a dash converted MKV okay so
[33:22] let's run this command then you will get
[33:24] it so anyways we are inside a loop so do
[33:26] ffmpeg and then we will add a done okay
[33:28] so this means that now our Command is
[33:30] complete so if I were to copy this
[33:33] command
[33:34] and paste it right here I have not yet
[33:35] run it so I'll just show it to you once
[33:37] again so for f in dollar MP4 okay so
[33:41] sorry dollar so for f in Star MP4 star
[33:44] dot MP4 means all of the files that end
[33:45] in MP4 so MP4 here MP4 here these two
[33:48] obviously do not end in MP4 I mean this
[33:50] is an MKV so it is not going to get
[33:52] lifted it is not going to get listed do
[33:55] it tells it is asking for the command
[33:57] that you want to run so ffmpeg hide when
[33:59] our log level info whatever this is just
[34:00] to reduce the output minus I dollar F so
[34:03] input file is whatever the f is at that
[34:05] point of time minus C copy uh so that
[34:08] the the process goes very fast and there
[34:11] is absolutely no loss quality loss here
[34:14] so star F star percentage converted to
[34:18] MKV okay I want to convert this from MP4
[34:21] we started from MP4 we wanted to MKV
[34:23] with the same name and done so if I if I
[34:26] were to run this
[34:28] bad substitution what did I make where
[34:31] did I make a mistake here
[34:32] uh did I do a percentage and that error
[34:36] here probably that is what I did do done
[34:39] I probably messed this up right here
[34:46] yeah so I messed that up so as you can
[34:48] see we are already done okay we are
[34:50] already done so if I were to if I were
[34:54] to show you the so as you can see here
[34:57] so one minute timer has converted to one
[35:00] minute hyphen converted MKV this is just
[35:03] for understanding and your one minute
[35:05] video has converted to one minute
[35:07] converted MKV everything else remains
[35:09] exactly the same the size is exactly the
[35:10] same the duration would also be exactly
[35:12] for example if I were to run this
[35:15] so one minute timer
[35:19] so
[35:21] starts at zero
[35:23] ends at 59 and one minute timer MKV
[35:26] converted okay exact same thing it would
[35:32] start at zero
[35:34] end at 59 okay the format has been
[35:36] changed okay so you can use this to
[35:38] convert entire directories of movies or
[35:40] or videos from One format to the other
[35:42] very quickly without any change in
[35:45] quality I guess that's it for this video
[35:46] I'll see you