[0:00] hello i'm denchi and in today's video
[0:02] i'm going to be showing you how to use
[0:04] ffmpeg with some basic examples so i'll
[0:06] just get rid of a bunch of files here
[0:08] real quick
[0:09] and just pretend i only have one file
[0:11] here outro.mp4 now if i double click on
[0:14] this and i play it back
[0:16] [Music]
[0:18] you'll notice just the outro from all my
[0:20] videos and
[0:21] yeah that's what i use is my outro let's
[0:23] say i want to convert it
[0:24] to an mkv for example well i have a
[0:27] program named
[0:28] ffmpeg and if you're running linux and
[0:30] you have a desktop environment installed
[0:32] this is already on your system including
[0:34] all the codecs that are going to need to
[0:36] do all the conversions
[0:38] so let's say i want to convert this file
[0:39] so i'm going to do ffmpeg-i
[0:42] outro so i means input and if i don't
[0:45] give it any
[0:45] any other parameters and just press
[0:47] enter it will give me information on the
[0:50] file
[0:50] so as you can see here it tells me that
[0:52] um stream00
[0:54] it's using the hevc encoder which is a
[0:57] modern functional
[0:58] encoder you 420p like pixel format
[1:01] it's at 1920 by 1080 in terms of
[1:03] resolution it's at 60fps
[1:05] and all of the stuff for audio it's
[1:06] using aac it's a 48
[1:09] 000 hertz sample rate stereo and 128
[1:13] kilobytes per second as the bit rate um
[1:15] so yeah all of that stuff
[1:17] now let's say i want to convert it to an
[1:18] mkv without
[1:20] any parameters fmpeg defaults to a bunch
[1:22] of stuff that it has pre-built in it
[1:24] i can just tell it to convert it to
[1:26] outro dot mk so it might take a little
[1:28] bit of time because this is
[1:30] a 20 second long video but eventually
[1:32] after i've done running this command so
[1:34] outro that mp4
[1:35] auto mkv just specifying i want it to go
[1:38] from this is my input to just this
[1:40] output
[1:40] i get an output and if i double click
[1:42] and play this
[1:45] you'll see it's it's pretty much the
[1:46] same thing now what if i want to specify
[1:48] a different encoder so
[1:50] this used h264 as the encoder because by
[1:53] default
[1:54] ffmpeg will try to use h64 when
[1:56] converting things to mkv
[1:58] let's say i want to use um h265 or hevc
[2:03] i can do dash c v
[2:07] and specify lib x265
[2:10] as my video codec same for audio if i
[2:13] want to use aac for example which is
[2:15] higher quality
[2:15] lossless audio i can do dash c colon a
[2:20] aac i can give them more options
[2:23] so for example i want to scale the video
[2:25] i can do dash
[2:26] s and like 1280 x 720
[2:30] that's 720p let's say i want to give it
[2:33] a rate i'll i'll keep this for now
[2:35] in the meantime before i talk about more
[2:37] options i'm going to quickly um
[2:40] run this and cancel it so i have it
[2:41] saved i'm going to talk about how to
[2:44] actually get the encoder list so
[2:46] you saw me write out lib x265 how do i
[2:48] know what all the encoders are well if
[2:50] you want to see all the encoders
[2:51] you do ffmpeg dash encoders
[2:54] and that will print them all out if i
[2:56] want all of those to go to like a file
[2:58] just do ffmpeg
[3:00] encoders and send them over to like i
[3:02] don't know
[3:02] [Music]
[3:04] encoders.txt so there you go
[3:06] and it will create encoders.txt you can
[3:08] look through these uh
[3:09] and there's all the encoders you can
[3:11] possibly use on a system
[3:12] now not all of these might work with
[3:14] your system maybe you don't have the
[3:15] hardware for some of the some of these
[3:17] or your processors too old or
[3:19] or maybe they're just not supporting
[3:20] enough that certain things downloaded or
[3:22] something like that
[3:22] but most of these should work and the
[3:25] reason all of these are here is because
[3:26] video comes in many variations so the
[3:28] one i use
[3:29] was let's see if i can spot it here we
[3:31] are uh lib
[3:33] x265 so this is s265 also known as hevc
[3:38] uh h264 this is the nvidia version but
[3:41] up here
[3:41] we got h64va api so that's the version
[3:44] for um video accelerated stuff
[3:47] um and then somewhere up there here we
[3:50] are you'll find
[3:50] libx 264 so that's h64 so that's the
[3:53] actual you know
[3:54] standard codec anyway but this isn't
[3:57] what's important now let's go back to
[3:58] where we were uh before i think i need
[4:00] to go
[4:00] uh wait a second you know open up the
[4:03] main toolbar
[4:04] and not maintain sorry uh settings uh
[4:07] show tabs go back to the previous file i
[4:09] was in
[4:10] this one anyway so back to what i was
[4:12] talking about before
[4:13] let's say i want to take i don't know
[4:16] let's just delete this file let's say i
[4:17] want to take
[4:18] outro that mp4 and convert it uh with
[4:21] what i was doing before
[4:23] uh this um i want to use aac as my audio
[4:26] codec
[4:27] x265 as my video codec basically the
[4:29] best ones out there pretty much
[4:31] and i want the resolution to be 720p
[4:34] let's say i want to
[4:35] change the audio rate so rate colon
[4:38] a and i give it something like 44
[4:42] 100 a common audio rate uh just
[4:45] give it a couple spaces so things are a
[4:46] little bit more evenly formatted here
[4:48] um spaces don't matter let's say i want
[4:50] to change the
[4:51] video bit rate dash b the one megabyte
[4:55] at most it can reach one megabyte per
[4:57] second
[4:57] most likely won't but if i really want
[4:59] to uh or let's say i want the audio
[5:01] bitrate to be something i can do
[5:03] dash b a and bitrate audio and set it to
[5:05] 192 kilo
[5:06] kilobytes per second or kilohertz no not
[5:09] killer it's kilobytes per second
[5:11] um now setting video like uh bitrates is
[5:14] pretty pointless when you're using
[5:15] something like x365 or h264 all that
[5:17] stuff because there's already an inbuilt
[5:19] utility for it it's called
[5:20] crf and it's much better it's uh very
[5:23] varying the bit rate
[5:24] uh based off a number you give it so the
[5:26] lower the number is
[5:27] the better the quality will be but the
[5:28] bigger the following follows
[5:30] so let's say i want it to be 24. 24 is a
[5:34] good number uh i
[5:35] most of my videos are you know 20 i set
[5:37] the crf rate to 24 when i compress them
[5:39] including this one it's 24. and um
[5:43] you know as you can see it looks pretty
[5:44] good if you need higher quality
[5:46] 20 but like it's pretty
[5:48] indistinguishable like a little bit
[5:49] maybe with more noisy video but you know
[5:52] for most video it's perfectly fine
[5:53] anyway moving on let's say i want to
[5:56] change the duration as well this video
[5:58] i can do dash ss to declare what i
[6:00] wanted to start i wanted to start at
[6:01] well zero hours zero minutes zero
[6:04] seconds
[6:05] and zero milliseconds and let's say i
[6:07] want it to end so dash
[6:08] t at zero hours zero minutes
[6:12] and zero five seconds and zero
[6:14] milliseconds
[6:15] i can also that's pretty much it no so
[6:18] i'm going to do after outside mp4 i'm
[6:19] going to use x265 i'm going to set my
[6:21] codec to aac for audio
[6:24] i'm going to scale it down to 720p
[6:26] change the audio bitrate to
[6:27] 44 100. i use crf 24 so you know pretty
[6:31] good quality for
[6:32] h.265 and stuff set my bitrate of audio
[6:35] to 192 kilobytes per second
[6:37] uh start the video at zero zero just the
[6:40] beginning of the video
[6:41] and end it at five seconds so let's
[6:42] press enter and let it work
[6:49] since it only had to do five seconds it
[6:50] was relatively quick and if we play this
[6:52] back
[6:56] as you can see it lasts five seconds
[6:58] it's in 720p and
[6:59] everything has been applied so ffmpeg is
[7:02] a really powerful tool when you want to
[7:03] mask convert files because you could
[7:04] just write a script and and mass convert
[7:06] every single mp4 file to
[7:08] a different format or every single mp4
[7:10] file compress it to something else or or
[7:12] something like that
[7:13] and let's say i want to take this
[7:15] outro.mp4 file
[7:16] and turn it into audio well that's the
[7:18] same concept dash i
[7:20] altered it before if i want to specify a
[7:22] specific audio codec i guess i don't
[7:23] know
[7:23] lib opus or something but i'm just going
[7:26] to say outro dot wav
[7:28] let's just turn it into a waff instantly
[7:30] done there you go australia double click
[7:32] that
[7:34] and as you can see it plays back because
[7:36] i've converted it to audio
[7:37] and here right before i end this video
[7:39] because i've talked about all the main
[7:40] options
[7:40] let's do a fun little experiment let's
[7:42] transform this outdoor.web and this
[7:44] image into a video
[7:45] so i'm going to take out that wav and
[7:48] essentially mix it with this image so
[7:49] i'm going to do ffmpeg
[7:51] dash i outro
[7:54] and then dash i image.png and i'm going
[7:58] to specify
[8:00] a specific codec so let's say i want
[8:03] libx265 relatively good the crf
[8:06] i don't know 20
[8:10] 20 20 is pretty good in terms of quality
[8:12] images are a little bit messed up when
[8:13] it comes to this kind of stuff
[8:15] and let's say i want um something like
[8:18] uh
[8:19] audio codecs okay i might want to
[8:21] specify a bitrate for audio though so
[8:23] i'm going to do b
[8:24] a and set it to 192 kilohertz so let's
[8:27] press enter on this
[8:29] and oh yeah i forgot to set an output
[8:31] file so wait a second i'm going to
[8:33] specify i want it to be
[8:34] outro image dot mp4 press
[8:37] enter and just let it convert there you
[8:38] go it's already done double click on
[8:40] this
[8:41] and as you can see it's the image with
[8:43] the audio it's just you know the image
[8:45] playing back in it and it has the audio
[8:47] from uh outro dot uh wove which is just
[8:50] you know just the raw
[8:51] 20 second audio and it mixes it with
[8:54] this image so if you've ever wanted to
[8:55] just have a still image
[8:56] and you're talking you can make that
[8:58] pretty easily in the file itself is
[9:00] negligible in terms of sizes it's
[9:01] minuscule it's 489 kilobytes so if you
[9:05] ever need to make a video where it's
[9:06] just like
[9:06] an image and that's all you can do that
[9:08] pretty easily with this
[9:10] so anyway thanks for watching my video
[9:11] on how to use you know ffmpeg with some
[9:13] basic options
[9:14] i'll have all a bunch of examples in the
[9:16] description if you want to take a look
[9:17] at them i'll just have this entire thing
[9:19] in the description actually
[9:20] um and yeah ffmpeg is a really useful
[9:23] tool i recommend if you're into video
[9:24] stuff
[9:25] you learn how to use it uh the best
[9:27] encoders for video
[9:28] are at the moment lib x265
[9:32] best encoder for audio is aac because
[9:34] high quality
[9:35] x265 is you know as long as you set your
[9:37] crf rate appropriately it's going to be
[9:39] perfectly fine in terms of quality
[9:40] might be a little slow because
[9:42] processors and stuff um if you need to
[9:44] deal with
[9:45] something like nvidia and coding you can
[9:47] do obviously what was it called um
[9:50] nvenk uh underscore hevc that's another
[9:54] codec you can use but it's it's or
[9:56] actually i think it's hebc underscore
[9:58] and bank
[9:59] and it's it's fast but it isn't as
[10:02] precise because
[10:03] gpus aren't like perfect like processors
[10:05] when it comes to video and
[10:06] the file sizes will be larger and it
[10:08] won't be as you know good
[10:09] it won't be as high quality video but
[10:11] yeah that's pretty much it
[10:13] thanks for watching my video goodbye
[10:25] [Music]
[10:35] you