I download from YT and typically get a number of files. Probably an mp4, a webm and a mkv.
And I get weirdly named files like name.f244.webm or name.webm.f137 or name.webm.mkv or name.mp4.f251 - like that.
Often only one of these will have sound - usually the mkv - when I play them in VLC.
Or even when played in anything else. Though I don't check much. I want things working in VLC.
I've been trying to find some way to 'rescue' the sound in the mp4 files, assuming it is there.
It was suggested to me that simply recoding them would fix it.
And I've been trying to find a way to play the mkv's and mp4's, with or without sound, on our t.v. which will only accept .avi Well, sometimes. There are some mp4 it will play but others it claims are unrecognised media or unsupported or something - that's part of my ignorance, I think I need to know how to discover which 'kind' of mp4 it doesn't like.
So I've tried Handbrake and Freemake Video Converter and most recently Xmedia Recode. Hoping to do both things.
Well xmedia has created a playable avi alright though it seems to have destroyed the resolution somewhat - but it hasn't fixed the audio thing.
So I realise I'm working in the dark. Just blundering around.
I need a bit of a crash course in video file analysis for the purpose of ascertaining what codecs have been used and what procedures now can be/should be used to get certain results. Perhaps. At a guess.
Some way to look at the files I've got, what they're made of and what I could/should do with them.
Would that be possible? Can anyone help me with that ? Is that a reasonable goal?
p.s. Yes, I know I can see details of a file in xmedia (just found it out actually) but the point is that currently that info presented is fairly meaningless to me. All I notice is the info on this last file doesn't seem to mention audio at all. So does that mean it simply has none? Was recorded without any?
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Last edited by abrogard; 10th Oct 2018 at 18:15.
Many of the files are only audio or only video. A random youtube video for example:
>youtube-dl -F https://www.youtube.com/watch?v=4c4ui_TlGws [youtube] 4c4ui_TlGws: Downloading webpage [youtube] 4c4ui_TlGws: Downloading video info webpage [info] Available formats for 4c4ui_TlGws: format code extension resolution note 249 webm audio only DASH audio 51k , opus @ 50k, 5.13MiB 250 webm audio only DASH audio 64k , opus @ 70k, 6.40MiB 171 webm audio only DASH audio 100k , vorbis@128k, 10.39MiB 251 webm audio only DASH audio 116k , opus @160k, 11.64MiB 140 m4a audio only DASH audio 131k , m4a_dash container, mp4a.40.2@128k, 14.25MiB 160 mp4 256x144 144p 57k , avc1.4d400c, 25fps, video only, 4.01MiB 133 mp4 426x240 240p 100k , avc1.4d4015, 25fps, video only, 7.07MiB 278 webm 256x144 144p 105k , webm container, vp9, 25fps, video only, 9.78MiB 242 webm 426x240 240p 163k , vp9, 25fps, video only, 10.54MiB 134 mp4 640x360 360p 177k , avc1.4d401e, 25fps, video only, 13.39MiB 243 webm 640x360 360p 280k , vp9, 25fps, video only, 16.39MiB 135 mp4 854x480 480p 283k , avc1.4d401e, 25fps, video only, 21.63MiB 244 webm 854x480 480p 445k , vp9, 25fps, video only, 23.40MiB 136 mp4 1280x720 720p 481k , avc1.4d401f, 25fps, video only, 34.86MiB 247 webm 1280x720 720p 789k , vp9, 25fps, video only, 37.84MiB 137 mp4 1920x1080 1080p 881k , avc1.640028, 25fps, video only, 61.92MiB 248 webm 1920x1080 1080p 1318k , vp9, 25fps, video only, 61.02MiB 17 3gp 176x144 small , mp4v.20.3, mp4a.40.2@ 24k, 8.83MiB 36 3gp 320x180 small , mp4v.20.3, mp4a.40.2, 24.70MiB 18 mp4 640x360 medium , avc1.42001E, mp4a.40.2@ 96k, 39.64MiB 43 webm 640x360 medium , vp8.0, vorbis@128k, 55.86MiB 22 mp4 1280x720 hd720 , avc1.64001F, mp4a.40.2@192k (best)
that's very interesting. how did you get that download?
can i get that?
and what's the point of so many files?
if I upload to youtube will it somehow create all those files from my simple upload?
and how do downloading progs know which files to get?
do they have to get one of each (vid and audio) and combine them?
thanks for that.
and that doesn't cover all of them either does it? all those subtitle files....
A very good link. Thanks for that.
Seems perhaps I've made a mountain out of a molehill. Thought I needed to understand much about the internal composition of these video files and the codecs used to produce them in order to know how to massage them into a form that, for instance, my t.v. would play properly.
But it turns out that most of these files simply have no audio is the main problem. And others are unsupported types.
And I just need any simple tool to look at them and see if they've got audio or not and I could I suppose add audio in if there's no other option but first I should just make sure there's not a 'good' file in the download somewhere.
I don't really need to know any more than that, do I? Might like to. But don't need.
Given the names of your files (name.f244.webm, name.webm.f137) I suspect you can use the names as a guide. Note the corresponding numbers in the youtube-dl list I posted:
244 webm 854x480 480p 445k , vp9, 25fps, video only, 23.40MiB 137 mp4 1920x1080 1080p 881k , avc1.640028, 25fps, video only, 61.92MiB
That's a very good clue, thanks.
ffmpeg.exe into the youtube-dl folder it will automatically combine video and audio into a single file.
https://github.com/rg3/youtube-dl/blob/master/README.md#format-selection (see examples)
The documentation really covers everything.