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Default settings do not download best quality video from YouTube #8749

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FrostedMint opened this issue Mar 4, 2016 · 2 comments
Closed

Default settings do not download best quality video from YouTube #8749

FrostedMint opened this issue Mar 4, 2016 · 2 comments

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@FrostedMint
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@FrostedMint FrostedMint commented Mar 4, 2016

It appears that the default quality settings are not always grabbing the best possible video from YouTube.

Here is a selection of formats reported using -F for this music video:

251          webm       audio only DASH audio  165k , opus @160k, 4.74MiB
136          mp4        1280x720   720p 2218k , avc1.4d401f, 30fps, video only, 63.58MiB
247          webm       1280x720   720p 2382k , vp9, 30fps, video only, 46.77MiB
22           mp4        1280x720   hd720 , avc1.64001F,  mp4a.40.2@192k (best)

And here is what actually gets downloaded and muxed:

Format Container Size Video Audio
247+251 WebM 52 MB VP9 @ 1454 Kbps Opus @ 154 Kbps
136+251 Matroska 69 MB AVC1 @ ~2060 Kbps Opus @ 154 Kbps
22 MP4 88 MB AVC1 @ 2663 Kbps AAC @ 192 Kbps

I would expect 22 to be the best possible format, and 136+251 to be the best possible DASH format. Instead, I get 247+251.

I'm using MediaInfo on OS X to determine the bitrates.

Here's the full output of youtube-dl:

$ uname -v
Darwin Kernel Version 15.3.0: Thu Dec 10 18:40:58 PST 2015; root:xnu-3248.30.4~1/RELEASE_X86_64

$ youtube-dl -U
youtube-dl is up-to-date (2016.03.01)

$ export VIDEO=https://www.youtube.com/watch?v=keeYY_5XR4w

$ youtube-dl --ignore-config -vF $VIDEO
[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'--ignore-config', u'-vF', u'https://www.youtube.com/watch?v=keeYY_5XR4w']
[debug] Encodings: locale UTF-8, fs utf-8, out None, pref UTF-8
[debug] youtube-dl version 2016.03.01
[debug] Python version 2.7.10 - Darwin-15.3.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 3.0, ffprobe 3.0, rtmpdump 2.4
[debug] Proxy map: {}
[youtube] keeYY_5XR4w: Downloading webpage
[youtube] keeYY_5XR4w: Downloading video info webpage
[youtube] keeYY_5XR4w: Extracting video information
[youtube] {22} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {43} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {18} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {5} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {36} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {17} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {136} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {247} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {135} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {244} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {134} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {243} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {133} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {242} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {160} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {278} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {140} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {171} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {249} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {250} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {251} signature length 40.44, html5 player en_US-vfl_cdzrt
[info] Available formats for keeYY_5XR4w:
format code  extension  resolution note
249          webm       audio only DASH audio   50k , opus @ 50k, 1.47MiB
250          webm       audio only DASH audio   67k , opus @ 70k, 1.91MiB
140          m4a        audio only DASH audio  128k , m4a_dash container, mp4a.40.2@128k, 3.91MiB
171          webm       audio only DASH audio  137k , vorbis@128k, 3.93MiB
251          webm       audio only DASH audio  165k , opus @160k, 4.74MiB
278          webm       256x144    144p   96k , webm container, vp9, 15fps, video only, 2.55MiB
160          mp4        256x144    144p  117k , avc1.42c00c, 15fps, video only, 3.43MiB
242          webm       426x240    240p  257k , vp9, 30fps, video only, 5.97MiB
133          mp4        426x240    240p  262k , avc1.4d4015, 30fps, video only, 7.53MiB
243          webm       640x360    360p  496k , vp9, 30fps, video only, 11.06MiB
134          mp4        640x360    360p  607k , avc1.4d401e, 30fps, video only, 16.49MiB
244          webm       854x480    480p  988k , vp9, 30fps, video only, 20.34MiB
135          mp4        854x480    480p 1110k , avc1.4d401f, 30fps, video only, 31.62MiB
136          mp4        1280x720   720p 2218k , avc1.4d401f, 30fps, video only, 63.58MiB
247          webm       1280x720   720p 2382k , vp9, 30fps, video only, 46.77MiB
36           3gp        320x?      small , mp4v.20.3,  mp4a.40.2
17           3gp        176x144    small , mp4v.20.3,  mp4a.40.2@ 24k
5            flv        400x240    small , h263, mp3  @ 64k
43           webm       640x360    medium , vp8.0,  vorbis@128k
18           mp4        640x360    medium , avc1.42001E,  mp4a.40.2@ 96k
22           mp4        1280x720   hd720 , avc1.64001F,  mp4a.40.2@192k (best)

$ youtube-dl --ignore-config -v $VIDEO
[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'--ignore-config', u'-v', u'https://www.youtube.com/watch?v=keeYY_5XR4w']
[debug] Encodings: locale UTF-8, fs utf-8, out None, pref UTF-8
[debug] youtube-dl version 2016.03.01
[debug] Python version 2.7.10 - Darwin-15.3.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 3.0, ffprobe 3.0, rtmpdump 2.4
[debug] Proxy map: {}
[youtube] keeYY_5XR4w: Downloading webpage
[youtube] keeYY_5XR4w: Downloading video info webpage
[youtube] keeYY_5XR4w: Extracting video information
[youtube] {22} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {43} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {18} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {5} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {36} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {17} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {136} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {247} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {135} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {244} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {134} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {243} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {133} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {242} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {160} signature length 38.44, html5 player en_US-vfl_cdzrt
[youtube] keeYY_5XR4w: Downloading player https://s.ytimg.com/yts/jsbin/player-en_US-vfl_cdzrt/base.js
[youtube] {278} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {140} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {171} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {249} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {250} signature length 40.44, html5 player en_US-vfl_cdzrt
[youtube] {251} signature length 40.44, html5 player en_US-vfl_cdzrt
[debug] Invoking downloader on u'https://r19---sn-nx57yn7s.googlevideo.com/videoplayback?sver=3&lmt=1425168130099374&ipbits=0&itag=247&key=yt6&mime=video%2Fwebm&expire=1457085346&mn=sn-nx57yn7s&mm=31&upn=3_RNUWvTAfI&ms=au&mv=m&mt=1457063667&ip=216.243.6.134&fexp=9415516%2C9416126%2C9418183%2C9420052%2C9420452%2C9422596%2C9423038%2C9423661%2C9423662%2C9424416%2C9425398%2C9428063%2C9428247%2C9428329%2C9428559%2C9428965%2C9429693%2C9430989&sparams=clen%2Cdur%2Cgcr%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cnh%2Cpl%2Crequiressl%2Csource%2Cupn%2Cexpire&keepalive=yes&id=o-AJt0o0a7Uh5-603hE-nngo2BRkWoCFTIKdbMEXlMF_1u&clen=49037308&requiressl=yes&gir=yes&nh=IgpwcjAxLnNlYTAzKgkxMjcuMC4wLjE&pl=22&initcwndbps=4033750&dur=257.824&gcr=us&source=youtube&signature=1BF6FA409837EE061CB4BA964E10E6D30FD50543.B67F7DF27BE51D76480494962EA40EA1E9CAC2F2&ratebypass=yes'
[download] Destination: 【ポリリズム】Perfume×capsule【Sound of Silence】-keeYY_5XR4w.f247.webm
[download] 100% of 46.77MiB in 00:02
[debug] Invoking downloader on u'https://r19---sn-nx57yn7s.googlevideo.com/videoplayback?sver=3&lmt=1425167994422249&ipbits=0&itag=251&key=yt6&mime=audio%2Fwebm&expire=1457085346&mn=sn-nx57yn7s&mm=31&upn=3_RNUWvTAfI&ms=au&mv=m&mt=1457063667&ip=216.243.6.134&fexp=9415516%2C9416126%2C9418183%2C9420052%2C9420452%2C9422596%2C9423038%2C9423661%2C9423662%2C9424416%2C9425398%2C9428063%2C9428247%2C9428329%2C9428559%2C9428965%2C9429693%2C9430989&sparams=clen%2Cdur%2Cgcr%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cnh%2Cpl%2Crequiressl%2Csource%2Cupn%2Cexpire&keepalive=yes&id=o-AJt0o0a7Uh5-603hE-nngo2BRkWoCFTIKdbMEXlMF_1u&clen=4970110&requiressl=yes&gir=yes&nh=IgpwcjAxLnNlYTAzKgkxMjcuMC4wLjE&pl=22&initcwndbps=4033750&dur=257.861&gcr=us&source=youtube&signature=B596A2E8254CEDE00DCC35EFC9F1F1CFB102D0CA.8FE4FA58EAC2FCE4FAE5865E5B376C4642AEC648&ratebypass=yes'
[download] Destination: 【ポリリズム】Perfume×capsule【Sound of Silence】-keeYY_5XR4w.f251.webm
[download] 100% of 4.74MiB in 00:00
[ffmpeg] Merging formats into "【ポリリズム】Perfume×capsule【Sound of Silence】-keeYY_5XR4w.webm"
[debug] ffmpeg command line: ffmpeg -y -i 'file:【ポリリズム】Perfume×capsule【Sound of Silence】-keeYY_5XR4w.f247.webm' -i 'file:【ポリリズム】Perfume×capsule【Sound of Silence】-keeYY_5XR4w.f251.webm' -c copy -map 0:v:0 -map 1:a:0 'file:【ポリリズム】Perfume×capsule【Sound of Silence】-keeYY_5XR4w.temp.webm'
Deleting original file 【ポリリズム】Perfume×capsule【Sound of Silence】-keeYY_5XR4w.f247.webm (pass -k to keep)
Deleting original file 【ポリリズム】Perfume×capsule【Sound of Silence】-keeYY_5XR4w.f251.webm (pass -k to keep)
@FrostedMint FrostedMint changed the title Not always grabbing "best" quality video on YouTube Default settings do not download best quality video from YouTube Mar 4, 2016
@FrostedMint
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@FrostedMint FrostedMint commented Mar 4, 2016

So, one source suggests encoding an x264 video at a quality equivalent to a VP9 video requires about 49% more bitrate. An x264 video stream equivalent to a VP9 video stream at 1454 Kbps would require about ~2166 Kbps, slightly above the actual x264 bitrate of ~2060 Kbps.

Perhaps this explains why -F incorrectly reports the bitrate of the VP9 stream as 2382k (actually 1454 Kbps); compared to the x264 stream, which is reported as having a lower bitrate (2218k) but a 35% larger file.

Even so, isn't the best option still to grab format 22?
@dstftw
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@dstftw dstftw commented Mar 4, 2016

Bitrate for f22 is not known beforehand. Other formats' bitrates are taken from metadata.
@dstftw dstftw closed this Mar 4, 2016
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