youtube-dl download video and audio streams when ffmpeg or avconv isn't avalible

[mikhaelkh]

[debug] System config: []
[debug] User config: [u'--output', u'%(title)s.%(ext)s', u'--format', u'bestvideo[height<=?1080][ext=mp4]+bestaudio[ext=m4a]/bestvideo[height<=?1080][ext=webm]+bestaudio[ext=webm]/best[height<=?1080]']
[debug] Command-line args: [u'-v', u'https://www.youtube.com/watch?v=e-ORhEE9VVg']
[debug] Encodings: locale cp1251, fs mbcs, out None, pref cp1251
[debug] youtube-dl version 2016.02.13
[debug] Python version 2.7.10 - Windows-7-6.1.7601-SP1
[debug] exe versions: none
[debug] Proxy map: {}
[youtube] e-ORhEE9VVg: Downloading webpage
[youtube] e-ORhEE9VVg: Downloading video info webpage
[youtube] e-ORhEE9VVg: Extracting video information
[youtube] {22} signature length 40.41, html5 player en_US-vfldIygzk
[youtube] {43} signature length 40.41, html5 player en_US-vfldIygzk
[youtube] {18} signature length 40.41, html5 player en_US-vfldIygzk
[youtube] {5} signature length 40.41, html5 player en_US-vfldIygzk
[youtube] {36} signature length 40.41, html5 player en_US-vfldIygzk
[youtube] {17} signature length 40.41, html5 player en_US-vfldIygzk
[youtube] {137} signature length 40.41, html5 player en_US-vfldIygzk
[youtube] {248} signature length 40.41, html5 player en_US-vfldIygzk
[youtube] {136} signature length 40.41, html5 player en_US-vfldIygzk
[youtube] {247} signature length 40.41, html5 player en_US-vfldIygzk
[youtube] {135} signature length 40.41, html5 player en_US-vfldIygzk
[youtube] {244} signature length 40.41, html5 player en_US-vfldIygzk
[youtube] {134} signature length 40.41, html5 player en_US-vfldIygzk
[youtube] {243} signature length 40.41, html5 player en_US-vfldIygzk
[youtube] {133} signature length 40.41, html5 player en_US-vfldIygzk
[youtube] {242} signature length 40.41, html5 player en_US-vfldIygzk
[youtube] {160} signature length 40.41, html5 player en_US-vfldIygzk
[youtube] {278} signature length 40.41, html5 player en_US-vfldIygzk
[youtube] {140} signature length 40.41, html5 player en_US-vfldIygzk
[youtube] {171} signature length 40.41, html5 player en_US-vfldIygzk
[youtube] {249} signature length 40.41, html5 player en_US-vfldIygzk
[youtube] {250} signature length 40.41, html5 player en_US-vfldIygzk
[youtube] {251} signature length 40.41, html5 player en_US-vfldIygzk
WARNING: You have requested multiple formats but ffmpeg or avconv are not installed. The formats won't be merged.
[debug] Invoking downloader on u'https://r1---sn-n8t51nxg8pjx-2xne.googlevideo.com/videoplayback?ipbits=0&gir=yes&pcm2cms=yes&fexp=9405191%2C9407472%2C9408490%2C9412842%2C9416126%2C9420452%2C9422596%2C9423661%2C9423662%2C9423849%2C9425064%2C9425281%2C9427482%2C9427678%2C9428703&lmt=1417142360759732&mm=31&ip=212.109.6.214&mn=sn-n8t51nxg8pjx-2xne&sparams=clen%2Cdur%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpcm2cms%2Cpl%2Crequiressl%2Csource%2Cupn%2Cexpire&mt=1455987278&pl=19&itag=248&ms=au&requiressl=yes&mime=video%2Fwebm&id=o-AEDp8NtnoKSYL5Bi0o0LKAlPmprwxo6KDJ6mTKGqOjno&dur=272.355&initcwndbps=4131250&expire=1456008966&upn=jqgBxsh_yc4&sver=3&mv=m&key=yt6&keepalive=yes&source=youtube&clen=42098201&signature=4A701A5FBD3341F85A03E663B738D2E1A9602DB2.7BD5CD2A2797B4AF8379C359C67FDD2FFC64F5D5&ratebypass=yes'
[download] Destination: Taylor Swift - Blank Space.f248.webm

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[download] 100% of 40.15MiB in 00:03                          
[debug] Invoking downloader on u'https://r1---sn-n8t51nxg8pjx-2xne.googlevideo.com/videoplayback?ipbits=0&gir=yes&pcm2cms=yes&fexp=9405191%2C9407472%2C9408490%2C9412842%2C9416126%2C9420452%2C9422596%2C9423661%2C9423662%2C9423849%2C9425064%2C9425281%2C9427482%2C9427678%2C9428703&lmt=1417143739983618&mm=31&ip=212.109.6.214&mn=sn-n8t51nxg8pjx-2xne&sparams=clen%2Cdur%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpcm2cms%2Cpl%2Crequiressl%2Csource%2Cupn%2Cexpire&mt=1455987278&pl=19&itag=251&ms=au&requiressl=yes&mime=audio%2Fwebm&id=o-AEDp8NtnoKSYL5Bi0o0LKAlPmprwxo6KDJ6mTKGqOjno&dur=272.421&initcwndbps=4131250&expire=1456008966&upn=jqgBxsh_yc4&sver=3&mv=m&key=yt6&keepalive=yes&source=youtube&clen=5476750&signature=2A196665216C2691EA39E7146045C06A034BB19D.9BC5F1BCF8B00BF68652F4A659306F7EF1275E99&ratebypass=yes'
[download] Destination: Taylor Swift - Blank Space.f251.webm

[download]   0.0% of 5.22MiB at Unknown speed ETA Unknown ETA
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[download] 100% of 5.22MiB in 00:00                          

[mikhaelkh]

It downloads bestvideo[height<=?1080][ext=webm]+bestaudio[ext=webm] and can't merge them.
Shouldn't it fall back to best[height<=?1080]?

[jaimeMF]

You are explicitly telling youtube-dl that you prefer bestvideo+bestaudio, so that's what it tries to do. Just use -f best[height<=?1080].

[mikhaelkh]

From README.md:

Since the end of April 2015 and version 2015.04.26 youtube-dl uses -f bestvideo+bestaudio/best as default format selection (see #5447, #5456). If ffmpeg or avconv are installed this results in downloading bestvideo and bestaudio separately and muxing them together into a single file giving the best overall quality available. Otherwise it falls back to best and results in downloading the best available quality served as a single file.

I thought, as in readme.md, without ffmpeg or avconv present, youtube-dl should ignore all bestvideo+bestaudio combinations and fall back to first option that downloads single file.

[jaimeMF]

Probably it's not worded correctly. Maybe this is clearer:

Since the end of April 2015 and version 2015.04.26 youtube-dl uses -f bestvideo+bestaudio/best as default format selection (see #5447, #5456) if ffmpeg or avconv are installed. This results in downloading bestvideo and bestaudio separately and muxing them together into a single file giving the best overall quality available. Otherwise it falls back to best and results in downloading the best available quality served as a single file.

Essentially it means that if you don't give a custom --format, youtube-dl uses bestvideo+bestaudio/best if you have ffmpeg and best otherwise.