youtube-dl converts extracted flac(.flac) to vorbis(.mkv)

[Fusl]

• I've verified and I assure that I'm running youtube-dl 2017.05.09

$ youtube-dl --version
2017.05.09

• At least skimmed through README and most notably FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones
• Bug report (encountered problems with youtube-dl)

Trying to download this YouTube video with audio extraction (-x --audio-format flac --audio-quality 0) enabled causes youtube-dl to download the video in webm, it then converts it to flac which is good, but then also converts it to mkv with vorbis as audio stream (no video stream) which is completely different from the selected --audio-format file format.

$ youtube-dl -civwx --audio-format flac --audio-quality 0 https://www.youtube.com/watch?v=ldhnulwgFmo
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'--audio-quality', u'0', u'--recode-video', u'mkv', u'-civwx', u'--audio-format', u'flac', u'--audio-quality', u'0', u'https://www.youtube.com/watch?v=ldhnulwgFmo']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.05.09
[debug] Python version 2.7.9 - Linux-3.16.0-4-amd64-x86_64-with-debian-8.7
[debug] exe versions: ffmpeg N-85581-ge22d495538-static, ffprobe N-85581-ge22d495538-static
[debug] Proxy map: {}
[youtube] ldhnulwgFmo: Downloading webpage
[youtube] ldhnulwgFmo: Downloading video info webpage
[youtube] ldhnulwgFmo: Extracting video information
[youtube] {22} signature length 40.40, html5 player vflxXnk_G
[youtube] {43} signature length 38.40, html5 player vflxXnk_G
[youtube] {18} signature length 40.40, html5 player vflxXnk_G
[youtube] {36} signature length 40.40, html5 player vflxXnk_G
[youtube] {17} signature length 40.40, html5 player vflxXnk_G
[youtube] {137} signature length 40.40, html5 player vflxXnk_G
[youtube] {248} signature length 40.40, html5 player vflxXnk_G
[youtube] {136} signature length 40.40, html5 player vflxXnk_G
[youtube] {247} signature length 40.40, html5 player vflxXnk_G
[youtube] {135} signature length 40.40, html5 player vflxXnk_G
[youtube] {244} signature length 40.40, html5 player vflxXnk_G
[youtube] {134} signature length 40.40, html5 player vflxXnk_G
[youtube] {243} signature length 40.40, html5 player vflxXnk_G
[youtube] {133} signature length 40.40, html5 player vflxXnk_G
[youtube] {242} signature length 40.40, html5 player vflxXnk_G
[youtube] {160} signature length 40.40, html5 player vflxXnk_G
[youtube] {278} signature length 40.40, html5 player vflxXnk_G
[youtube] {140} signature length 40.40, html5 player vflxXnk_G
[youtube] {171} signature length 40.40, html5 player vflxXnk_G
[youtube] {249} signature length 40.40, html5 player vflxXnk_G
[youtube] {250} signature length 40.40, html5 player vflxXnk_G
[youtube] {251} signature length 40.40, html5 player vflxXnk_G
[debug] Invoking downloader on u'https://r3---sn-xjpm-4g5e.googlevideo.com/videoplayback?dur=231.661&mv=u&mt=1494585048&ms=au&mn=sn-xjpm-4g5e&source=youtube&mm=31&upn=gXQugDZxf7M&lmt=1494525804913509&itag=251&key=yt6&mime=audio%2Fwebm&ipbits=0&keepalive=yes&pl=22&requiressl=yes&gir=yes&expire=1494606711&sparams=clen%2Cdur%2Cei%2Cgir%2Cid%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csource%2Cupn%2Cexpire&id=o-AI44TFISBPdkwSUv6IY4iO2ITG8BOY2QWC0ZZe72RVws&ip=5.9.181.171&clen=3614727&ei=F48VWZ6HDoqHc-mGj-AP&signature=A15E28E041382B6FACA3B8E722F05646FF7E15B4.5015EDEDA142799D707F23D9842104371EE4E0BA&ratebypass=yes'
[download] Destination: Dirtyphonics & Bassnectar - Watch Out (feat. Ragga Twins)  [KJ Sawka Drum Cover]-ldhnulwgFmo.webm
[download] 100% of 3.45MiB in 00:00
[debug] ffmpeg command line: ffprobe -show_streams 'file:Dirtyphonics & Bassnectar - Watch Out (feat. Ragga Twins)  [KJ Sawka Drum Cover]-ldhnulwgFmo.webm'
[ffmpeg] Destination: Dirtyphonics & Bassnectar - Watch Out (feat. Ragga Twins)  [KJ Sawka Drum Cover]-ldhnulwgFmo.flac
[debug] ffmpeg command line: ffmpeg -y -i 'file:Dirtyphonics & Bassnectar - Watch Out (feat. Ragga Twins)  [KJ Sawka Drum Cover]-ldhnulwgFmo.webm' -vn -acodec flac -q:a 0 'file:Dirtyphonics & Bassnectar - Watch Out (feat. Ragga Twins)  [KJ Sawka Drum Cover]-ldhnulwgFmo.flac'
Deleting original file Dirtyphonics & Bassnectar - Watch Out (feat. Ragga Twins)  [KJ Sawka Drum Cover]-ldhnulwgFmo.webm (pass -k to keep)
[ffmpeg] Converting video from flac to mkv, Destination: Dirtyphonics & Bassnectar - Watch Out (feat. Ragga Twins)  [KJ Sawka Drum Cover]-ldhnulwgFmo.mkv
[debug] ffmpeg command line: ffmpeg -y -i 'file:Dirtyphonics & Bassnectar - Watch Out (feat. Ragga Twins)  [KJ Sawka Drum Cover]-ldhnulwgFmo.flac' 'file:Dirtyphonics & Bassnectar - Watch Out (feat. Ragga Twins)  [KJ Sawka Drum Cover]-ldhnulwgFmo.mkv'
Deleting original file Dirtyphonics & Bassnectar - Watch Out (feat. Ragga Twins)  [KJ Sawka Drum Cover]-ldhnulwgFmo.flac (pass -k to keep)

[dstftw]

It does exactly what you ask it to do: --recode-video mkv.

[debug] Command-line args: [u'--audio-quality', u'0', u'--recode-video', u'mkv', u'-civwx', u'--audio-format', u'flac', u'--audio-quality', u'0', u'https://www.youtube.com/watch?v=ldhnulwgFmo']

u'--recode-video', u'mkv'

[Fusl]

God damn. I'm sorry for this invalid bug report, I noticed I had an old alias in my .bashrc 😊