youtube-dl downloads aac instead of ogg when --prefer-free-formats is specified

[mikhaelkh]

[debug] System config: []
[debug] User config: ['--youtube-include-dash-manifest', '--format', 'bestvideo+bestaudio']
[debug] Command-line args: ['--verbose', '--prefer-free-formats', 'https://www.youtube.com/watch?v=2vjPBrBU-TM']
[debug] Encodings: locale cp1251, fs mbcs, out None, pref cp1251
[debug] youtube-dl version 2014.08.10
[debug] Python version 2.7.8 - Windows-7-6.1.7601-SP1
[debug] Proxy map: {}
[youtube] Setting language
[youtube] 2vjPBrBU-TM: Downloading webpage
[youtube] 2vjPBrBU-TM: Downloading video info webpage
[youtube] 2vjPBrBU-TM: Extracting video information
[youtube] 2vjPBrBU-TM: Encrypted signatures detected.
[youtube] {22} signature length 43.40, html5 player en_US-vflArxUZc
[youtube] {43} signature length 43.40, html5 player en_US-vflArxUZc
[youtube] {18} signature length 43.40, html5 player en_US-vflArxUZc
[youtube] {5} signature length 43.40, html5 player en_US-vflArxUZc
[youtube] {36} signature length 43.40, html5 player en_US-vflArxUZc
[youtube] {17} signature length 43.40, html5 player en_US-vflArxUZc
[youtube] {137} signature length 40.41, html5 player en_US-vflArxUZc
[youtube] {248} signature length 40.41, html5 player en_US-vflArxUZc
[youtube] {136} signature length 40.41, html5 player en_US-vflArxUZc
[youtube] {247} signature length 40.41, html5 player en_US-vflArxUZc
[youtube] {135} signature length 40.41, html5 player en_US-vflArxUZc
[youtube] {244} signature length 40.41, html5 player en_US-vflArxUZc
[youtube] {134} signature length 40.41, html5 player en_US-vflArxUZc
[youtube] {243} signature length 40.41, html5 player en_US-vflArxUZc
[youtube] {133} signature length 40.41, html5 player en_US-vflArxUZc
[youtube] {242} signature length 40.41, html5 player en_US-vflArxUZc
[youtube] {160} signature length 40.41, html5 player en_US-vflArxUZc
[youtube] {140} signature length 40.41, html5 player en_US-vflArxUZc
[youtube] {171} signature length 40.41, html5 player en_US-vflArxUZc
[youtube] {137} signature length 43.40, html5 player en_US-vflArxUZc
[youtube] {248} signature length 43.40, html5 player en_US-vflArxUZc
[youtube] {136} signature length 43.40, html5 player en_US-vflArxUZc
[youtube] {247} signature length 43.40, html5 player en_US-vflArxUZc
[youtube] {135} signature length 43.40, html5 player en_US-vflArxUZc
[youtube] {244} signature length 43.40, html5 player en_US-vflArxUZc
[youtube] {134} signature length 43.40, html5 player en_US-vflArxUZc
[youtube] {243} signature length 43.40, html5 player en_US-vflArxUZc
[youtube] {133} signature length 43.40, html5 player en_US-vflArxUZc
[youtube] {242} signature length 43.40, html5 player en_US-vflArxUZc
[youtube] {160} signature length 43.40, html5 player en_US-vflArxUZc
[youtube] {140} signature length 43.40, html5 player en_US-vflArxUZc
[youtube] {171} signature length 43.40, html5 player en_US-vflArxUZc
[youtube] 2vjPBrBU-TM: Downloading DASH manifest
[debug] Invoking downloader on 'https://r3---sn-n8t51nxg8pjx-2xne.googlevideo.com/videoplayback?id=daf8cf06b054f933&itag=248&source=youtube&requiressl=yes&gcr=ru&cmbypass=yes&playback_host=r3---sn-n8t51nxg8pjx-2xne.googlevideo.com&ratebypass=yes&mime=video/webm&gir=yes&clen=41814825&lmt=1399524787500950&dur=231.273&signature=49C4C08BF11F34677E4C1E1FDFBAAE36AE34F60A.90FF2E056AAF33FDBFF2535C75C8E9DBC95C603D&mws=yes&mt=1407698897&mv=m&ms=au&sver=3&mm=31&upn=zIRLOWxVhFI&fexp=902408,927622,931983,934024,934030,935663,936118,941363,945058,946023&key=dg_yt0&ip=212.109.6.214&ipbits=0&expire=1407720574&sparams=ip,ipbits,expire,id,itag,source,requiressl,gcr,cmbypass,playback_host,ratebypass,mime,gir,clen,lmt,dur'
[download] Destination: Sia - Chandelier (Official Video)-2vjPBrBU-TM.f248.webm

[download]   0.0% of 39.88MiB at 166.67KiB/s ETA 04:05
[download]   0.0% of 39.88MiB at 500.00KiB/s ETA 01:21
[download]   0.0% of 39.88MiB at  1.14MiB/s ETA 00:34 
[download]   0.0% of 39.88MiB at  2.44MiB/s ETA 00:16 
[download]   0.1% of 39.88MiB at  3.78MiB/s ETA 00:10 
[download]   0.2% of 39.88MiB at  4.73MiB/s ETA 00:08 
[download]   0.3% of 39.88MiB at  5.91MiB/s ETA 00:06 
[download]   0.6% of 39.88MiB at  6.73MiB/s ETA 00:05 
[download]   1.3% of 39.88MiB at  7.34MiB/s ETA 00:05 
[download]   2.5% of 39.88MiB at  7.46MiB/s ETA 00:05 
[download]   5.0% of 39.88MiB at  7.43MiB/s ETA 00:05 
[download]  10.0% of 39.88MiB at  7.77MiB/s ETA 00:04 
[download]  20.1% of 39.88MiB at  8.23MiB/s ETA 00:03 
[download]  30.1% of 39.88MiB at  6.84MiB/s ETA 00:04 
[download]  40.1% of 39.88MiB at  6.51MiB/s ETA 00:03 
[download]  50.2% of 39.88MiB at  6.31MiB/s ETA 00:03 
[download]  60.2% of 39.88MiB at  5.92MiB/s ETA 00:02 
[download]  70.2% of 39.88MiB at  5.87MiB/s ETA 00:02 
[download]  80.2% of 39.88MiB at  5.34MiB/s ETA 00:01 
[download]  88.5% of 39.88MiB at  5.33MiB/s ETA 00:00 
[download]  98.5% of 39.88MiB at  5.45MiB/s ETA 00:00 
[download] 100.0% of 39.88MiB at  5.43MiB/s ETA 00:00 
[download] 100% of 39.88MiB in 00:07                  
[debug] Invoking downloader on 'https://r3---sn-n8t51nxg8pjx-2xne.googlevideo.com/videoplayback?id=daf8cf06b054f933&itag=141&source=youtube&requiressl=yes&gcr=ru&cmbypass=yes&playback_host=r3---sn-n8t51nxg8pjx-2xne.googlevideo.com&ratebypass=yes&mime=audio/mp4&gir=yes&clen=7377056&lmt=1400327561633607&dur=231.363&signature=0F7BA141E049CE515F86313AADDAA4041DB9C8BF.064860209335BE0B04484652563104DF7A6A5905&mws=yes&mt=1407698897&mv=m&ms=au&sver=3&mm=31&upn=zIRLOWxVhFI&fexp=902408,927622,931983,934024,934030,935663,936118,941363,945058,946023&key=dg_yt0&ip=212.109.6.214&ipbits=0&expire=1407720574&sparams=ip,ipbits,expire,id,itag,source,requiressl,gcr,cmbypass,playback_host,ratebypass,mime,gir,clen,lmt,dur'
[download] Destination: Sia - Chandelier (Official Video)-2vjPBrBU-TM.f141.m4a

[download]   0.0% of 7.04MiB at 166.67KiB/s ETA 00:43
[download]   0.0% of 7.04MiB at 500.00KiB/s ETA 00:14
[download]   0.1% of 7.04MiB at 999.97KiB/s ETA 00:07
[download]   0.2% of 7.04MiB at  2.09MiB/s ETA 00:03 
[download]   0.4% of 7.04MiB at  3.78MiB/s ETA 00:01 
[download]   0.9% of 7.04MiB at  5.59MiB/s ETA 00:01 
[download]   1.8% of 7.04MiB at  5.91MiB/s ETA 00:01 
[download]   3.5% of 7.04MiB at  6.73MiB/s ETA 00:01 
[download]   7.1% of 7.04MiB at  6.16MiB/s ETA 00:01 
[download]  14.2% of 7.04MiB at  7.35MiB/s ETA 00:00 
[download]  28.4% of 7.04MiB at  7.69MiB/s ETA 00:00 
[download]  56.8% of 7.04MiB at  5.11MiB/s ETA 00:00 
[download] 100.0% of 7.04MiB at  4.59MiB/s ETA 00:00 
[download] 100% of 7.04MiB in 00:01                  
[ffmpeg] Merging formats into "Sia - Chandelier (Official Video)-2vjPBrBU-TM.webm"
[debug] ffmpeg command line: ffmpeg -y -i 'Sia - Chandelier (Official Video)-2vjPBrBU-TM.f248.webm' -i 'Sia - Chandelier (Official Video)-2vjPBrBU-TM.f141.m4a' -c copy 'Sia - Chandelier (Official Video)-2vjPBrBU-TM.webm'
ERROR: Could not write header for output file #0 (incorrect codec parameters ?): Error number -22 occurred
Traceback (most recent call last):
  File "youtube_dl\YoutubeDL.pyo", line 1086, in post_process
  File "youtube_dl\postprocessor\ffmpeg.pyo", line 492, in run
  File "youtube_dl\postprocessor\ffmpeg.pyo", line 63, in run_ffmpeg_multiple_files
FFmpegPostProcessorError

By the way, how can I get rid of -2vjPBrBU-TM in file name?

[mikhaelkh]

The settings should be more clear, now --prefer-free-formats only applies to video while --audio-format applies only to audio.
--prefer-free-formats should apply to both video and audio, --audio-format should apply to audio, --video-format — to video.

[clampak]

While the settings are clearer now, youtube-dl's behavior of applying --prefer-free-formats to only the video portion breaks the post-processing by ffmpeg when using --prefer-free-formats -f bestvideo+bestaudio if there are free formats available for both video and audio.

Can this be applied to both video and audio?
If not using --prefer-free-formats, then perhaps something like bestfreevideo+bestfreeaudio?

Right now, it seems like bestvideo+bestaudio should disable --prefer-free-formats, or at least change the behavior to retrieve compatible streams if a free audio format is unavailable.