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avconv + aac conversion fails - need to enable experimental features #3226

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opened 2026-02-21 01:11:26 -05:00 by deekerman · 5 comments

deekerman commented

2026-02-21 01:11:26 -05:00

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Originally created by @dinamic on GitHub (Oct 23, 2014).

Using the default conversion via avconv fails if AAC has been specified as audio format.

ERROR: audio conversion failed: Add '-strict experimental' if you want to use it.

This is because the support is considered experimental.
In order to enable it, the following should be added to the command line:

-strict experimental

I would love to contribute a PR, but I don't have Python experience.

Originally created by @dinamic on GitHub (Oct 23, 2014). Using the default conversion via avconv fails if AAC has been specified as audio format. ``` ERROR: audio conversion failed: Add '-strict experimental' if you want to use it. ``` This is because the support is considered experimental. In order to enable it, the following should be added to the command line: ``` -strict experimental ``` I would love to contribute a PR, but I don't have Python experience.

deekerman closed this issue

2026-02-21 01:11:32 -05:00

deekerman commented

2026-02-21 01:11:33 -05:00

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@dinamic commented on GitHub (Oct 23, 2014):

Example:

avconv -i somefile.webm -vn -strict experimental somefile.aac

@dinamic commented on GitHub (Oct 23, 2014): Example: ``` avconv -i somefile.webm -vn -strict experimental somefile.aac ```

deekerman commented

2026-02-21 01:11:33 -05:00

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@jaimeMF commented on GitHub (Oct 23, 2014):

Could be similar to #1027.
Could you post the output of youtube-dl THE_URL OTHER_OPTIONS --verbose and avconv -version (it would also be helpful to know which flags were used to compile it)?

@jaimeMF commented on GitHub (Oct 23, 2014): Could be similar to #1027. Could you post the output of `youtube-dl THE_URL OTHER_OPTIONS --verbose` and `avconv -version` (it would also be helpful to know which flags were used to compile it)?

deekerman commented

2026-02-21 01:11:33 -05:00

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@dinamic commented on GitHub (Oct 24, 2014):

Sure thing.

I have installed youtube-dl using the instructions on the website. I am not sure what flags were used in compiling it.

sudo curl https://yt-dl.org/downloads/2014.10.23/youtube-dl -o /usr/local/bin/youtube-dl
sudo chmod a+x /usr/local/bin/youtube-dl

Here's the output of the commands:

nikola@nikola-450G1:~/Downloads$ youtube-dl "https://www.youtube.com/watch?v=jl1AawIbwy4" -x --audio-format aac --audio-quality 2 --verbose
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['https://www.youtube.com/watch?v=jl1AawIbwy4', '-x', '--audio-format', 'aac', '--audio-quality', '2', '--verbose']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2014.10.18
[debug] Python version 2.7.6 - Linux-3.13.0-37-generic-x86_64-with-Ubuntu-14.04-trusty
[debug] Proxy map: {}
[youtube] Setting language
[youtube] Confirming age
[youtube] jl1AawIbwy4: Downloading webpage
[youtube] jl1AawIbwy4: Downloading video info webpage
[youtube] jl1AawIbwy4: Extracting video information
[youtube] jl1AawIbwy4: Downloading DASH manifest
[debug] Invoking downloader on 'https://r3---sn-puqoxu-nv4e.googlevideo.com/videoplayback?id=8e5d406b021bc32e&itag=172&source=youtube&requiressl=yes&mm=31&mv=m&ms=au&ratebypass=yes&mime=audio/webm&gir=yes&clen=6984875&lmt=1400273452669951&dur=244.487&fexp=902543,927622,930666,930672,931983,932404,936928,939975,947209,948524,950202,952302,952901,957103&signature=14766C7272D5A5BA95B62009B4ED150E23EA7761.258D9E104018A60F3E365D0DB90185734FCC62EB&key=dg_yt0&upn=NThHsN_MGM4&sver=3&mt=1414139479&ip=94.155.194.28&ipbits=0&expire=1414161135&sparams=ip,ipbits,expire,id,itag,source,requiressl,mm,mv,ms,ratebypass,mime,gir,clen,lmt,dur'
[download] Destination: El Doctorado (Letra) ( Bachata versión 2010) -TRUHANES-jl1AawIbwy4.webm
[download] 100% of 6.66MiB in 00:01
[avconv] Destination: El Doctorado (Letra) ( Bachata versión 2010) -TRUHANES-jl1AawIbwy4.aac
[debug] ffmpeg command line: avconv -y -i 'El Doctorado (Letra) ( Bachata versión 2010) -TRUHANES-jl1AawIbwy4.webm' -vn -acodec aac -q:a 2 -f adts 'El Doctorado (Letra) ( Bachata versión 2010) -TRUHANES-jl1AawIbwy4.aac'
ERROR: audio conversion failed: Add '-strict experimental' if you want to use it.
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 1101, in post_process
    keep_video_wish, new_info = pp.run(info)
  File "/usr/local/bin/youtube-dl/youtube_dl/postprocessor/ffmpeg.py", line 193, in run
    raise PostProcessingError(msg)
PostProcessingError

nikola@nikola-450G1:~/Downloads$ avconv -version
avconv version 9.16-6:9.16-0ubuntu0.14.04.1, Copyright (c) 2000-2014 the Libav developers
  built on Aug 10 2014 18:16:02 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
avconv 9.16-6:9.16-0ubuntu0.14.04.1
libavutil     52.  3. 0 / 52.  3. 0
libavcodec    54. 35. 0 / 54. 35. 0
libavformat   54. 20. 4 / 54. 20. 4
libavdevice   53.  2. 0 / 53.  2. 0
libavfilter    3.  3. 0 /  3.  3. 0
libavresample  1.  0. 1 /  1.  0. 1
libswscale     2.  1. 1 /  2.  1. 1

@dinamic commented on GitHub (Oct 24, 2014): Sure thing. I have installed youtube-dl using the instructions on the website. I am not sure what flags were used in compiling it. ``` sudo curl https://yt-dl.org/downloads/2014.10.23/youtube-dl -o /usr/local/bin/youtube-dl sudo chmod a+x /usr/local/bin/youtube-dl ``` Here's the output of the commands: ``` nikola@nikola-450G1:~/Downloads$ youtube-dl "https://www.youtube.com/watch?v=jl1AawIbwy4" -x --audio-format aac --audio-quality 2 --verbose [debug] System config: [] [debug] User config: [] [debug] Command-line args: ['https://www.youtube.com/watch?v=jl1AawIbwy4', '-x', '--audio-format', 'aac', '--audio-quality', '2', '--verbose'] [debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8 [debug] youtube-dl version 2014.10.18 [debug] Python version 2.7.6 - Linux-3.13.0-37-generic-x86_64-with-Ubuntu-14.04-trusty [debug] Proxy map: {} [youtube] Setting language [youtube] Confirming age [youtube] jl1AawIbwy4: Downloading webpage [youtube] jl1AawIbwy4: Downloading video info webpage [youtube] jl1AawIbwy4: Extracting video information [youtube] jl1AawIbwy4: Downloading DASH manifest [debug] Invoking downloader on 'https://r3---sn-puqoxu-nv4e.googlevideo.com/videoplayback?id=8e5d406b021bc32e&itag=172&source=youtube&requiressl=yes&mm=31&mv=m&ms=au&ratebypass=yes&mime=audio/webm&gir=yes&clen=6984875&lmt=1400273452669951&dur=244.487&fexp=902543,927622,930666,930672,931983,932404,936928,939975,947209,948524,950202,952302,952901,957103&signature=14766C7272D5A5BA95B62009B4ED150E23EA7761.258D9E104018A60F3E365D0DB90185734FCC62EB&key=dg_yt0&upn=NThHsN_MGM4&sver=3&mt=1414139479&ip=94.155.194.28&ipbits=0&expire=1414161135&sparams=ip,ipbits,expire,id,itag,source,requiressl,mm,mv,ms,ratebypass,mime,gir,clen,lmt,dur' [download] Destination: El Doctorado (Letra) ( Bachata versión 2010) -TRUHANES-jl1AawIbwy4.webm [download] 100% of 6.66MiB in 00:01 [avconv] Destination: El Doctorado (Letra) ( Bachata versión 2010) -TRUHANES-jl1AawIbwy4.aac [debug] ffmpeg command line: avconv -y -i 'El Doctorado (Letra) ( Bachata versión 2010) -TRUHANES-jl1AawIbwy4.webm' -vn -acodec aac -q:a 2 -f adts 'El Doctorado (Letra) ( Bachata versión 2010) -TRUHANES-jl1AawIbwy4.aac' ERROR: audio conversion failed: Add '-strict experimental' if you want to use it. Traceback (most recent call last): File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 1101, in post_process keep_video_wish, new_info = pp.run(info) File "/usr/local/bin/youtube-dl/youtube_dl/postprocessor/ffmpeg.py", line 193, in run raise PostProcessingError(msg) PostProcessingError ``` ``` nikola@nikola-450G1:~/Downloads$ avconv -version avconv version 9.16-6:9.16-0ubuntu0.14.04.1, Copyright (c) 2000-2014 the Libav developers built on Aug 10 2014 18:16:02 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1) avconv 9.16-6:9.16-0ubuntu0.14.04.1 libavutil 52. 3. 0 / 52. 3. 0 libavcodec 54. 35. 0 / 54. 35. 0 libavformat 54. 20. 4 / 54. 20. 4 libavdevice 53. 2. 0 / 53. 2. 0 libavfilter 3. 3. 0 / 3. 3. 0 libavresample 1. 0. 1 / 1. 0. 1 libswscale 2. 1. 1 / 2. 1. 1 ```

deekerman commented

2026-02-21 01:11:33 -05:00

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@dinamic commented on GitHub (Oct 24, 2014):

I'm running latest update of Ubuntu 14.04.01 LTS. I have not tried on other configurations, so I don't know if its a specific issue to this OS.

@dinamic commented on GitHub (Oct 24, 2014): I'm running latest update of Ubuntu 14.04.01 LTS. I have not tried on other configurations, so I don't know if its a specific issue to this OS.

deekerman commented

2026-02-21 01:11:33 -05:00

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@dstftw commented on GitHub (Jun 12, 2016):

Use --postprocessor-args '-strict experimental' or update avconv/ffmpeg.

@dstftw commented on GitHub (Jun 12, 2016): Use `--postprocessor-args '-strict experimental'` or update avconv/ffmpeg.

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