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• How to get audio track assignment in ffmpeg

  16 février 2012, par David542

  Is there a way to get the audio track assignment in ffmpeg ? For example, if you are in QuickTime, you can view info (Command - I), and see the track assignment. It looks something like this :

  Apple ProRes 422 (HQ), 1,920 x 1,080
  
  Linear PCM, 24 bit little-endian signed integer, 48000 Hz, **Left**
  
  Linear PCM, 24 bit little-endian signed integer, 48000 Hz, **Right**
  
  Linear PCM, 24 bit little-endian signed integer, 48000 Hz, **Center**
  
  Linear PCM, 24 bit little-endian signed integer, 48000 Hz, **LFE Screen**
  
  etc...

  When I do $ ffmpeg -i, it does not show the track assignments —

  Stream #0:12(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels, s32, 1152 kb/s
  
  Metadata:
  
    creation_time   : 2010-09-16 02:23:49
  
    handler_name    : ?Apple Alias Data Handler
  
  Stream #0:13(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels, s32, 1152 kb/s
  
  Metadata:
  
    creation_time   : 2010-09-16 02:23:49
  
    handler_name    : ?Apple Alias Data Handler
  
  Stream #0:14(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels, s32, 1152 kb/s
  
  Metadata:
  
    creation_time   : 2010-09-16 02:23:49
  
    handler_name    : ?Apple Alias Data Handler
  
  Stream #0:15(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, stereo, s32, 2304 kb/s
  
  Metadata:
  
    creation_time   : 2010-09-16 02:23:49
  
    handler_name    : ?Apple Alias Data Handler
  
  Stream #0:16(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, stereo, s32, 2304 kb/s

  Is there a way to get the track assignments in ffmpeg or another program ?

• Chiptune Database and API

  14 septembre 2012, par Multimedia Mike — General

  So I set out to create a website that allows people to easily listen to video game music directly through their web browser. I succeeded in that goal. However, I must admit that the project has limited appeal since the web player is delivered via Chrome’s Native Client technology, somewhat limiting its audience. I’m not certain if anyone really expects NaCl to take off in any serious way, but I still have a few other projects in mind.

  I recently realized that, as a side effect of this project, I accidentally created something of significant value to fans of old video games and associated music– a searchable database of chiptune music and metadata. To my knowledge, no one else has endeavored to create such a thing. I figured that I might as well make the database easily accessible with an API and see where it leads.

  To that end, I created 2 API entry points. First, there is the search API located at http://gamemusic.multimedia.cx/api/search/. This can be exercised by ending the URL with a URL-encoded search string, e.g. : http://gamemusic.multimedia.cx/api/search/super+mario. This returns JSON data containing an array of results in decreasing order of relevance. Each result has a game title, database ID, media URL, system type, and an SHA-1 hash. This is the same API that the site’s own search page uses.

  The database ID can be plugged into http://gamemusic.multimedia.cx/api/metadata/ to retrieve the song’s metadata in JSON format. E.g., the ID for Super Mario Bros. 3 on the NES is 161 : http://gamemusic.multimedia.cx/api/metadata/161.

  I recently read an article about sins against true RESTful API principles which led me to believe I’m almost certainly doing this web API stuff wrong. I don’t think it’s a huge deal, though, since I don’t think anyone actually listens to chiptunes any more. But if there are offline chiptune music players that are still in service and actively maintained, perhaps the authors would like to implement this API. It would require some type of HTTP networking library, a JSON parser, the embedded XZ decoder, and some new code to parse through my .gamemusic and .psfarchive formats.

  This database could be a significant value-add to chiptune playback software, and could help people experience classic game music much more easily.

• FFMPEG - force webm clusters duration [closed]

  1er avril 2021, par Vlad Sineok

  in short, i'm modifying a game that uses a VP8 video format.
the original videos are at 25 fps and have all clusters of nice and perfect duration 0.96 seconds and contain 25 blocks each (except for that last cluster, which usually varies). also every cluster starts with a keyframe. (all that information i gathered using webm_info from google's libwebm repo)

  


  unless all of the requirements are met, the game struggles to play the webm file smoothly, so my own webm files stutter most of the time, because ffmpeg fails to create the correct clusters and mkclean doesn't help either.
so my question is : how would i force ffmpeg to make all clusters have that perfect duration ?
here's what my command currently looks like

  


  for %%f in (*.webm) do (
ffmpeg -y -i %%f -vcodec libvpx -cpu-used 1 -pass 1 -reserve_index_space 16384 -fflags +genpts -crf 15 -slices 8 -g 25 -keyint_min 25 -vprofile 1 -auto-alt-ref 1 -arnr-maxframes 5 -arnr-strength 3 -deadline good -vf scale=512:384,setsar=1:1 -vb 4000k -an -r 25 -movflags use_metadata_tags -f webm NUL && ^
ffmpeg -y -i %%f -vcodec libvpx -cpu-used 1 -pass 2 -reserve_index_space 16384 -fflags +genpts -crf 15 -slices 8 -g 25 -keyint_min 25 -vprofile 1 -auto-alt-ref 1 -arnr-maxframes 5 -arnr-strength 3 -deadline good -vf scale=512:384,setsar=1:1 -vb 4000k -an -r 25 -movflags use_metadata_tags -f webm %%~nf.webm
)