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Unknown Codec (tag 2001) - Audio Codecs - MovieCodec.com
https://www.moviecodec.com/audio-codecs/unknown-codec-tag-2001-538/
Get “AC3 Decoder” from http://www.mediatwins.com. Find a serial no. otherwise it will only process half of each file. -Open the AVI file with VirtualDub. -Press File, Save WAV. and save the AVI’s audio stream into a WAV file. -Rename this .WAV file to .AC3. -Use AC3 Decoder to convert it to uncompressed or MP3 .WAV format.
[ubuntu] Cinelerra .avi playback error? (video/x-avi ...
https://ubuntuforums.org/archive/index.php/t-1163284.html
Not sure if you found your solution yet, but the easiest way to play the AVI file would be to install gnome-mplayer (you can do that by running. sudo apt-get install gnome-mplayer.) Also, if you install some codecs for gstreamer, sudo apt-get install gstreamer0.10-ffmpeg gstreamer0.10-fluendo-mp3 gstreamer0.10-plugins-bad gstreamer0.10-bad ...
vlc video/x-unknown decoder error - Linux Mint Forums
https://forums.linuxmint.com/viewtopic.php?t=213561
Mkv is just a container that can have a lot of video or audio formats in there. If you don't have mediainfo-gui installed, install it. It's essential for serious media users, in windoze too. Then open the file with it (in text mode) and copy/paste results here. I suspect it may be HEVC format video but need to know first. bwm Level 1
No Audio while Playing .avi file with MPC+HC - VideoHelp
https://forum.videohelp.com/threads/396849-No-Audio-while-Playing-avi-file-with-MPC-HC
If it contains an uncommon type of audio compression OR if the audio type was mislabelled by the .AVI muxig application then the software player will not find a suitable decoder for the audio stream. P.S.: assuming that the AVI file actually is an AVI and not a renamed VOB, for example. "Like this facility, I don't exist." Quote
avidemux - GStreamer
https://gstreamer.freedesktop.org/documentation/avi/avidemux.html
Play (parse and decode) an .avi file and try to output it to an automatically detected soundcard and videosink. If the AVI file contains compressed audio or video data, this will only work if you have the right decoder elements/plugins installed.
Avi Decoder - CNET Download
https://download.cnet.com/s/avi-decoder/
Avi Decoder free download - Codec Decoder Pack, Free MP4 to AVI Converter, Personal AVI Editor, and many more programs
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