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I am dealing with a video that as a codec tag of none, but the actual codec is GHEC. I am aware this is a proprietary codec from GeoVision. The video will not play unless I use ffplay with the -vcodec hevc argument. Since GHEC codec will play via hevc codec, is there any way I can force the codec to be hevc on this video so I can watch it in other media players like VLC?

Here are the streams from ffprobe:

    Stream #0:0: Video: none (GHEC / 0x43454847), none, 1920x1080, 451 kb/s, 30 fps, 30 tbr, 30 tbn, 30 tbc
    Stream #0:1: Subtitle: none, 3 kb/s
    Stream #0:2: Subtitle: none
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  • Remux via ffmpeg with the decoder specified.
    – Gyan
    Jun 18, 2020 at 5:41
  • @Gyan anything I try keeps giving me this error: Output file #0 does not contain any stream. I have tried ffmpeg -i in.avi -vcodec:hevc out.avi, ffmpeg -i in.avi -vcodec hevc out.avi, and ffmpeg -i -c:v codec hevc out.avi. Are my commands correct?
    – Agrejus
    Jun 18, 2020 at 16:10
  • Got it, looks like it -c:v hevc must come before the -i argument.
    – Agrejus
    Jun 18, 2020 at 16:33
  • @Gyan If you want to answer my question I can accept the answer
    – Agrejus
    Jun 18, 2020 at 16:33

2 Answers 2

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If you know the compatible codec in ffmpeg, you can remux the file to generate a standard file, e.g.

ffmpeg -c:v hevc -i in.avi -c copy out.avi
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Just an FYI - you can't just force a codec if the moov atom or headers are missing.

For that you need to repair the file by copying valid headers and atoms from another functional file created the same way.

The only utility that worked for me was https://codecpack.co/download/recover-mp4.html - which gives instructions when run without arguments, runs fine on wine, and worked, unlike untrunc and a bunch of other ffpmeg-based utilities.

(The file is archived here: http://web.archive.org/web/20220320003709/https://download1491.mediafire.com/u39upc91ggmg/yf8ct3b58ipbc3l/recover_mp4.zip)

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