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Non-standard usage of HEVC in FLV as input files

I'm seeing ByteDance (Tiktok etc) rolling out HEVC-in-FLV for domestic low-latency live streams in the past month.

Their implementation followed Kingsoft's style (2017), using codecID = 12 (0x000C).

hevc.flv

I see no downside allowing mkvmerge reading the video stream. You may want to warn the user about this unofficial codec ID.

  • MediaInfo identifies the video stream with no problem.
  • FFmpeg refused as it's not standard-compliant.
  • VLC (stable) doesn't support it (yet).

Note: I made a casual binary cut. The last packets in the file may be corrupted.