error handling of CBS

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When use CBS to parse bitstream, it can check invalid synatax/data in the bitstream, and report error. How to handle these error is a problem.

For example, when there are error in SEI, it can break the decoding/transcoding process.

./ffmpeg -bsf:v h264_metadata -i ~/Movies/bean.mp4 -an -f null -

[h264_metadata @ 0x60000392c0f0] Invalid SEI user data unregistered payload.
[h264_metadata @ 0x60000392c0f0] Failed to read unit 0 (type 6).
[h264_metadata @ 0x60000392c0f0] Failed to read access unit from packet.
[vist#0:0/h264 @ 0x14c704ba0] Error applying bitstream filters to a packet: Invalid data found when processing input
[in#0/mov,mp4,m4a,3gp,3g2,mj2 @ 0x14c6062c0] Task finished with error code: -1094995529 (Invalid data found when processing input)
[in#0/mov,mp4,m4a,3gp,3g2,mj2 @ 0x14c6062c0] Terminating thread with return code -1094995529 (Invalid data found when processing input)

We can ignore some error like invalid data.

It would be better with the context that the error happens only with SEI, so it isn't fatal.

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video with broken SEI