issues when parsing h264

[apua]

Summary of the bug:
When ffmpeg get live stream from specific device as input, it shows a lot of errors and not processing stream correctly:
[h264 @ 0x327f3210] missing picture in access unit with size xxx

It seems, this is error from libavcodec\h264_parser.c, function parse_nal_units
nal.type of these NALs is 6 (H264_NAL_SEI)

Problematic behavior can be reproduced using attached file.

How to reproduce:

% ffmpeg -i libavcodec_h264_parser_c_parse_nal_units.mp4 -vcodec copy -acodec copy -f null /dev/null
ffmpeg version git-master, 6.0, 5.1
built on arm or x64

Checked with 5.1, 6.0 and git-master with the same result.

[Balling]

ffplay.exe -vcodec h264_cuvid libavcodec_h264_parser_c_parse_nal_units.mp4

HW accelerator agrees this is invalid file.

[apua]

This file is recorded by Wowza Streaming Engine when live streaming from specific device. Wowza accepted stream and played it.
Also vcl playing this recorded file.
That's why I assume it is rather correct or almost correct than completely incorrect.

[quinkblack]

The file is broken, verified by VQ analyzer. ffplay can show some frames. Nothing we can do.