[FFmpeg-user] Errors and artefacts when decoding a .h264 file from security camera

[Paul B Mahol]

On Wed, Sep 09, 2020 at 05:18:10PM +0200, Robert Krüger wrote:
> Hi,
> 
> I have a security camera file that gives me decoding errors which are very
> likely the reason for several macroblocks being broken in the resulting
> video (by far not all, you can still recognize the motive).
> 
> Are there any command line flags I can try to fix this or shall I submit a
> trac ticket with the file?

There is no command flags to fix this.
And also this is not bug.
This is feature request to support yet another CCTV camera footage container.

> 
> Thanks,
> Robert
> 
> Command line and output:
> 
> ~/src/FFmpeg/ffmpeg -i file0000.h264 -c:v mpeg4 -q 1 file0000-transcoded.mov
> ffmpeg version N-98974-g2a19232c19 Copyright (c) 2000-2020 the FFmpeg
> developers
>   built with Apple clang version 11.0.0 (clang-1100.0.33.17)
>   configuration: --enable-libkvazaar --enable-gpl --enable-libx264
> --enable-libx265
>   libavutil      56. 58.100 / 56. 58.100
>   libavcodec     58.101.101 / 58.101.101
>   libavformat    58. 51.101 / 58. 51.101
>   libavdevice    58. 11.101 / 58. 11.101
>   libavfilter     7. 87.100 /  7. 87.100
>   libswscale      5.  8.100 /  5.  8.100
>   libswresample   3.  8.100 /  3.  8.100
>   libpostproc    55.  8.100 / 55.  8.100
> [h264 @ 0x7fb2b0009400] Increasing reorder buffer to 1
> [h264 @ 0x7fb2b0009400] Increasing reorder buffer to 2
> [h264 @ 0x7fb2b0009400] Increasing reorder buffer to 4
> Input #0, h264, from 'file0000.h264':
>   Duration: N/A, bitrate: N/A
>     Stream #0:0: Video: h264 (High), yuvj420p(pc, bt709, progressive),
> 1280x720, 25 fps, 25 tbr, 1200k tbn, 50 tbc
> File 'file0000-transcoded.mov' already exists. Overwrite? [y/N] y
> Stream mapping:
>   Stream #0:0 -> #0:0 (h264 (native) -> mpeg4 (native))
> Press [q] to stop, [?] for help
> [swscaler @ 0x7fb260f00000] deprecated pixel format used, make sure you did
> set range correctly
> Output #0, mov, to 'file0000-transcoded.mov':
>   Metadata:
>     encoder         : Lavf58.51.101
>     Stream #0:0: Video: mpeg4 (mp4v / 0x7634706D), yuv420p, 1280x720,
> q=2-31, 200 kb/s, 25 fps, 12800 tbn, 25 tbc
>     Metadata:
>       encoder         : Lavc58.101.101 mpeg4
>     Side data:
>       cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
> [h264 @ 0x7fb2ae80ee00] Invalid NAL unit 0, skipping.
> [h264 @ 0x7fb2ae823000] Invalid NAL unit 0, skipping.
> [h264 @ 0x7fb2ae810600] A non-intra slice in an IDR NAL
> unit.trate=3503.0kbits/s speed=17.9x
> [h264 @ 0x7fb2ae810600] decode_slice_header error
> [h264 @ 0x7fb2ae80ca00] A non-intra slice in an IDR NAL unit.
> [h264 @ 0x7fb2ae80ca00] decode_slice_header error
> [h264 @ 0x7fb2ae80f400] Invalid NAL unit 0, skipping.
> [h264 @ 0x7fb2ae80c400] Invalid NAL unit 0, skipping.
> [h264 @ 0x7fb2ae80ca00] A non-intra slice in an IDR NAL
> unit.trate=3498.9kbits/s speed=19.1x
> [h264 @ 0x7fb2ae80ca00] decode_slice_header error
> [NULL @ 0x7fb2b0009400] sps_id 32 out of range
> [h264 @ 0x7fb2ae80f400] Invalid NAL unit 0, skipping.
> [NULL @ 0x7fb2b0009400] sps_id 32 out of range
> [h264 @ 0x7fb2ae80c400] Invalid NAL unit 0, skipping.
> [NULL @ 0x7fb2b0009400] pps_id 3199971767 out of range8.44
> bitrate=3480.9kbits/s speed=19.4x
> [h264 @ 0x7fb2ae80f400] Invalid NAL unit 0, skipping.
> [NULL @ 0x7fb2b0009400] pps_id 3199971767 out of range
> [h264 @ 0x7fb2ae80c400] Invalid NAL unit 0, skipping.
> [NULL @ 0x7fb2b0009400] too many reference frames 32:08.40
> bitrate=3495.3kbits/s speed=19.5x
> [h264 @ 0x7fb2ae823000] too many reference frames 32
>     Last message repeated 2 times
> frame= 2014 fps=490 q=1.0 Lsize=   34484kB time=00:01:20.52
> bitrate=3508.3kbits/s speed=19.6x
> video:34474kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
> muxing overhead: 0.028308%
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