[FFmpeg-trac] #6717(undetermined:new): h264 - gray chroma - error while decoding - left block unavailable

FFmpeg trac at avcodec.org
Thu Oct 5 02:32:12 EEST 2017


#6717: h264 - gray chroma - error while decoding - left block unavailable
-------------------------------------+-------------------------------------
             Reporter:  latot        |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Hi all, well i found this problem from mpv, i can't reproduce a video, but
 when i test the file with ffmpeg don't works either.

 This don't happen always, the version 3.2.6 is the last can reproduce and
 work with this video, but from 3.2.7 to 3.3.4 fails.

 here a fragmente from:

 ffmpeg -i in.mkv out.mkv

 ....
 [h264 @ 0xa44ae0] Reference 6 >= 3
 [h264 @ 0xa44ae0] error while decoding MB 39 2, bytestream 24332
 [h264 @ 0xa44ae0] concealing 7930 DC, 7930 AC, 7930 MV errors in P frame
 [h264 @ 0xa31460] top block unavailable for requested intra mode
 [h264 @ 0xa31460] error while decoding MB 109 0, bytestream 20972
 [h264 @ 0xa31460] concealing 8100 DC, 8100 AC, 8100 MV errors in P frame
 [h264 @ 0x9dd5e0] Reference 4 >= 4
 [h264 @ 0x9dd5e0] error while decoding MB 32 1, bytestream 22037
 [h264 @ 0x9dd5e0] concealing 8057 DC, 8057 AC, 8057 MV errors in P frame
 [h264 @ 0x9f26c0] gray chroma
 [h264 @ 0x9f26c0] error while decoding MB 101 1, bytestream 24052
 [h264 @ 0x9f26c0] concealing 7988 DC, 7988 AC, 7988 MV errors in P frame
 [h264 @ 0x1c314c0] top block unavailable for requested intra mode
 [h264 @ 0x1c314c0] error while decoding MB 106 0, bytestream 23977
 [h264 @ 0x837e60] concealing 7769 DC, 7769 AC, 7769 MV errors in P frame
 [h264 @ 0x1c314c0] concealing 8103 DC, 8103 AC, 8103 MV errors in P frame
 [h264 @ 0xa56780] gray chroma
 [h264 @ 0xa56780] error while decoding MB 84 0, bytestream 22106
 [h264 @ 0xa56780] concealing 8125 DC, 8125 AC, 8125 MV errors in P frame
 [h264 @ 0x1b488a0] concealing 7779 DC, 7779 AC, 7779 MV errors in P frame
 [h264 @ 0xb65f60] gray chroma
 [h264 @ 0xb65f60] error while decoding MB 17 2, bytestream 17086
 [h264 @ 0xb65f60] concealing 7952 DC, 7952 AC, 7952 MV errors in P frame
 frame=   47 fps= 45 q=0.0 size=       0kB time=00:00:01.63 bitrate=
 0.0kbits/s[h264 @ 0xa44ae0] left block unavailable for requested intra
 mode
 [h264 @ 0xa44ae0] error while decoding MB 0 2, bytestream 19416
 [h264 @ 0xa44ae0] concealing 7969 DC, 7969 AC, 7969 MV errors in P frame
 [h264 @ 0xa31460] gray chroma
 [h264 @ 0xa31460] error while decoding MB 43 1, bytestream 19356
 ...

 X10000000, and continue, and continue.

 I found some things, first, i can reproduce this with ffmpeg-3.2.6
 installed, all works, with upper version fails.

 But, if i rencode the video with ffmpeg-3.2.6 the video start working with
 any version of ffmpeg.

 I use Gentoo 64, and i try a lot of combinations of USEs but i get the
 same result.

 Thx.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/6717>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker


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