[FFmpeg-trac] #11280(undetermined:new): Strange green flickering line added with a hevc_vaapi reencode

[FFmpeg]

#11280: Strange green flickering line added with a hevc_vaapi reencode
-------------------------------------+-------------------------------------
             Reporter:  bernd_b      |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:  hevc_vaapi   |               Blocked By:
  reencode                           |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 reencoding a file with hevc_vaapi gives me a green flickering line at the
 bottom of the reencoded video

 How to reproduce:
 {{{
 % ffmpeg -vaapi_device /dev/dri/renderD128 -i
 "./test.convert_hw_vaapi.src.mkv" -metadata:s:v:0
 title="test.convert_hw_vaapi.src" -vf 'format=nv12,hwupload' -c:v
 hevc_vaapi -rc_mode 1 -qp 25 -c:a copy -c:s copy -map 0:v -map 0:a? -map
 0:s? "test.convert_hw_vaapi.result.mkv"
 ffmpeg version N-117685-g1864025458 Copyright (c) 2000-2024 the FFmpeg
 developers
   built with gcc 14.2.1 (GCC) 20240910
   configuration:
   libavutil      59. 46.100 / 59. 46.100
   libavcodec     61. 23.100 / 61. 23.100
   libavformat    61.  9.100 / 61.  9.100
   libavdevice    61.  4.100 / 61.  4.100
   libavfilter    10.  6.100 / 10.  6.100
   libswscale      8.  9.101 /  8.  9.101
   libswresample   5.  4.100 /  5.  4.100
 Input #0, matroska,webm, from './test.convert_hw_vaapi.src.mkv':
   Metadata:
     ENCODER         : Lavf61.9.100
   Duration: 00:00:05.20, start: 0.000000, bitrate: 2191 kb/s
   Stream #0:0: Video: h264 (High), yuv420p(tv, bt709, progressive),
 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 1k tbn (default)
     Metadata:
       BPS             : 11031855
       NUMBER_OF_FRAMES: 133764
       NUMBER_OF_BYTES : 7378325291
       _STATISTICS_WRITING_APP: mkvmerge v76.0 ('Celebration') 64-bit
       _STATISTICS_WRITING_DATE_UTC: 2023-05-06 17:46:08
       _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
       DURATION        : 00:00:05.200000000
   Stream #0:1(ger): Audio: eac3, 48000 Hz, stereo, fltp, 224 kb/s
 (default)
     Metadata:
       BPS             : 224000
       NUMBER_OF_FRAMES: 167206
       NUMBER_OF_BYTES : 149816576
       _STATISTICS_WRITING_APP: mkvmerge v76.0 ('Celebration') 64-bit
       _STATISTICS_WRITING_DATE_UTC: 2023-05-06 17:46:08
       _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
       DURATION        : 00:00:05.024000000
 File 'test.convert_hw_vaapi.result.mkv' already exists. Overwrite? [y/N] y
 Stream mapping:
   Stream #0:0 -> #0:0 (h264 (native) -> hevc (hevc_vaapi))
   Stream #0:1 -> #0:1 (copy)
 Press [q] to stop, [?] for help
 [hevc_vaapi @ 0x5edf54b205c0] Driver does not support some wanted packed
 headers (wanted 0xd, found 0x1).
 Output #0, matroska, to 'test.convert_hw_vaapi.result.mkv':
   Metadata:
     encoder         : Lavf61.9.100
   Stream #0:0: Video: hevc (Main), vaapi(tv, bt709, progressive),
 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 25 fps, 1k tbn (default)
     Metadata:
       encoder         : Lavc61.23.100 hevc_vaapi
       BPS             : 11031855
       NUMBER_OF_FRAMES: 133764
       NUMBER_OF_BYTES : 7378325291
       _STATISTICS_WRITING_APP: mkvmerge v76.0 ('Celebration') 64-bit
       _STATISTICS_WRITING_DATE_UTC: 2023-05-06 17:46:08
       _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
       DURATION        : 00:00:05.200000000
       title           : test.convert_hw_vaapi.src
   Stream #0:1(ger): Audio: eac3 ([0] [0][0] / 0x2000), 48000 Hz, stereo,
 fltp, 224 kb/s (default)
     Metadata:
       BPS             : 224000
       NUMBER_OF_FRAMES: 167206
       NUMBER_OF_BYTES : 149816576
       _STATISTICS_WRITING_APP: mkvmerge v76.0 ('Celebration') 64-bit
       _STATISTICS_WRITING_DATE_UTC: 2023-05-06 17:46:08
       _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
       DURATION        : 00:00:05.024000000
 [out#0/matroska @ 0x5edf54b98e40] video:455KiB audio:137KiB subtitle:0KiB
 other streams:0KiB global headers:0KiB muxing overhead: 0.570535%
 frame=  127 fps=0.0 q=-0.0 Lsize=     595KiB time=00:00:05.02 bitrate=
 970.9kbits/s speed=6.72x
 }}}

 I will add the test file I used here and the output file I got plus the
 log file using "ffmpeg -v 9 -loglevel 99 ...".
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11280>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker