Opened 10 months ago

#7176 new defect

Resolution-related artefacts with clearvideo

Reported by: cehoyos Owned by:
Priority: normal Component: avcodec
Version: git-master Keywords: clv
Cc: Blocked By:
Blocking: Reproduced by developer: no
Analyzed by developer: no

Description

Piotr kindly provided a new set of RealMedia files with Clearvideo content that shows heavy artefacts with FFmpeg but not RealPlayer.

$ ffmpeg -i bean2_324_500kbps_normal_encoding.rm -qscale 2 out.avi
ffmpeg version N-90888-gad16423 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 6.4.0 (GCC)
  configuration: --enable-gpl
  libavutil      56. 17.100 / 56. 17.100
  libavcodec     58. 19.100 / 58. 19.100
  libavformat    58. 13.100 / 58. 13.100
  libavdevice    58.  4.100 / 58.  4.100
  libavfilter     7. 21.100 /  7. 21.100
  libswscale      5.  2.100 /  5.  2.100
  libswresample   3.  2.100 /  3.  2.100
  libpostproc    55.  2.100 / 55.  2.100
Input #0, rm, from 'bean2_324_500kbps_normal_encoding.rm':
  Metadata:
    title           : Title
    author          : Author
    copyright       : Copyrgiht
  Duration: 00:00:41.96, start: 0.000000, bitrate: 404 kb/s
    Stream #0:0: Video: clearvideo (CLV1 / 0x31564C43), yuv420p, 324x244, 500 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
Please use -q:a or -q:v, -qscale is ambiguous
Stream mapping:
  Stream #0:0 -> #0:0 (clearvideo (native) -> mpeg4 (native))
Press [q] to stop, [?] for help
Output #0, avi, to 'out.avi':
  Metadata:
    INAM            : Title
    author          : Author
    ICOP            : Copyrgiht
    ISFT            : Lavf58.13.100
    Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 324x244, q=2-31, 200 kb/s, 15 fps, 15 tbn, 15 tbc
    Metadata:
      encoder         : Lavc58.19.100 mpeg4
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
frame=  630 fps=0.0 q=2.0 Lsize=   16164kB time=00:00:42.00 bitrate=3152.8kbits/s speed=81.4x
video:16143kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.127851%

The output looks horribly broken, the issue is apparently related to the width, 320 works fine now.

Attachments (4)

Change History (4)

Changed 10 months ago by cehoyos

Changed 10 months ago by cehoyos

Changed 10 months ago by cehoyos

Changed 10 months ago by cehoyos

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