[libav-bugs] [Bug 331] New: tsc2: fix decoding of files encoded with lower quality than maximum

bugzilla-daemon at aruru.libav.org bugzilla-daemon at aruru.libav.org
Fri Jul 13 17:05:44 CEST 2012


https://bugzilla.libav.org/show_bug.cgi?id=331

           Summary: tsc2: fix decoding of files encoded with lower quality
                    than maximum
           Product: Libav
           Version: git HEAD
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: libavcodec
        AssignedTo: bugzilla at libav.org
        ReportedBy: ami_stuff at o2.pl


tsc2 files encoded with lower quality than maximum (tsc2_highq.avi) decodes
with visible artefacts (tsc2_lowq/midq.avi)

C:\>avconv -i tsc2_lowq.avi -vcodec msmpeg4v2 out.avi

avconv version v0.8-2308-g0da2972, Copyright (c) 2000-2012 the Libav developers
  built on Jul 12 2012 18:06:50 with gcc 4.5.2
Input #0, avi, from 'tsc2_lowq.avi':
  Duration: 00:00:12.62, start: 0.000000, bitrate: 1079 kb/s
    Stream #0.0: Video: tscc2, yuv444p, 320x240, 24 fps, 24 tbr, 24 tbn
Output #0, avi, to 'out.avi':
  Metadata:
    ISFT            : Lavf54.7.0
    Stream #0.0: Video: msmpeg4v2, yuv420p, 320x240, q=2-31, 200 kb/s, 24 tbn,
2
4 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (tscc2 -> msmpeg4v2)
Press ctrl-c to stop encoding
[msmpeg4v2 @ 017b1ea0] warning, clipping 1 dct coefficients to -127..127
    Last message repeated 375 times
warning, clipping 1 dct coefficients to -127..12721 bitrate= 363.9kbits/s
[msmpeg4v2 @ 017b1ea0] warning, clipping 1 dct coefficients to -127..127
    Last message repeated 316 times
warning, clipping 1 dct coefficients to -127..12788 bitrate= 304.2kbits/s
[msmpeg4v2 @ 017b1ea0] warning, clipping 1 dct coefficients to -127..127
    Last message repeated 362 times
warning, clipping 1 dct coefficients to -127..12738 bitrate= 330.0kbits/s
[msmpeg4v2 @ 017b1ea0] warning, clipping 1 dct coefficients to -127..127
    Last message repeated 299 times
warning, clipping 1 dct coefficients to -127..12783 bitrate= 335.1kbits/s
[msmpeg4v2 @ 017b1ea0] warning, clipping 1 dct coefficients to -127..127
    Last message repeated 74 times
frame=  303 fps= 95 q=8.5 Lsize=     470kB time=12.62 bitrate= 304.7kbits/s
video:457kB audio:0kB global headers:0kB muxing overhead 2.802344%

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