[FFmpeg-trac] #886(undetermined:new): when decoding wmv file, logging thousands of "0 errors are concealed" messages

[FFmpeg]

#886: when decoding wmv file, logging thousands of "0 errors are concealed"
messages
-------------------------------------+-------------------------------------
             Reporter:  andrewr      |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 I get errors like this when trying to decode a WMV file. I don't have
 copyright for the file so I can't post it to you. The file does decode,
 although the resulting video has a ton of artifacts.

 It seems odd that we're getting messages like "concealing 0 DC, 0 AC, 0 MV
 errors". This implies we're concealing 0 errors, huh? I put in a patch to
 suppress this message but it was suggested this is a real problem which
 should be fixed (http://ffmpeg.org/pipermail/ffmpeg-
 devel/2012-January/118576.html)

 Here's sample log messages from the command:
 /data/users/andrewr/ffmpeg-git-orig/ffmpeg -i
 /home/andrewr/tmp/concealing0errors.wmv  -map 0:1  -pix_fmt yuv420p -r
 29.970 -s 400x224 -an -f yuv4mpegpipe - > /dev/null
 {{{
 [vc1 @ 0x137c810] Interlaced frames/fields support is incomplete
 [vc1 @ 0x137c810] concealing 0 DC, 0 AC, 0 MV errors
     Last message repeated 17 times
 frame=   17 fps=  0 q=0.0 size=    2231kB time=00:00:00.56
 bitrate=32226.1kbits/concealing 0 DC, 0 AC, 0 MV errors
 [vc1 @ 0x137c810] concealing 0 DC, 0 AC, 0 MV errors
     Last message repeated 15 times
 frame=   34 fps= 32 q=0.0 size=    4463kB time=00:00:01.13
 bitrate=32225.6kbits/concealing 0 DC, 0 AC, 0 MV errors
 [vc1 @ 0x137c810] concealing 0 DC, 0 AC, 0 MV errors
     Last message repeated 15 times
 frame=   51 fps= 32 q=0.0 size=    6694kB time=00:00:01.70
 bitrate=32225.5kbits/
 }}}

 Output from
 ffmpeg -v 9 -loglevel 99 -i /home/andrewr/tmp/concealing0errors.wmv

 {{{
 ffmpeg version N-36427-g46145e8, Copyright (c) 2000-2012 the FFmpeg
 developers
   built on Jan  4 2012 20:49:17 with gcc 4.1.2 20071124 (Red Hat 4.1.2-42)
   configuration: --disable-sse --disable-ssse3 --cc=/usr/bin/gcc
 --cxx=/usr/bin/g++
   libavutil      51. 34.100 / 51. 34.100
   libavcodec     53. 50.100 / 53. 50.100
   libavformat    53. 29.100 / 53. 29.100
   libavdevice    53.  4.100 / 53.  4.100
   libavfilter     2. 57.101 /  2. 57.101
   libswscale      2.  1.100 /  2.  1.100
   libswresample   0.  5.100 /  0.  5.100
 [asf @ 0x1375720] Format asf probed with size=2048 and score=100
 [asf @ 0x1375720] gpos mismatch our pos=24, end=26
 [asf @ 0x1375720] gpos mismatch our pos=24, end=3850
 [asf @ 0x1375720] gpos mismatch our pos=24, end=34
 [asf @ 0x1375720] gpos mismatch our pos=24, end=38
 [asf @ 0x1375720] gpos mismatch our pos=24, end=278
 [asf @ 0x1375720] gpos mismatch our pos=24, end=38
 [wmav2 @ 0x137bc90] err{or,}_recognition separate: 1; 1
 [wmav2 @ 0x137bc90] err{or,}_recognition combined: 1; 10001
 [wmav2 @ 0x137bc90] Unsupported bit depth: 0
 [vc1 @ 0x137c810] err{or,}_recognition separate: 1; 1
 [vc1 @ 0x137c810] err{or,}_recognition combined: 1; 10001
 [vc1 @ 0x137c810] Header: DBFE3BF2
 [vc1 @ 0x137c810] Advanced Profile level 3:
 frmrtq_postproc=7, bitrtq_postproc=31
 LoopFilter=0, ChromaFormat=1, Pulldown=1, Interlace: 1
 TFCTRflag=0, FINTERPflag=0
 [vc1 @ 0x137c810] Entry point: 1044EFC8
 [vc1 @ 0x137c810] Entry point info:
 BrokenLink=0, ClosedEntry=0, PanscanFlag=0
 RefDist=1, Postproc=0, FastUVMC=0, ExtMV=0
 DQuant=0, VSTransform=1, Overlap=0, Qmode=0
 [asf @ 0x1375720] parser not found for codec wmav2, packets or times may
 be invalid.
 [asf @ 0x1375720] max_analyze_duration 5000000 reached at 5100000
 rfps: 29.916667 0.008713
 rfps: 29.916667 0.016016
 rfps: 30.000000 0.002815
 rfps: 59.916667 0.001949
 rfps: 29.970030 0.000075
 rfps: 59.940060 0.000300
 Input #0, asf, from '/home/andrewr/tmp/concealing0errors.wmv':
   Metadata:
     title           : Sněhulák a Marika
     copyright       : ©
     WMFSDKVersion   : 12.0.7601.17514
     WMFSDKNeeded    : 0.0.0.0000
     IsVBR           : 0
   Duration: 00:04:58.23, start: 0.000000, bitrate: 3577 kb/s
     Stream #0:0(eng), 32, 1/1000: Audio: wmav2 (a[1][0][0] / 0x0161),
 48000 Hz, 2 channels, s16, 192 kb/s
     Stream #0:1(eng), 182, 1/1000: Video: vc1 (Advanced) (WVC1 /
 0x31435657), yuv420p, 1920x1080, 1/1000, 5000 kb/s, 29.97 tbr, 1k tbn, 1k
 tbc
 At least one output file must be specified
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/886>
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