[FFmpeg-trac] #655(undetermined:reopened): mms stream shows artefacts after some time

[FFmpeg]

#655: mms stream shows artefacts after some time
-------------------------------------+-------------------------------------
             Reporter:  qrtt1        |                    Owner:
                 Type:  defect       |                   Status:  reopened
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:  mms asf vc1  |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  1
-------------------------------------+-------------------------------------

Comment (by cehoyos):

 Second sample attached that should explain the cause for the artefacts:
 The stream changes between vc1 (normal program) and wmv3 (some
 commercials).
 {{{
 $ ffmpeg -i ticket655_cut.asf -i ticket655_wmv3.asf
 ffmpeg version N-35086-g530a540, Copyright (c) 2000-2011 the FFmpeg
 developers
   built on Nov 23 2011 00:29:45 with gcc 4.5.3
   configuration: --cc='/usr/local/gcc-4.5.3/bin/gcc -m32'
   libavutil    51. 26. 0 / 51. 26. 0
   libavcodec   53. 36. 0 / 53. 36. 0
   libavformat  53. 21. 0 / 53. 21. 0
   libavdevice  53.  4. 0 / 53.  4. 0
   libavfilter   2. 49. 0 /  2. 49. 0
   libswscale    2.  1. 0 /  2.  1. 0
 [asf @ 0x8d93a80] parser not found for codec wmav2, packets or times may
 be invalid.
 [asf @ 0x8d93a80] max_analyze_duration 5000000 reached at 5120000
 [asf @ 0x8d93a80] Estimating duration from bitrate, this may be inaccurate

 Seems stream 1 codec frame rate differs from container frame rate: 16.00
 (512/32) -> 8.00 (512/64)
 Input #0, asf, from 'ticket655_cut.asf':
   Metadata:
     WMFSDKVersion   : 11.0.5721.5265
     WMFSDKNeeded    : 0.0.0.0000
     IsVBR           : 0
   Duration: 00:01:25.59, start: 225.374000, bitrate: 245 kb/s
     Stream #0:0: Audio: wmav2 (a[1][0][0] / 0x0161), 16000 Hz, 1 channels,
 s16, 12 kb/s
     Stream #0:1: Video: vc1 (Advanced) (WVC1 / 0x31435657), yuv420p,
 400x300 [SAR 1:1 DAR 4:3], 233 kb/s, 8 tbr, 1k tbn, 16 tbc
 [wmv3 @ 0x8d99780] Extra data: 8 bits left, value: 0
 [asf @ 0x8d9b4e0] parser not found for codec wmav2, packets or times may
 be invalid.
 [asf @ 0x8d9b4e0] Estimating duration from bitrate, this may be inaccurate

 Seems stream 1 codec frame rate differs from container frame rate: 1000.00
 (1000/1) -> 29.97 (30000/1001)
 Input #1, asf, from 'ticket655_wmv3.asf':
   Metadata:
     WMFSDKVersion   : 11.0.6001.7001
     WMFSDKNeeded    : 0.0.0.0000
     IsVBR           : 0
   Duration: 00:00:24.01, start: 0.000000, bitrate: 247 kb/s
     Stream #1:0(eng): Audio: wmav2 (a[1][0][0] / 0x0161), 16000 Hz, 1
 channels, s16, 12 kb/s
     Stream #1:1(eng): Video: wmv3 (Main) (WMV3 / 0x33564D57), yuv420p,
 400x300, 235 kb/s, SAR 1:1 DAR 4:3, 29.97 tbr, 1k tbn, 1k tbc
 At least one output file must be specified
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/655#comment:11>
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