[Ffmpeg-devel] [bug] Conversions to WMV stutter sporadically

[Tyler Loch]

> 1) This is a user question. Post it on the ffmpeg-users list.
> 2) When you do post it over there, post the command line and the  
> command
> line output.


Command lines and command line output are on the MPlayer ftp server,  
at incoming/wmvstutter/
They're also here:

ffmpeg -i ed.avi -vcodec wmv2 -b 900k -g 48 -an baded.wmv
FFmpeg version SVN-r7856, Copyright (c) 2000-2006 Fabrice Bellard, et  
al.
   configuration:
   libavutil version: 49.3.0
   libavcodec version: 51.32.0
   libavformat version: 51.8.0
   built on Feb  6 2007 15:21:48, gcc: 4.0.1 (Apple Computer, Inc.  
build 5367)
Input #0, avi, from 'ed.avi':
   Duration: 00:00:51.9, start: 0.000000, bitrate: 420 kb/s
   Stream #0.0: Video: mpeg4, yuv420p, 320x176, 30.00 fps(r)
   Stream #0.1: Audio: mp3, 32000 Hz, stereo, 128 kb/s
Output #0, asf, to 'baded.wmv':
   Stream #0.0: Video: wmv2, yuv420p, 320x176, q=2-31, 900 kb/s,  
30.00 fps(c)
Stream mapping:
   Stream #0.0 -> #0.0
Press [q] to stop encoding
[wmv2 @ 0x3cc694]warning, clipping 1 dct coefficients to -255..255
[wmv2 @ 0x3cc694]warning, clipping 1 dct coefficients to -255..255
[wmv2 @ 0x3cc694]warning, clipping 1 dct coefficients to -255..255
[wmv2 @ 0x3cc694]warning, clipping 1 dct coefficients to -255..255
[wmv2 @ 0x3cc694]warning, clipping 1 dct coefficients to -255..255
[wmv2 @ 0x3cc694]warning, clipping 1 dct coefficients to -255..255
frame=  396 q=2.0 size=     754kB time=13.2 bitrate= 467.7kbits/s
[wmv2 @ 0x3cc694]warning, clipping 1 dct coefficients to -255..255
[wmv2 @ 0x3cc694]warning, clipping 1 dct coefficients to -255..255
[wmv2 @ 0x3cc694]warning, clipping 1 dct coefficients to -255..255
[wmv2 @ 0x3cc694]warning, clipping 1 dct coefficients to -255..255
[wmv2 @ 0x3cc694]warning, clipping 1 dct coefficients to -255..255
frame=  841 q=2.0 size=    1579kB time=28.0 bitrate= 461.3kbits/s
[wmv2 @ 0x3cc694]warning, clipping 1 dct coefficients to -255..255
[wmv2 @ 0x3cc694]warning, clipping 1 dct coefficients to -255..255
[wmv2 @ 0x3cc694]warning, clipping 1 dct coefficients to -255..255
frame= 1251 q=2.0 size=    2372kB time=41.7 bitrate= 466.0kbits/s
[wmv2 @ 0x3cc694]warning, clipping 1 dct coefficients to -255..255
frame= 1559 q=2.0 Lsize=       0kB time=52.0 bitrate=   0.1kbits/s
video:2933kB audio:0kB global headers:0kB muxing overhead -99.985714%




ffmpeg -i baded.wmv -b 900k -g 48 -an badedplayback.avi
FFmpeg version SVN-r7856, Copyright (c) 2000-2006 Fabrice Bellard, et  
al.
   configuration:
   libavutil version: 49.3.0
   libavcodec version: 51.32.0
   libavformat version: 51.8.0
   built on Feb  6 2007 15:21:48, gcc: 4.0.1 (Apple Computer, Inc.  
build 5367)

Seems stream 0 codec frame rate differs from container frame rate:  
1000.00 (1000/1) -> 29.97 (30000/1001)
Input #0, asf, from 'baded.wmv':
   Duration: 00:00:51.9, start: 2.000000, bitrate: 471 kb/s
   Stream #0.0: Video: wmv2, yuv420p, 320x176, 29.97 fps(r)
Output #0, avi, to 'badedplayback.avi':
   Stream #0.0: Video: mpeg4, yuv420p, 320x176, q=2-31, 900 kb/s,  
29.97 fps(c)
Stream mapping:
   Stream #0.0 -> #0.0
Press [q] to stop encoding
[wmv2 @ 0x3cc694]overreading 27 bits
[wmv2 @ 0x3cc694]concealing 220 DC, 220 AC, 220 MV errors
[wmv2 @ 0x3cc694]overreading 26 bits
[wmv2 @ 0x3cc694]concealing 220 DC, 220 AC, 220 MV errors
[wmv2 @ 0x3cc694]overreading 14 bits
[wmv2 @ 0x3cc694]concealing 220 DC, 220 AC, 220 MV errors
frame=  419 q=2.0 size=     696kB time=14.0 bitrate= 408.0kbits/s
[wmv2 @ 0x3cc694]overreading 9 bits
[wmv2 @ 0x3cc694]concealing 220 DC, 220 AC, 220 MV errors
[wmv2 @ 0x3cc694]overreading 26 bits
[wmv2 @ 0x3cc694]concealing 220 DC, 220 AC, 220 MV errors
[wmv2 @ 0x3cc694]overreading 51 bits
[wmv2 @ 0x3cc694]concealing 220 DC, 220 AC, 220 MV errors
frame=  893 q=2.0 size=    1397kB time=29.8 bitrate= 384.2kbits/s
[wmv2 @ 0x3cc694]overreading 25 bits
[wmv2 @ 0x3cc694]concealing 220 DC, 220 AC, 220 MV errors
frame= 1306 q=2.0 size=    2114kB time=43.6 bitrate= 397.4kbits/s
[wmv2 @ 0x3cc694]overreading 6 bits
[wmv2 @ 0x3cc694]concealing 220 DC, 220 AC, 220 MV errors
[wmv2 @ 0x3cc694]overreading 8 bits
[wmv2 @ 0x3cc694]concealing 220 DC, 220 AC, 220 MV errors
frame= 1558 q=2.0 Lsize=    2555kB time=52.0 bitrate= 402.6kbits/s
video:2512kB audio:0kB global headers:0kB muxing overhead 1.703831%



-Tyler Loch
Techspansion LLC
http://www.techspansion.com