yuv to avi, picture slips horizontally like old tv

[kozzm0]

stream.yuv from 480p webcam, generated by VLC (version above 1.0), transcodes fine when yuv4mpeg header option is included in the stream dump. But cpu limits make the result choppy and with freezes lasting several seconds.

With yuv4mpeg turned off (the VLC default for yuv output), conversion to avi with ffmpeg is beautiful, except the screen slips left to right, like a tv with bad horizontal hold, along with orthogonal regions of color that look like misplaced leftovers from one of the yuv's.

I know the stream from the webcam is in yuyv, however the linux manpage gives no different instructions for yuyv as opposed to planar yuv (besides which, it worked with the headers).

conversion was, on command line:

ffmpeg -sameq -s 640x480 -i stream.yuv test1.avi

2-pass conversion went fine, assuming I did it right, but produced same result:

 dan@frankenstein:~$ ffmpeg -sameq -s 640x480 -i stream.yuv -pass 1 test2.avi
FFmpeg version SVN-r19352-4:0.5+svn20090706-2ubuntu2, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  configuration: --extra-version=4:0.5+svn20090706-2ubuntu2 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --disable-stripping --disable-vhook --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --extra-cflags=-I/build/buildd/ffmpeg-0.5+svn20090706/debian/include --enable-shared --disable-static
  libavutil     49.15. 0 / 49.15. 0
  libavcodec    52.20. 0 / 52.20. 0
  libavformat   52.31. 0 / 52.31. 0
  libavdevice   52. 1. 0 / 52. 1. 0
  libavfilter    0. 4. 0 /  0. 4. 0
  libswscale     0. 7. 1 /  0. 7. 1
  libpostproc   51. 2. 0 / 51. 2. 0
  built on Oct 13 2009 22:15:16, gcc: 4.4.1
Input #0, rawvideo, from 'stream.yuv':
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0.0: Video: rawvideo, yuv420p, 640x480, 25 tbr, 25 tbn, 25 tbc
Output #0, avi, to 'test2.avi':
    Stream #0.0: Video: mpeg4, yuv420p, 640x480, q=2-31, pass 1, 200 kb/s, 90k tbn, 25 tbc
Stream mapping:
  Stream #0.0 -> #0.0
Press [q] to stop encoding
frame=12555 fps= 13 q=0.0 Lsize=  501067kB time=502.20 bitrate=8173.5kbits/s    
video:500761kB audio:0kB global headers:0kB muxing overhead 0.061099%

dan@frankenstein:~$ ffmpeg -sameq -s 640x480 -i stream.yuv -b 9000k -pass 2 test2.avi
FFmpeg version SVN-r19352-4:0.5+svn20090706-2ubuntu2, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  configuration: --extra-version=4:0.5+svn20090706-2ubuntu2 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --disable-stripping --disable-vhook --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --extra-cflags=-I/build/buildd/ffmpeg-0.5+svn20090706/debian/include --enable-shared --disable-static
  libavutil     49.15. 0 / 49.15. 0
  libavcodec    52.20. 0 / 52.20. 0
  libavformat   52.31. 0 / 52.31. 0
  libavdevice   52. 1. 0 / 52. 1. 0
  libavfilter    0. 4. 0 /  0. 4. 0
  libswscale     0. 7. 1 /  0. 7. 1
  libpostproc   51. 2. 0 / 51. 2. 0
  built on Oct 13 2009 22:15:16, gcc: 4.4.1
Input #0, rawvideo, from 'stream.yuv':
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0.0: Video: rawvideo, yuv420p, 640x480, 25 tbr, 25 tbn, 25 tbc
File 'test2.avi' already exists. Overwrite ? [y/N] y
Output #0, avi, to 'test2.avi':
    Stream #0.0: Video: mpeg4, yuv420p, 640x480, q=2-31, pass 2, 9000 kb/s, 90k tbn, 25 tbc
Stream mapping:
  Stream #0.0 -> #0.0
[mpeg4 @ 0x8514b30][lavc rc] Using all of requested bitrate is not necessary for this video with these parameters.
Press [q] to stop encoding
frame=12555 fps= 13 q=0.0 Lsize=  501067kB time=502.20 bitrate=8173.5kbits/s    
video:500761kB audio:0kB global headers:0kB muxing overhead 0.061099%

if links are allowed in this forum, here's a sample of test2.avi:

http://www.youtube.com/watch?v=LUVpDsq-QJU

Any parameters that can fix this? Using the headers is not gonna be an option. So far mencoder has produced the same exact result.

[mloiaco]

Hi-

I'm having a similar problem with the horizontal scroll. Did you ever figure out how to fix this?

Thanks,
Michael

[jagabo]

AviSynth has raw YUV input filters.