Interestingly enough I attempted using mpeg2enc as a change (from ffmpeg) just to see how things were progressing.
I had just compiled the mjpeg suite on my g5, to do some NTSC to PAL conversion. I used the following settings: mpeg2enc -f 8 -q 2 -M 8 I couldn't get it using more than 2 of my cpus, even when I tried -M 32 There were visible errors in the encoded video. Not mpeg artefacts or bandwidth encoding limitations but errors, where a blue scene would end up with a yellow block in it, then motion vectors would smear the yellow across the screen. This occurred consistently throughout the encoded clip, say every GOP or every second GOP. This error does seem similar to the issue you described. I'm not sure how to debug such a result. Mark On 11/05/2007, at 9:34 AM, Jonathan Woithe wrote: > Hi all > > For a long time there have been known issues with encoding at low > quality > factors such as q=2 (ie: high quality encoding) on ix86. I > understand this > was due to something related to potential overflows in some parts > of the MMX > code. From memory the general recommendation from a year or so ago > was that > on ix86 one shouldn't go below a "q" value of 3. > > What is the current status on this - does mpeg2enc still suffer this > limitation or has it been dealt with? > > Regards > jonathan > -- > "Time is an illusion; lunchtime doubly so" > > ---------------------------------------------------------------------- > --- > This SF.net email is sponsored by DB2 Express > Download DB2 Express C - the FREE version of DB2 express and take > control of your XML. No limits. Just data. Click to get it now. > http://sourceforge.net/powerbar/db2/ > _______________________________________________ > Mjpeg-users mailing list > Mjpeg-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/mjpeg-users ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Mjpeg-users mailing list Mjpeg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mjpeg-users
