On Mon, 3 Nov 2003, Andrew Stevens wrote: > Well... its got a little way to go before its professional quality...
It's getting closer every week/month though ;) > So, to compare like with like you have to compare default mpeg2enc and MPEG-4 > encoder encoding full CCITT 720x<Y> pictures with interlaced motion modes > active and a BBP picture structure *and* identical pre-encoder processing. Indeed! When I see folks boast about 'real time' encoding (usually with ffmpeg's MPEG4/DivX) they're using SIF (352x240/352x288) and not full 720x<Y> sized data - they're also not using B frames which as Andrew mentions are very cpu intensive. The only time I've seen encoding rates at or below 3fps is on my older Pentium3 systems. > - Go to P frames only (this may sometimes even improve compression!). If you do that (and it has almost always improved the compression for me - sometimes quite substantially) then you may encounter playback difficulties with Ogle - seems they don't handle the dual prime motion estimation :( Other players (including settop boxes) have no problem though. With noisier material the savings from turning off B frames are often on the order of 10 or 15% on filesize. > For example, on my 1700Mhz Athlon/XP, 243 Frames of NTSC (720x480) Movie > Note: this is just the encoder. It is common for the MJPEG decoding and > denoising/scaling etc etc to use pretty much the same CPU resources. I've noticed that yuvdenoise tends to be limited to 5 or 6 frames/sec so adding that to the mix introduces a bottleneck - at least for me. > -f 8 -E -10 -q 6 -K tmpgenc > user 0m34.014s = 7.1 Frame/sec > -f 8 -E -10 -q 6 -R 0 -I 0 -K tmpgenc > user 0m14.580s = 16.6 Frame/sec Ah, quite similar settings to what I've settled on ;) I've too have found that "-q 6 -E -10 -K tmpgenc" produces very good quality output. Hmmm, without the -I 0 I only get about 15 Frame/sec on my Athlon 2800. Does -I 0 make that big of a difference? Cheers, Steven Schultz ------------------------------------------------------- This SF.net email is sponsored by: SF.net Giveback Program. Does SourceForge.net help you be more productive? Does it help you create better code? SHARE THE LOVE, and help us help YOU! Click Here: http://sourceforge.net/donate/ _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users