[mythtv] Frame Drops
Mon, 11 Nov 2002 19:12:15 -0700
On Mon, Nov 11, 2002 at 05:27:32PM -0500, Oatz wrote:
> My Nuppelvideo to transcode setup, produces 2 gig files every 15
> minutes (640x480) which take nearly an hour to encode to divx5 or
> mpeg2 on a 935mhz P3. How does mythtv offer the same functions in
It mainly uses rtjpeg which is designed for real time compression (similar
to mjpeg?) If your machine isn't pretty darn fast though you'll probably
have to drop the capture resolution a bit.
> Even with a quad Xeon 2ghz box, you couldnt transcode from
> nuv to mpeg/divx5 at 640x480 @ 23fps in realtime.
I don't know if it's comparable but I can transcode (using mencoder) from
mjpeg to mpeg4 at around 20fps. This is on a dual 500Mhz Celeron system so
I guess a dual 1GHz P3 should handle this in real time. Going to a quad box
wouldn't speed it up much but would allow denoising (sp) or other effects in
real time as well. On my box converting to mpeg1 or mpeg 2 took a lot
longer (like 4-8x longer) but that was using a different encoder too. BTW
there isn't currently any way to convert from MythTVs modivied nupplevideo
to anything else but I'm sure someone will get to that eventually.