Hallo
> To accomplish this I've captured the movie via my bt848-card (composite
> source) into some qt-file of approx. 5GB unsing the following syntax:
> chrt -v -r 99 -- nice -n -20 \
> streamer -t 00:50:00 -n pal -r 25 -f jpeg -F mono16 -w 1 -s 768x576 \
> -C /dev/sound/dsp1 -R 48000 -o movie.mov
> Recording went smooth (Athlon XP1800), nearly no framedrops exept in the
> beginning and ending where there is no clear signal on the tape.
BTW: You do not need to record at full size, 352x288 is enougth.
The streamer help says that you should use -f mjpeg instead of -f jpeg
!!
> The resulting file gets played quite well both in mplayer and lavplay,
> video and audio are really synced until the very end, beginning and end i've
> cut away by glav.
>
> The seperated Audio-stream has the same length as the original movie, even
> when transcoded into mp2.
> lavtrans -o movie.wav -f w movie.eli
> cat movie.wav | mp2enc -r 48000 -o movie.mp2
lav2wav movie.eli | mpeg2enc -o movie.mp2
does the same.
> But the seperated Video-stream is much shorter, e.g. instead of 48:46 it's
> only 39:17 of 39:09, depending on syntax i use:
> 39:09:
> lav2yuv -A 4:3 movie.eli | \
> yuvscaler -O DVD -M BICUBIC -I ACTIVE_704x528+32+24 -v 1 | \
> mpeg2enc --video-norm p --quantisation 7 --reduction-4x4 1 \
> --reduction-2x2 1 --force-b-b-p --reduce-hf 1 --aspect 2 -f 8 \
> -o movie.m2v
> 39:17:
> ...\
> mpeg2enc --aspect 2 -f 8 -o movie.m2v
Do you have some weird output from lav2yuv like:
Not a JPEG file: starts with 0x00 0x00
++ WARN: [lav2yuv] Decoding of Frame 1455 failed
How many frames do you have when you take a look at the editlist file ?
I fear that there are missing frames which are not replicated, or broken
jpeg frame wich are thrown away.
Maybe you runn you command a second time only with:
lav2yuv movie.eli >/dev/null
So you see error easier.
> Can somebody explain the dis-sycronisation, expecially the differences
> between the simple and the optimizing version - the number of frames should
> be the same, or?
> This problem I've encountered on mjpegtools' version 1.6.1.90 and 1.6.2-r3
> on Gentoo, using fhe following USE-flags:
> +3dnow +X +avi +dv +gtk +mmx +quicktime +sdl +sse
> These were my C{XX}FLAGS:
> CFLAGS='-march=athlon-xp -O2 -pipe'
Would you give lavrec a try with a command looking simlair to that:
lavrec -f q -i p -g 352x288 -q 80 -s -l 70 -R l --software-encoding
movie.mov
You will very likely have to change the -i p to something that matches
you input on the bttv card. Read the lavrec manpage for more
information.
auf hoffentlich bald,
Berni the Chaos of Woodquarter
Email: [EMAIL PROTECTED]
www: http://www.lysator.liu.se/~gz/bernhard
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