On 11/11/07 16:05, Reinhard Nissl wrote:
Hi,
Klaus Schmidinger schrieb:
Looks like it is the file size. I have now changed the line
mpeg2enc -f 7 -T 90 -F 3 -np -a 2 -v 0 -o "$TMP2"
to
mpeg2enc -f 7 -T 40 -F 3 -np -a 2 -v 0 -o "$TMP2"
so that the resulting file is about the same size as yours, and now my images also are smooth. However, this most likely means that the picture resolution is now reduced.
Maybe sending a large I-frame continuously causes trouble in the FF DVB cards.
Is there a way to generate a sequence of one (large) I-frame, followed by some number of P-frames, which indicate that there is no change in the image data? Like creating an MPEG sequence from a set of still images, where all stills are the same.
Hhm, if you set -n 3 for ppmtoy4m, mpeg2enc should detect, that there are no changes.
The command sequence I use now looks like this:
pnmscale $S $TMP1 | \ pnmpad -black -width 704 -height 576 | \ ppmntsc --pal | \ ppmtoy4m -F 25:1 -A 4:3 -I p -r -S 420mpeg2 -v 2 -n 3 | \ mpeg2enc -f 7 -a 2 -q 1 -n p -I 0 -T 120 -R 2 -g 10 -G 12 -o "$TMP2" mplex -f 7 -o "$MPG" "$TMP2"
and results in a file with three I-frames:
INFO: [mplex] VIDEO_STATISTICS: e1 INFO: [mplex] Video Stream length: 316949 bytes INFO: [mplex] Sequence headers: 3 INFO: [mplex] Sequence ends : 2 INFO: [mplex] No. Pictures : 3 INFO: [mplex] No. Groups : 3 INFO: [mplex] No. I Frames : 3 avg. size105649 bytes INFO: [mplex] No. P Frames : 0 avg. size 0 bytes INFO: [mplex] No. B Frames : 0 avg. size 0 bytes
So it's a step forward, but we need to make this one I- and two (or more) P-frames.
Klaus