On Tue, 6 Jan 2004, Hans van der Made wrote:
> This used to work, but after updating it's a no-go:
>
> mpeg2enc --format 2 \
> --aspect 2 \
> --video-bitrate 1800 \
> --nonvideo-bitrate 224 \
> --video-norm p \
> --motion-search-radius 24 \
> --reduction-4x4 2 \
> --reduction-2x2 1 \
> --sequence-length 690 \
> -o [videooutput]
>
> Works fine:
Everything looks good there - I see you specified the bitrate
as 1800 (user rate VCD) at this stage but omitted it from the mplex
run below
> INFO: [mpeg2enc] Encoding MPEG-1 video to out.m1v
> But:
>
> mplex -f 2 -o [output]
>
> with previous output files doesn't!
>
> ++ WARN: [mplex] Stream e0: data will arrive too late sent(SCR)=1942357
> required(DTS)=1941882
> ++ WARN: [mplex] Video e0: buf= 25869 frame=000529 sector=00002060
> ++ WARN: [mplex] Audio c0: buf= 1818 frame=000810 sector=00000260
> ++ WARN: [mplex] Padding : sector=00000012
> ++ WARN: [mplex] Stream e0: data will arrive too late sent(SCR)=2374540
> required(DTS)=2373882
> ++ WARN: [mplex] Video e0: buf= 27103 frame=000649 sector=00002527
> ++ WARN: [mplex] Audio c0: buf= 1940 frame=000993 sector=00000319
> ++ WARN: [mplex] Padding : sector=00000012
> ++ WARN: [mplex] Stream e0: data will arrive too late sent(SCR)=2622675
> required(DTS)=2622282
> ++ WARN: [mplex] Video e0: buf= 36533 frame=000717 sector=00002795
> ++ WARN: [mplex] Audio c0: buf= 1986 frame=001099 sector=00000353
> ++ WARN: [mplex] Padding : sector=00000012
> [...]
> **ERROR: [mplex] Too many frame drops -exiting
>
> Any ideas?
Yes ;)
For user specified VCD (-f 2 or 5) it is necessary to specify the
bitrate (as was done for mpeg2enc). Add the video and audio rates,
and then a ~2% overhead factor.
With 224 audio and 1800 video I'd try something like
mplex -f 2 -r 2100 -o 'output%d.mpg' input.m1v input.mp2
it might also be necessary to specify the video buffer size. For
normal VCD that is 46 but for higher rates raising that might be
needed.
mplex -f 2 -b 46 -r 2100 -o 'output%d.mpg' input.m1v input.mp2
if that has problems then increase the -b and -r values slightly
Cheers,
Steven Schultz
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