Dik Takken wrote:
>
> Hi all,
>
> I was just trying to create a single MPEG2 file from multiple DV files,
> where each DV file is treated differently (different denoising etc). I
> tried to do this:
>
> ( scriptA.sh ; scriptB.sh ) | y4mscaler ... | mpeg2enc ...
>
> The shell scripts each produce a yuv stream on stdout. These streams are
> concatenated and fed to the stdin of y4mscaler and other utils.
>
> Unfortunately, it turns out that this does not work. Some (all?) MJPEG
> tools panic when they find a new stream header in the middle of a yuv
> stream.
>
> Is there any way to make this work? Will it work when I strip the
> headers from the yuv streams? If so, how can I strip the yuv header from
> a shell script?
Steven M. Shultz gave me the solution to this problem a while ago. You
need to create a bash function to strip out the header line from the
second (and subsequent) yuv streams.
e.g.
[start of script]
#!/bin/bash
skip1()
{
read junk
cat
return 0
}
( scriptA.sh ; scriptB.sh | skip1 ; scriptC.sh | skip1 ) | y4mscaler ...
| mpeg2enc ...
[end of script]
Dave.
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