>I think I must be doing something silly: every time I try to pipe the
Excellent intuition... :)
>output of either png2yuv or ppmtoy4m into mpeg2enc, mpeg2enc complains:
>
> ERROR: [mpeg2enc] Could not read YUV4MPEG header: bad stream or frame
> header!
>
>Command lines:
> png2yuv -f 25 -I b -n 1 -L 1 -j foo.png | \
> mpeg2enc -f 8 -o output.mpg silence.m2a
^^^^^^^^^^^
mpeg2enc != mplex
Since you supplied an _input filename_ to mpeg2enc, it is trying
to read a YUV4MPEG2 stream from "silence.m2a", and that is failing
(because, I assume, it is an MPEG audio stream).
-matt m.
ps: My own intuition says that your input PNG image doesn't actually
have a 59:54 sample aspect ratio, i.e. you'll need y4mscaler in
the pipeline.
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