On Thu, 16 Mar 2006, Alec Robertson wrote:
> I'm using cinelerra, rendering dv video to a yuv4mpeg stream and piping
> through yuvdeinterlace. After this, there are black bands at the top and
> bottom of my movie. Is there any way to avoid this?
I guess it's a compliment and a vote of confidence that mjpegtools
is expected to fix other folks' programs - thanks! :)
Sounds like cinelerra is emitting an incorrectly formed 'yuv4mpeg2'
stream.
A little more information in the initial report would be useful - would
save time asking for information such as which version of the software
is being used, what's the workflow (exact commands being used for
example), how big are the black bands (just a couple lines? the size
one would expect when letterboxing? most of the frame? ...).
We're not psychic (psycho maybe sometimes ;))...
As a first step look at the YUV4MPEG2 header before going into
any of the 'mjpegtools' programs. Somewhere (in a script? Don't know,
that's more info that'd be helpful) there's the sequence
... | yuvdenoise | ...
replacing yuvdenoise with :
head -n 1
should produce something like:
YUV4MPEG2 W720 H480 F30000:1001 Ip A1:1 C420mpeg2
what we'd need to see is what cinelerra is giving - the above is a
bogus line for illustrative purposes.
Then try putting the head command after yuvdenoise:
... | yuvdenoise | head -n 1
the output willl (should) be the same as before because yuvdenoise
doesn't change stream attributes! If the stream is bogus going into
yuvdenoise it will be bogus coming out of yuvdenoise ;)
I have a hunch that cinelerra is getting the sample aspect ratio
wrong (not the first program to ignore or break that).
Cheers,
Steven Schultz
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