On Sat, 17 Sep 2005, reuben wrote:
> Hi, is there a minimum height that jpeg2yuv can handle? I wanted to make
> a small sized animation for a website, and I get the following:
> INFO: [jpeg2yuv] Frame size: 120 x 90
> INFO: [jpeg2yuv] Number of Loops 1
> INFO: [jpeg2yuv] Now generating YUV4MPEG stream.
> INFO: [jpeg2yuv] Processing non-interlaced/interleaved IMG_3817.JPG,
> size 18985l.
> jpeg2yuv: jpegutils.c:658: decode_jpeg_raw: Assertion `xd < (width *
> height / 4)' failed.
Note the ' / 4' part of the assertion
I have a feeling that it's not the smallness of the dimensions
but rather that the height is not a multiple of 4
The assertion is coming out of the section of code which appears
to be downsampling from 4:2:2 to 4:2:0. With 4:2:0 there could be
a requirement to have the vertical (number of lines) be a multiple
of 4 and 90 does not qualify.
As an experiment can you try a 120x92 image. The aspect will be a
little off but if that works but 120x90 does not then my hunch is
correct. Or 160x120 would be a suitable dimension - just a little
larger but a size I've seen fairly often on the 'web'.
Good Luck!
Cheers,
Steven Schultz
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