[Libav-user] Does the image2 demuxer work with a custom AVIOContext?

Paul B Mahol onemda at gmail.com
Wed Feb 19 22:02:51 CET 2014

On 2/19/14, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:
> Carl Eugen Hoyos <cehoyos at ...> writes:
>> Robert Krueger <krueger <at> ...> writes:
>> > cat ~/samples/fate/dpx/lighthouse_rgb48.dpx | ./ffmpeg
>> > -f image2pipe -vcodec dpx -i - ~/tmp/fromdpx_pipe2.png
>> > [dpx  <at>  0x7fcb21822600] Overread buffer. Invalid header?
>> The image is cut in the middle
> Iiuc, the parser reads the file size from the file
> header while the decoder calculates the (minimal
> possible) file size. The value that the parser
> reads from the file header is too small.
> I suspect the bug can be fixed by reusing the logic
> to determine the image size also in the parser or
> by ignoring the file size outputting everything until
> the next magic marker.

There is no bug in parser, bug is in dpx file which do not
conform to the specification.

FFmpeg dpx encoder is fine.

ImageMagick sucks.

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