[x264-devel] Support --seek for fifos

[Håkan Hjort]

Hi,

attached is a patch to make --seek work even when the input is a fifo
(or other FILE* that do not support fseek()).  It re-indents some code
so the first part is produced with 'duff -u' to make it easier to see
what has actually changed.  The second part is the actual patch.

It simply changes the code so that if the seek fails then it loops
reading frames until the desired frame is reached.  I modified the yuv
and y4m input methods.

Regards,
Håkan
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