On 10/14/14 6:46 PM, Ben Mesander wrote:
On Tue, Oct 14, 2014 at 1:50 PM, Sethuraman V
<[email protected] <mailto:[email protected]>> wrote:
I can't understand why an 'I' frame read from a video file can't
be written/encoded back to the video file. For other frames 'P'
and 'B' there are dependencies, so writing/encoding the complete
frame can't be done, but why this applies to 'I' frame too, which
is a separate frame on its own.
Hi,
The P and B frames depend on nearby I frames. Also, when you
re-encode an I frame, there is no reason to expect it to be the same
size as it was before.
So in the general case, you have to re-encode every frame after the
I frame in addition to the I frame. This can of course vary based on
GOP structure.
It's not a practical thing to do.
Regards,
Ben
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why does the differing size of the new I frame matter?
Joshua Kordani
LSA Autonomy
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