Hi Anand,
Not sure exactly what you mean. Are you asking about:
(1) The number of bits required to code each picture (e.g., "911376 bits
for the I frame, 115936 for the B frame after it, etc.")? For this, you'll
have to call mpeg2_getpos() to get the position in the stream as you hit
PICTURE headers.
(2) The horizontal and vertical sizes of the luma and chroma matrices.
These are in the sequence header -- see the code to dump_state.c for an
example. E.g., "1920x1088 for luma, 960x544 for chroma".
(3) The intended displayed area of the frame (e.g., "1920x1080"). This is
in the sequence display extension header, also printed out by dump_state.c
("seq->display_width", etc.).
Sizes #2 and #3 are not allowed to vary on a picture-by-picture basis.
Only by ending the sequence and then starting a new sequence can you
change the size of the image. (A picture display extension header can vary
the location of the "display rectangle" within the full luma and chroma
matrices, but it can't change the dimensions of the "display rectangle.")
Hope that helps. If you can be more specific I'd be happy to help further.
Best,
Keith
On Wed, 4 Apr 2007, anand meher wrote:
> Hi,
> i am trying to find the frame sizes of the individual i,b,p frame
> sizes using libmpeg2.the current picture data structure does not provide
> with the frame size.so is there any other way to find the frame sizes
> usiiiing libmpeg2. i am using the decode function in mpeg2dec.c program of
> libmpeg2.
>
> thanks in advance
>
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