[Mp4-tech] fast forward & backward in mpeg-4

[Gopalakrishnan Srinivasan]

Hi,
         Suppose I want to fast forward at 10X and in my incoming stream has I-frames at frame number 1,25,50,75,100...... which has 24 P-frames between two I-frames. In this case how will I decode P-frames as frame number 10,20,30,40,60,70,80,90,110...... as I need reference frame for that.
Thanks & Regards,
SGK
Bharat Soni <bharatsoni gmail.com> wrote:
Hi,
Just adding few things to what Daljit has said. If the sequence has I
frames that are far away from each other (for example 132 frames) in
that case showing only I frame may not be acceptable. So you may have
to show intermediate P frames as well.
This is some what expensive in terms of the memory requirements in
case of reverse playback as you have to decode and store few frames in
advance (which is not the case in only "I" frame decode).
Regards,
Bharat
On Wed, 2 Feb 2024 05:12:38 -0800 (PST), Gopalakrishnan Srinivasan
wrote:
> Hello Experts,
> I am looking into implementation of fast forward and
> fast backward in MPEG-4 simple profile & simple level video decoder. But I
> dont find any information how can we do this. Can anybody help me how can we
> do this.
> Also in MPEG-4 video whether there is any maximum limit
> to place number of "P" frames inbetween two "I" frames. 
> 
> Thanks & Regards,
> SGK
> 
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