[Mp4-tech] [Video] [systems] Rewind

[Bharat Soni]

Hi Dipankar,
It is possible to display even P and B frames in reverse (backward)
direction. The only constraints is the processing power and the
memory. For example in case of DVD, GOP size is limited to about 18
frames. So if you can decode and store all the 18 frames, you can
display all the frames of a GOP in reverse direction. If you do not
have enough memory but if you have good processing power, you may have
to re-decode few (reference) frames to achieve same performance.
I hope this helps.
Regards,
Bharat
On 7/25/05, tech list <mp3.aac.mp4 gmail.com> wrote:
> Hi All,
>     I have a requirement to display fast forward and rewinded video frames
> on the display. I mean that the video should run fast on the screen like it
> is in most DVD players when you FF/RW.
>     There is no issue in implementing this for fast forward, but for rewind,
> how would it be possible to do this, since the decoder cannot decode frames
> backwards. If anyone has any idea how this can be implemented, please let me
> know.
> 
> Dipankar
> 
> _______________________________________________
> NOTE: Please use clear subject lines for your posts. Include [audio,
> [video], [systems], [general] or another apppropriate identifier to indicate
> the type of question you have.
> 
> Note: Conduct on the mailing list is subject to the Antitrust guidelines
> found at
> http://www.mpegif.org/public/documents/vault/mp-out-30042-Antitrust.php
> 
>