[Mp4-tech] Error concealment method: frame copy

[ashfiqua tahseen]

Hi Mr. Saurav,
  Thank you.
  What I meant, if slices are lost, then what does the decoder do? It copies only those slices from the previous reference frame?  I am confused reading the methods prior to JM9.8 and after that.
  I highly appreciate your suggestion.
  Thanking you,
  Ashfiqua
Saurav Bandyopadhyay <skbandyopadhyay gmail.com> wrote:
  Ashfiqua,
I am trying to understand your question. A frame can consist of
multiple slices. Why would you need entire frame loss concealment, if
you loose a slice? The algorithms "frame-copy' and 'motion-copy' are
meant to conceal entire frame losses.
Best regards,
Saurav
-- 
Saurav Bandyopadhyay, Ph.D.
Senior Video Engineer
W&W Comm. Inc./DSP Research Inc.
640 W. California Avenue, Suite 200,
Sunnyvale, CA 94086, USA
Tel: +1 (408) 481 0264 x203 (Off)
Email: sauravb wwcoms.com
On Feb 6, 2024 11:31 AM, ashfiqua tahseen wrote:
> Hi,
>
> I want to know about the error concealment method of the decoder. In the
> frame copy concealment method, when a slice is lost, does it discard the
> whole frame and copies the previous reference frrame? I have read that prior
> to JM9.8, the concealment was on slice level i.e. in case of a lost slice,
> the slice was copied from the previous frame. But that version could not
> determine the picture loss. So now the JM uses frame copy. But does it
> replace slices when slice is lost or does it copy the whole frame even only
> one slice is lost?
>
> I'll highly appreciate any suggestion.
>
> Regards,
> Ashfiqua
>
>
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