[Mp4-tech] Error concealment method: frame copy

[Tom Winter]

Hello ,
I was following on JM bug reporter on the frame loss concealment that you
developed was incorporated as part of JM.
I have similar query, but on different context how can decoder handle the
bit losses in header (NAL, SH and MB headers).IS they can way out for this ,
I mean how does concealment work in case of header loss?
An other question Is they any way that I can identify which NAL can be
selected to be dropped.i.e SPS,PPS or DP etc
Sorry for hacking post but thought both on similar lines except for my
second query
Regards,
On Feb 6, 2024 1:45 PM, ashfiqua tahseen <ashfiqua03 yahoo.com> wrote:
> 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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-- 
Tom Winter ,
Graduate Student ,
UNC Charlotte
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