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Re: [Linphone-developers] h264 codec doesn't work due to too low number
Re: [Linphone-developers] h264 codec doesn't work due to too low number of "slices" in ffmpeg
Wed, 8 Jun 2011 23:06:56 +0200
KMail/1.13.7 (Linux/126.96.36.199-0.5-desktop; KDE/4.6.3; x86_64; ; )
OK, bug report is filed:
Let's see what happens ;-)
Am Mittwoch, 8. Juni 2011, 16:40:29 schrieb Simon Morlat:
> Hi Gerhard,
> Yes it is worth to tell ffmpeg guys about that. Using a lot of slice is
> very uncommon for movies (it is usually only one slice !), but for
> network transmission it is very common because it allows to have each
> slices that fits into a single RTP packet. As a result if the RTP packet
> gets lost, only part of the image is affected.
> On 06/06/2011 22:45, Gerhard Stengel wrote:
> > Hi,
> > I had the problem that after a few seconds all my h264 calls with Bria 3.2
> > on the other end terminated
> > the message that the define MAX_SLICES in libavcodec was too small. I
> > patched ffmpeg by increasing
> > in libavcodec/h264.h from 16 to 32 and it works again.
> > I wonder a bit why ffmpeg contains an inappropriate default value for this
> > define. Is the problem I just
> > described commonly seen or does it just hit me? Or maybe Bria uses too may
> > slices...
> > Do you think it's worth filing a but report at the ffmpeg folks? And is 32
> > enough or may it even be that
> > next power of 2, means 64 is needed?
> > I'm using ffmpeg (git dated on 20110604) from Packman on openSUSE 11.4,
> > x86_64, video resolution is CIF.
> > regards
> > Gerhard
> > _______________________________________________
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