forwarded screen stutters every several seconds

[Peter Maersk-Moller]

Hi Henry.

The video frame drops/freeze on still images in h264 streams from GStreamer
annoyed me for a long time, but thought the Raspberry Pi was too slow (had
a performance issue) for my purpose HighProfile 5Mbps 720p @30fps. So I
went and bought all new Pi2s for my multi screen video mixing. However same
problem occured although less frequent. Turned out the system wide UDP
eceive buffer size was by default very low for Raspberry Pi and twice or
four time the size for Pi2. In both the Pi and the Pi2, the problem can go
away with enough buffer size.

That said, now you have it running, how about trying out Nicolas's
buffer-size option solution, which is somewhat more elegant as it only
affects the single process? I assume the unit is bytes, but just double it
until the artifacts goes away. Would be interested to see the results.

Best regards
Peter Maersk-Moller

On Sat, Jan 16, 2016 at 4:46 PM, henryco <fhenryco at yahoo.fr> wrote:

> Oh! it works, not only the problem is solved without "intra-refresh=true",
> but it also allows me now to increase the bitrate
> which much improved the resolution
>
> bitrate=5000 already works fine with a buffer x32, but big artefacts are
> back for bitrate = 10000 ..
>
> so i'm wondering how far i can play this game of increasing the Pi buffer
> size...
>
> did not try yet with the udpsrc buffer-size (strange absence of indication
> for the units to be used) ...
>
>
>
> --
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