AW: AW: x264enc -> appsink motion issues

[Thornton, Keith]

Setting zero-latency probably turns off the use of b-frames which are the out of order frames which when played in the wrong order might appear to be jumping back.

-----Ursprüngliche Nachricht-----
Von: gstreamer-devel [mailto:gstreamer-devel-bounces at lists.freedesktop.org] Im Auftrag von yatinla
Gesendet: Dienstag, 28. Februar 2017 23:41
An: gstreamer-devel at lists.freedesktop.org
Betreff: Re: AW: x264enc -> appsink motion issues

yatinla wrote
> 
> Thornton, Keith wrote
>> Hi,
>> It sounds to me like a timer problem to me. X286enc will probably not 
>> output the frames in presentation timestamp order. If you do any 
>> timestamp manipulation, this may result in your backward movements 
>> Grüße
> This is sounding promising.  But I'm not quite sure I understand how 
> to deal with it.  It sounds like x264enc includes a timestamp somehow?  
> I man how would I know how to set the timestamp for outgoing RTP 
> packets if x264enc is not providing them in order?

Well, this was quite unexpected.  I tried setting "tune" parameter to
0x00000004 "zero-latency" and that solved the weird motion problem.  It did not, however, reduce the latency which I thought when I had once tried it before it did.  But I have some other options being set like "threads" to 1 (thought maybe the weird motion was a threading issue) and "speed-preset" to
3 "veryfast" which I did to try to solve the latency.

I was also surprised to find that setting "speed-preset" to 3 seemed to improve the video quality.  I guess that could only make sense if the default were even faster like "superfast" or "ultrafast".






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