Decrease latency between different branches of pipeline

[sielf]

Nicolas Dufresne-5 wrote
> Le jeudi 23 mars 2017 à 21:25 -0700, sielf a écrit :
>> The full pipeline is:
>> imxv4l2videosrc-videoconvert(colorspace)-queue--tee--queue-
>> videoconvert(colorspace)-
>> imxg2dvideosink                                                      
>>                      
>>                                                                      
>>     
>> > --queue--videoconvert (colorspace) ---imxg2dvideotransform
>> 
>> (rescale)---videoconvert(colorspace)--imxvpuenc_h264---avimux
>> --filesink
>>                                                                      
>>     
>> > --queue--videoconvert-appsink
>> 
>> 
>> Queues have parameters: max-size-time=10s, max-size-bytes=100M
>> max-size-buffers-500 , I've changed this without any effect. All sink
>> were
>> tried with sync false and true. Qos everywhere is true. Coder has
>> bitrate=0,
>> gop-size=16 quant-param=24 idr=16.
> 
> In general, tee should break zero-copy. So that may explain the jittery
> part. On the other side, you probably need to make the queue on the
> appsink side to be leaky, so it nevers blocks. Otherwise if you don't
> read the appsink fast enough, the other side will be jittery.
> 
> Nicolas
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> 
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Actually, I've solved this problem with decreasing queue size at the
imxg2dvideosink branch to zero, in all max-size parameters. I tested it
without appsink branch. So, your words about tee was right, thanks.
Yeah, about appsink and vpuenc parts I have more problems, but it is another
question.



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