download-buffer speed

[john.ocallaghan at accenture.com]

Hi All

Am wondering if someone out there can help me to construct a pipe to process video frames faster than 1x speed?

I am creating a GST pipeline with the following elements and caps:

uridecodebin (download=TRUE) -> queue -> appsink (drop=FALSE, buffers=1).

I then have a test framework that uses this pipe and runs in a tight loop calling gst_app_sink_pull_sample().

With the above I have measured that the downloadbuffer constructed in uridecodebin appears to be downloading content at 1x speed.
I think this is the case because if I wait for 10 seconds and then pull 10 seconds of frames then I can see my test pull all the frames in 1sec.
But if I wait less than 10seconds and try the same then I can see it delay (waiting for frames to download).

Basically what I am seeing is that for however many seconds of  frames I want to pull I need to wait that corresponding amount of time or I will see a delay on the pipe.

Is there someway to tell the downloadbuffer to pull data quicker than 1x?

Apologies in advance if I haven’t explained myself very well!
Many thanks
John



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