Controlling cache or buffer length in RTSP H.264 live stream?

[Ricky Houghton]

As a follow up, I have determined that the program, Tutorial #4,l thinks
that the stream is "NOT LIVE", however it never hits the buffering_cb
function in tutorial-4.c, so this function is not responsible for the delay.




On Thu, Jan 23, 2014 at 9:15 PM, Ricky Houghton <ricky.houghton at gmail.com>wrote:

> I was able to successfully compile and run the tutorials on my Nexus 7
> device. (Thanks to all who made this possible.)
>
> I modified the code for Android Tutorial #4 slightly to serve up a live
> stream from a H.264 device serving up a RTSP stream. The video displays
> correctly and everything works nicely. I've left it running for more than
> an hour with no issue.
>
> However there is a constant delay of about 4 to 5 seconds on the video
> stream. I've used Bing and Google to search for an answer, but can't seem
> to find which buffer/cache variable might contribute to the delay. (The
> code appears to ignore buffering if the stream is live, but there is
> clearly some buffering underneath that is creating this delay)
>
> Please note, the delay is constant over the hour, so I'm pretty sure the
> decoder is able to keep up - and the latency/delay doesn't increase which
> lends me to believe there is a buffer/cache value that is set rather high.
>
> Thanks,
>
> Ricky
>
> btw, when the application starts, I do receive a few messages similar to
> this one, however they quickly disappear once the video stream synchronizes
> and stabilizes. It normally takes about 3 or 4 seconds for this, then
> everything is fine. I do not see this message again, no matter how long I
> run the encoder.
>
>  01-23 21:10:54.550: W/GStreamer+amcvideodec(2319): 0:00:28.046864000
> 0x69d96860
> gstamcvideodec.c:1025:gst_amc_video_dec_loop:<amcvideodec-omxnvidiah264decode0>
> Frame is too late, dropping (deadline 0:00:00.194772226)
>
> .
>
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