Capture H.264 frames in appsink

[Gary Metalle]

Hi

 

I’m trying to write an app that will capture H.264 frames from an IP camera via an RTSP source into an app sink. It’s actually a shared library for a SIP application for video calls. As long as I can extract the H.264 frames and forward them on, I don’t have much to do to get this working.

 

Here is the pipeline I’m using:

 

rtspsrc name=rtspsrc is-live=TRUE location="rtsp://admin:admin@192.168.1.51:554/stream1" latency=100 ! rtph264depay name=depay ! video/x-h264,stream-format=byte-stream,alignment=nal ! appsink name=sink emit-signals=TRUE drop=TRUE

 

I seem to be capturing frames ok and I’d even go as far as saying they are valid, but from debug output further up the chain there doesn’t appear to be a reference frames and when I try to view the remote video I just see a black screen (once and only once I saw a broken up image). I have also tried adding the width/height/framerate fields in as well, but that hasn’t helped.

 

The fact that I don’t think there are any keyframes makes me nervous and perhaps (probably) why the remote side is showing a black screen because it is only receiving difference frames. The camera source is set-up to be 720x480 at 20 fps, iframe interval is 20, VBR 5000 kbps.

 

Regards

 

Gary Metalle

Embedded Software Engineer

 

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[Yasushi SHOJI-2]

Hi Gary,

On Fri, Apr 7, 2017 at 6:53 PM, Gary Metalle <[hidden email]> wrote:
> I seem to be capturing frames ok and I’d even go as far as saying they are
> valid, but from debug output further up the chain there doesn’t appear to be
> a reference frames and when I try to view the remote video I just see a
> black screen (once and only once I saw a broken up image). I have also tried
> adding the width/height/framerate fields in as well, but that hasn’t helped.

Make sure that your stream doesn't have any IDR with other method.

I just googled and found this:
http://stackoverflow.com/q/1957427/

Also, if you own the IP Cam, check its manual and see if it's possible to
change interval of IDR.  It might be longer than you expected.

Hope this helps,
--
           yashi
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