Not at all fluid playback with Gstreamer on android tablet

[Andoni Morales]

2013/2/24 Böhr, Nico <nico.boehr at student.kit.edu>:
> Hello,
>
> I am developing an Android application that receives video data from a Server application. On Android, I used the GStreamer SDK for Android.
>
> Unfortunately, the video is not fluid and I am not able to get more than like one frame per 30 seconds, also the quality of the frames seems very low.
>
> The pipeline on android:
> appsrc name=icestream is-live=1 !
> application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)VP8-DRAFT-IETF-01, payload=(int)96 !
> gstrtpjitterbuffer latency=5000 !
> rtpvp8depay !
> vp8dec !
> autovideosink
>
> and on the server:
> videotestsrc horizontal_speed=10 !
> video/x-raw-yuv,width=640,height=480,framerate=30/1 !
> clockoverlay halign=right valign=bottom shaded-background=true time-format="%H:%M:%S" !
> videorate !
> vp8enc speed=2 max-latency=2 quality=5.0 max-keyframe-distance=3 threads=1 bitrate=3000000 !
> rtpvp8pay !
> appsink name=icestream
>
> I already tried the following:
>
> - Just render a test video on the android device. videotestsrc has fluid playback.
>
> - Use the following pipeline on the android device:
> appsrc name=icestream is-live=1 !
> application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)VP8-DRAFT-IETF-01, payload=(int)96 !
> gstrtpjitterbuffer latency=5000 !
> rtpvp8depay !
> vp8dec !
> jpegenc !
> appsink name=test
>
> then, I took the images from the appsink and saved them to the sd card. I get over 20 frames per second that have excellent quality.
>
> So I think the problem must be somewhere in the rendering of the video.
>
> Can anybody help me out what the problem is?

On Android you should try to use as much as possible the hardware
decoders, which are available through the androidmedia plugin and only
in Jelly Bean (Android 4.2). Your problem is that you are using a
software decoder like vp8dec and the device is not powerful enough to
decode it.

Cheers,
Andoni
>
> Thanks for your help!
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-- 
Andoni Morales Alastruey

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