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lag in h264 encoded video

asad malik
Intellectual 400 points

Other Parts Discussed in Thread: TMS320DM368

hi!

I need help regarding a gstreamer pipeline (given below) i am not getting a real time video. there is a lag of approx 1 sec when i play the h.264 encoded transport stream in VLC. i am taking input from composite camera and i am streaming transport stream via lan to VLC running on a windows based PC.

gst-launch -vvv  v4l2sc input-src=COMPOSITE ! video/x-raw-yuv, height=576, width=720, pitch=736, format=\(fourcc\)NV12, framerate=\(fraction\25/1 ! TIPrepEncBuf ! queue ! TIVidenc1 engineName=codecServer codecName=h264enc contiguousInputFrame=TRUE bitRate=9000000 ! mpegtsmux ! udpsink host=192.168.8.2 port=8787

i removed the queue in above pipeline but still no change removed contiguousInputFrame=TRUE property but still no change in lag of the video.

I am running TMS320DM368 evaluation module and i am running DVSDK 4.02.x and my vpfe_capture.bufsize=829440

guidance required please.

Asad

 

  • 0
    TI__Guru**** 153384 points
    Hi,

    Have you already tried the gstreamer pipelines provided with DVSDK?

    Do you see the lag with those pipelines?

    thanks
    Cesar
  • 0 in reply to Cesar
    Intellectual 400 points

    hi cesar !

    thanks for replying

    yes i have tried the example pipelines and they are working fine.

    obtaining video from v4l2src and displaying via tidisplaysink2 are working great with real time response but wheni introduce TIVidenc1 element i start getting lag of 1 to 2 seconds.

    i tried to tune the pipeline by setting properties of various elements but was unable to reduce the lag time.

    gst-launch -vvv v4l2sc input-src=COMPOSITE always-copy=FALSE! video/x-raw-yuv, height=576, width=720, pitch=736, format=\(fourcc\)NV12, framerate=\(fraction\25/1 ! TIPrepEncBuf qos=true! queue ! TIVidenc1 engineName=codecServer codecName=h264enc contiguousInputFrame=TRUE bitRate=9000000 encodingPreset=3 rateControl=3 byteStream=true ! queue ! mpegtsmux ! udpsink host=192.168.8.2 port=8787

    please guide how can i find the time taken by each element in order to have an idea which element is taking the most of time?

    i am running gstreamer 0.10 could it be the reason of this lag? 


    Asad

  • 0 in reply to asad malik
    Intellectual 400 points
    following are the changes that i made to the above pipeline and now the delay is in reasonable range of 1 sec

    gst-launch v4l2sc input-src=COMPOSITE always-copy=FALSE queue-size=6 ! video/x-raw-yuv, height=576, width=720, pitch=736, format=\(fourcc\)NV12, framerate=\(fraction\25/1 ! TIPrepEncBuf ! queue ! TIVidenc1 engineName=codecServer codecName=h264enc contiguousInputFrame=TRUE bitRate=1500000 encodingPreset=3 rateControl=3 ! queue ! mpegtsmux ! udpsink host=192.168.8.2 port=8787 enable-last-buffer=false
  • 0 in reply to asad malik
    Genius 4030 points
    Hi Asad,

    Is the issue resolved?

    Regards,
    Anuj
    Pathpartner Technology Pvt Ltd.
  • 0 in reply to Anuj Kumar Gupta
    Intellectual 400 points
    Hi Anuj !

    actually, i was able to reduce the delay to a acceptable value(~0.7sec) with bitrate at 3Mbps but as soon i increased the

    bitrate >3Mbps packets starts dropping and delay also increased. actually i was using default image of kernel provided with TMS320DM368 EVM board. TI gstreamer plugin offered a limited number of features in kernel image came with SD card so i stopped . now i am installing ridgerun SDK in hope that it will offer more features in TIgstreamer plugin


    Asad
  • 0 in reply to asad malik
    Genius 4030 points
    Hi Asad,

    Did you able to achieve your goal by installing ridgerun SDK??
    If yes then please close this thread bu verifying answer.

    Regards,
    Anuj