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why can't execute encode and decode module simultaneously in omx????

xiongzhi yue
Prodigy 20 points
Other Parts Discussed in Thread: TEST2

      In the omx program, I can execute encoder and decoder module independently. However, when I execute encoder and decoder module simultaneously, the program will hang and no video data can't be read from encoder componet output after serveral minutes. I try to make MC_HDVPSS_INT_HEAP_CACHED and MC_HDVICP2_INT_HEAP_CACHED larger, and I find thar the time of executing encoder and decoder will be longer such as half an hour, but the program also hang. I don't know the reason. who can help me??

     Thank you very much!

  • 0
    TI__Mastermind 30480 points

    Hi Yue,

    If you are using EZSDK based OMX applications for encoding and decoding from different threads, it won't work.

    It is a known issue that OMX components don't work in multi-process environment.

    Ram

  • 0 in reply to Ramprasad
    Prodigy 20 points

    HI,Ramprasad , thank you for your reply very much!

    Maybe you misunderstand my issue.

    My omx program is omx progam with a single process. All capture，dei, encode, decode and display components are builded and used in the single process. I create two pthreads in the single process, one for processing encoder ,another for processing decoder. when the two pthreads work simultaneously, the omx program will hang after a piece of time, such as serveral minutes or half an hour. the time is related with  MC_HDVPSS_INT_HEAP_CACHED and MC_HDVICP2_INT_HEAP_CACHED. I don't know why the omx program will hang after some time! 

  • 0 in reply to xiongzhi yue
    Genius 3700 points

    Hi xiongzhi yue,

          Actually the limitation is that you can't run two independent process using OMX since both will try to run OMX_Init so there will be conflicts with syslink, etc.

          If you are using both, the encoder and decoder from the same process you shouldn't have the problem, actually I just run the test using gstreamer and it runs without problems

    1. Create .h264 video

    gst-launch -e videotestsrc num-buffers=200 ! queue ! capsfilter caps="video/x-raw-yuv,format=\(fourcc\)NV12,width=320,height=240,framerate=10/1,color-matrix=sdtv,chroma-site=mpeg2" ! omx_h264enc ! gstperf ! filesink location=test.h264

    2. Then decode the video and at the same time create another to demonstrate both working at the same time:


    gst-launch videotestsrc num-buffers=200 ! queue ! capsfilter caps="video/x-raw-yuv,format=\(fourcc\)NV12,width=320,height=240,framerate=10/1,color-matrix=sdtv,chroma-site=mpeg2" ! omx_h264enc ! gstperf ! filesink location=test2.h264 filesrc location= test.h264 ! capsfilter caps="video/x-h264,width=320,height=240,framerate=10/1,stream-format=byte-stream,alignment=au" ! omx_h264dec ! fakesink -v

    It shouldn't show any problem, even if you add threads (queue elements).

    -David

  • 0 in reply to xiongzhi yue
    TI__Guru* 80190 points

    Hello xiongzhi,

    You could find application VFCC->DEI->VENC->VDEC->VFPC-SC->VFDC here :

    http://processors.wiki.ti.com/index.php/Latency_Measurement_on_Capture_Encode_Decode_Display_Demo

    Could you verify is with this application are you will observe same problem?

    Best Regards,

    Margarita