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Scalable video codec

paulspignon
Intellectual 310 points
Other Parts Discussed in Thread: OMAP3530

Hi! 

We are currently using a "black box" h264 codec from Ti on the C64x+ (OMAP35xx), but really need a scalable codec, in order to be able to adjust the amount of data being sent over a link on the fly, while maintaining full quality in on-board memory. Any have any experience or suggestions on this. Unfortunately it seems impossible to get at the Ti source code, otherwise one might have a head start in hacking it.

 

Cheers,

/Paul

  • 0
    Prodigy 120 points

    I'm unsure what you mean by scalable.

    Ti won't give source code, But you can check out what you can configure for the H264 encoder on the OMAP35xx.

    1) the H264_Encoder_OMAP3530_UserGuide.pdf where is defines the settings IVIDENC1_Params & IVIDENC1_DynamicParams.

    2) the demo scripts in the dvsdk package.  I have an older version but it's in the same general folder: dvsdk_3_00_00_36/dvtb_3_00_015/dvtb-scripts/h264-encode.dvs

     

    If you want to adjust the bitrate you'll need to decide between Constant or Variable bitrate (CBR/VBR).  Parameter rateControlPreset in IVIDENC1_Params allows for IVIDEO_LOW_DELAY = CBR, IVIDEO_STORAGE = VBR, or IVIDEO_NONE = no rate control.  You can also dynamically adjust the bitrate on the fly, though it may take several frames for the encoder to take the bitrate changes.

  • 0 in reply to Davy
    Intellectual 310 points

    Davy, we do know all about setting the encoder parameters, this is already being used in our device. As regards scalable video compression, see for example this compact overview: and the offerings of this company  The crux of the matter is we need to record high-quality video all the time, but sometimes have to stream over a wireless link of fluctuating bandwidth at the same time.

     

    /Paul