Custom-H264 in Liveview?

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Arun Raghavan

• September 08, 2022 13:23

It appears that the Liveview API only provides a DJI-H264 stream (i.e. GDR). Is it possible to switch to Custom-H264 if our decoder needs IDR frames?

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  Arun Raghavan

  • September 08, 2022 19:11

  Adding some more context:

    * We are using the DJI Payload SDK's Liveview API to capture H.264
    * As we understand it, the stream is H.264 GDR (that is, there are
  no IDR frames)
    * We are able to decode the stream with a s/w decoder (ffmpeg)
    * We are not able to decode with h/w decoders (Raspberry Pi 4 and Jetson Nano)
  
  So the questions we have are:
  
    * Is it possible to switch to get a stream with IDR frames (using
  `DjiPayloadCamera_SetVideoStreamType()`) did not help
    * Do we know of any h/w platform that is able to provide accelerated
  decode of the GDR streams?

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  DJI Developer Support

  • September 09, 2022 03:11

  Are you get liveview stream from the drone and camera or devloped third-party camera with PSDK? 1、If you get liveview stream from the drone and DJI cameras (OSDK function), the stream was GDR 2、If you developed your own camera, you can set the stream type according to your camera stream. The API: DjiPayloadCamera_SetVideoStreamType() used to set the channel to the drone from PSDK camera.

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  Arun Raghavan

  • September 09, 2022 03:31

  Thank you. Is there a way to get a non-GDR stream with DJI cameras?

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  DJI Developer Support

  • September 09, 2022 07:02

  The OSDK cannot change the video stream format, the GDR format will be more stable in transmission between the drone and the onboard computer.

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