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    RTSP Streaming (to QGC on Android) issues on VOXL Mini

    VOXL 2 Mini
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    • A
      AndriiHlyvko
      last edited by AndriiHlyvko

      Hi, I seem to have issues with streaming rtsp video from voxl mini to QGC on an Android tablet. Initially when I connect from QGC I see the video feed but when I close out QGC and try to open the video stream again I don't see any video. Previously I have been using the same configuration to stream from the VOXL2 and I haven't seen this problem. I tried installing different versions of the voxl-streamer on the mini but it did not help. I am running SDK version 1.1.2 on the Mini. Has anyone seen this problem before?

      Thanks.

      Alex KushleyevA 1 Reply Last reply Reply Quote 0
      • Alex KushleyevA
        Alex Kushleyev ModalAI Team @AndriiHlyvko
        last edited by Alex Kushleyev

        @AndriiHlyvko , can you please run the voxl-streamer in foreground (you can stop the background service using systemctl stop voxl-streamer), run it from command line and see if it outputs any useful information during your QGC connection / disconnection? also, i believe there is a debug mode (-v 0) which may give you more information.

        A 2 Replies Last reply Reply Quote 0
        • A
          AndriiHlyvko @Alex Kushleyev
          last edited by

          @Alex-Kushleyev I ran voxl-streamer in verbose mode in two cases: when I got the video and when I didn't. The voxl-streamer output was the same in both cases (only the port was different). I didn't see any errors either.
          anyways here is the output:

          voxl2-mini:/$ voxl-streamer -v 0
DEBUG:   Using input:     hires_small_encoded
DEBUG:   Using RTSP port: 8900
DEBUG:   Using bitrate:   1000000
DEBUG:   Using decimator: 1
Waiting for pipe hires_small_encoded to appear
Found Pipe
detected following stats from pipe:
w: 1024 h: 768 fps: 15 format: H265
DEBUG:   Frame rate is: 15
DEBUG:   Made rtsp_server
DEBUG:   Created RTSP server main loop context
DEBUG:   Created RTSP server main loop
DEBUG:   Created RTSP server main loop source for callback
DEBUG:   Created timeout loop source for callback
DEBUG:   Got 3 from gst_rtsp_server_attach
Stream available at rtsp://127.0.0.1:8900/live
A new client rtsp://192.168.168.10:52296(null) has connected, total clients: 1
Camera server Connected
DEBUG:   Meta data from incoming frame:
DEBUG:          magic_number 0x564F584C 
DEBUG:          timestamp_ns: 95891853324
DEBUG:          frame_id: -1
DEBUG:          width: 1024
DEBUG:          height: 768
DEBUG:          size_bytes: 77
DEBUG:          stride: 1024
DEBUG:          exposure_ns: 270328
DEBUG:          gain: 54
DEBUG:          format: 4
DEBUG:   Saving h265 SPS
DEBUG:   Creating media pipeline for RTSP client
DEBUG:   Made empty pipeline
DEBUG:   Made test_source
DEBUG:   Made test_caps_filter
DEBUG:   Made overlay_queue
DEBUG:   Made image_overlay
DEBUG:   Made scaler_queue
DEBUG:   Made scaler
DEBUG:   Made converter_queue
DEBUG:   Made video_converter
DEBUG:   Made rotator_queue
DEBUG:   Made video_rotate
DEBUG:   Made video_rotate_filter
DEBUG:   Made app_source
DEBUG:   Made app_source_filter
DEBUG:   Made encoder_queue
DEBUG:   Made omx_encoder
DEBUG:   Made omx_h265_encoder
DEBUG:   Made h264_parser
DEBUG:   Made h265_parser
DEBUG:   Made rtp_filter
DEBUG:   Made rtp_queue
DEBUG:   Made rtp_payload
DEBUG:   Made rtp_h265_payload
VERBOSE: *** Start feeding ***
DEBUG:   SPS accepted
VERBOSE: Frame 1 accepted
VERBOSE: *** Start feeding ***
VERBOSE: Frame 2 accepted
VERBOSE: *** Start feeding ***
          1 Reply Last reply Reply Quote 0
          • A
            AndriiHlyvko @Alex Kushleyev
            last edited by

            @Alex-Kushleyev I am pretty confident right now that this issue is not a modalai issue but a QGC issue. I tried using VLC on Android and it works fine every time but whenever I switch into QGC is when I see the problem.

            Alex KushleyevA 1 Reply Last reply Reply Quote 0
            • Alex KushleyevA
              Alex Kushleyev ModalAI Team @AndriiHlyvko
              last edited by

              @AndriiHlyvko , hmm.. interesting! I am not sure what to suggest, i don't think we have seen this issue. If the RTSP stream is working via VLC, it should also work in QGC.. Both VOXL2 and VOXL2 mini can run the same VOXL2 SDK version (though not exactly the same kernel and a few other things, hence different sdk release files), so essentially the same version of voxl-camera-server, voxl-streamer, voxl-px4, etc.

              VinnyV 1 Reply Last reply Reply Quote 0
              • VinnyV
                Vinny ModalAI Team @Alex Kushleyev
                last edited by

                @AndriiHlyvko @Alex-Kushleyev
                Are you using USB-C for this connection?
                Voxl2 Mini differs from Voxl 2 in that USB-C cable lengths need to be shorter on V2 Mini compared to Voxl 2.
                Voxl 2 uses a re-driver IC to boost the signals on USB-C, whereas to keep V2 Mini small, we removed that part.
                So, not sure if that is a factor or not, but maybe try using a shorter USB-C cable on V2 Mini.
                I have heard of several folks (even internally) that use very long USB-C cables on Voxl 2, then when they try Voxl 2 mini, they forget to use a shorter cable, and some things with USB communications start to fail randomly.

                Give it a shot. Not sure if one mode or another for your stream tries to use faster speeds, but that can possibly explain it.

                A 1 Reply Last reply Reply Quote 0
                • A
                  AndriiHlyvko @Vinny
                  last edited by

                  @Vinny and @Alex-Kushleyev I've narrowed down what the exact problem is. Apparently QGC is not good with H265 video streaming. Once I set the encoding to H264 in voxl-camera config file the video streaming works well. Also FYI I am using microhard radio for the voxl to QGC connection.

                  Alex KushleyevA 1 Reply Last reply Reply Quote 0
                  • Alex KushleyevA
                    Alex Kushleyev ModalAI Team @AndriiHlyvko
                    last edited by

                    @AndriiHlyvko , thank you for following up with your solution!

                    1 Reply Last reply Reply Quote 0
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