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    voxl-rtsp jpeg is all green

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    • Daniel RyuD
      Daniel Ryu
      last edited by

      Hello, I am trying to use voxl-rtsp to get frames from the tracking camera and sending it to my computer. I can save the frames and send them to my laptop, but when I view the jpegs, they look all green.

      Command I ran on m500 drone: voxl-rtsp -c 1 -d 100 -f jpeg

      I copied the files using the scp command.

      Screenshot from 2021-07-21 15-22-28.png

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      • Alex KushleyevA
        Alex Kushleyev ModalAI Team
        last edited by

        Hi Daniel,

        I just tried this to double check and was able to get valid jpegs for hires and tracking camera using the same command. What cameras do you have plugged in? Are you able to view rtsp stream from voxl-rtsp using VLC from the same camera?

        It looks like the jpeg itself is intact in your case, but the data that was used to generate the jpeg is corrupted. Is voxl-camera-server disabled when you run voxl-rtsp?

        Alex

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        • Daniel RyuD
          Daniel Ryu @Alex Kushleyev
          last edited by

          @Alex-Kushleyev I am able to stream to VLC just fine. Could the images be corrupted from using scp to transfer the files from the drone to the laptop?

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          • Alex KushleyevA
            Alex Kushleyev ModalAI Team
            last edited by

            It is unlikely that corruption is coming from scp. Can you try making a jpeg from the hires camera in the same way?

            Just in case, can you please try to compile voxl-rtsp from dev branch and test again? https://gitlab.com/voxl-public/utilities/voxl-rtsp/-/tree/dev

            Daniel RyuD 1 Reply Last reply Reply Quote 0
            • Daniel RyuD
              Daniel Ryu @Alex Kushleyev
              last edited by

              @Alex-Kushleyev I used adb pull and the jpeg was uncorrupted

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              • Alex KushleyevA
                Alex Kushleyev ModalAI Team
                last edited by

                wow that's very surprising.. can you do an scp again after you adb pulled it and see if the file is still corrupt?

                Daniel RyuD 1 Reply Last reply Reply Quote 0
                • Daniel RyuD
                  Daniel Ryu @Alex Kushleyev
                  last edited by

                  @Alex-Kushleyev zi l legitimately have no idea why but scp was able to pull the files uncorrupted. Only thing that was different was that I attempted to run voxl-streamer (which didn't even run). At any rate, problem is fixed, thanks!

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

                    @Daniel-Ryu I have a few more questions, if you don't mind.. I'd like to figure out what happened:

                    • Did you adb pull the same jpeg which previously was copied via scp from VOXL and ended up being corrupted (or did you grab another jpeg) and then adb pulled a new jpeg
                    • When scp failed to copy jpeg correctly, did you reboot voxl after you saved jpeg using voxl-rtsp but before you copied using scp? If the power was pulled before the OS got a chance to do a sync to flash storage, the file could have been corrupted.

                    It seems scp should guarantee file integrity based on this : https://unix.stackexchange.com/questions/253233/do-i-need-to-check-for-file-corruption-once-scp-is-done so it seems like maybe the file was corrupted on VOXL, so it's important to know whether you were able to pull that same jpeg using adb pull or did you try on a new jpeg.

                    Daniel RyuD 1 Reply Last reply Reply Quote 0
                    • Daniel RyuD
                      Daniel Ryu @Alex Kushleyev
                      last edited by

                      @Alex-Kushleyev These were new jpegs, as I had deleted the old ones. I did not reboot after saving the jpegs but before copying with scp.

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                      • Daniel RyuD
                        Daniel Ryu
                        last edited by

                        Unrelated, but can the tracking camera take images with color or is it only grayscale?

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                        • Alex KushleyevA
                          Alex Kushleyev ModalAI Team
                          last edited by

                          The tracking camera (OV7251) is a grayscale camera, so it cannot sense color.

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