YUV frames have distorted colors after rebooting M350

[wooldridgetm]

YUV frames retrieved using MediaDataCenter CameraStreamManager have color distortions, which are delineated below.

This is how we're retrieving the YUV frames.

MediaDataCenter.getInstance().cameraStreamManager.addFrameListener(
    ComponentIndexType.LEFT_OR_MAIN,
    FrameFormat.YUV420_888,
    this
)

override fun onFrame(
    frameData: ByteArray,
    offset: Int,
    length: Int,
    width: Int,
    height: Int,
    format: FrameFormat
) {
    if (frameData.size < width * height) return

    // process the byte array
    processor.onFrame(frameData, width, height + offset, formaț, isDirect = true)
}

Steps to Reproduce:

1. boot up M350 and connect it to the RC Plus
2. Run the MSDK sample app
3. click on testing tools
4. click on Multi-Video Decoding (CameraStreamManager - New)
5. w/o relaunching the app, reboot the M350 at least 3 x's.
6. capture the image.
7. examine the image - you will see that the colors do not align correctly.

[dji-dev]

Agent comment from yating.liao in Zendesk ticket #116342:

Is the MSDK version you are using 5.8? This is a known issue with version 5.8. Please try the latest version.

°°°

[wooldridgetm]

Thanks; we're using v5.9.1. I will try to reproduce on v5.10.0 and report back.

[dji-dev]

Agent comment from yating.liao in Zendesk ticket #116342:

Thank you for your understanding.

°°°

[wooldridgetm]

We tried the latest SDK with the M350 using the steps delineated above - we still see the same issue. Please advise.

[dji-dev]

Agent comment from yating.liao in Zendesk ticket #116342:

I tested on the M350 using the method you described, and I did not encounter a similar issue. Did you use the correct photo dimensions when viewing the YUV images? The ReceiveStreamListener will push the width and height.

°°°

[wooldridgetm]

We're using the width, height, and offset from the CameraFrameListener; we're not using ReceiveStreamListener.

[dji-dev]

Agent comment from yating.liao in Zendesk ticket #116342:

The width and height obtained by CameraFrameListener and ReceiveStreamListener are the same. Would you be willing to share the file you tested with us?

Here is an upload link:https://pan-sec.djicorp.com/s/y6A8L55a84iEp4B password:dji123

°°°

[wooldridgetm]

I uploaded the sample apk named wooldridge-dji-yuv-problem.apk along with the zip file dji-sample-app.zip - this is the source code used to create that apk.

Instructions:

1. Turn on a RC+ and M350 with an H20 attached
2. Uninstall any existing versions of the MSDK Aircraft app on the RC+.
3. Install the wooldridge-dji-yuv-problem.apk on the RC+.
4. Launch the newly installed app.
5. Click on Testing Tools
6. Click on Multi-Video Decoding (CameraStreamManager - New)
7. Restart the drone several times w/o shutting down the app.
8. Click capture
9. This saves the YUV frame in an i420 format as a file in the Downloads directory on the RC+.
10. The app now displays the adb command to copy that file from the RC+ as well as the width/height reported by CameraFrameListener
11. Copy that newly created file from the RC+ using the adb command delineated in the app.
12. Examine that file using pixpeep.mort.coffee in your browser
13. Choose the file you copied over in step 11 and enter i420 as well as the width/height reported in step 10
14. If you don't see green bars or misaligned colors, then restart the drone w/o restarting the app and repeat steps 8 - 13. Sometimes, it takes 6 drone restarts for this to occur, but it usually only takes 1 or 2 drone restarts.

[dji-dev]

Agent comment from yating.liao in Zendesk ticket #116342:

I have reproduced the issue you mentioned using H20. It seems that this problem does not occur with the FPV lens.

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