Invalid uncomressed images when recording from Unreal editor

[alonfaraj]

Bug report

• AirSim Version/#commit: 1.3.1
• UE/Unity version: 4.25.4
• autopilot version: N/A
• OS Version: Win10

What's the issue you encountered?

Recording uncompressed images from Unreal editor using rec button, output invalid images which can't be open when set "Compress": false.
When record compress images - it works fine.

Settings

Example:

  "Recording": {
    "RecordOnMove": false,
    "RecordInterval": 1,
    "Cameras": [
        { "CameraName": "0", "ImageType": 0, "PixelsAsFloat": false, "Compress": false },
        { "CameraName": "0", "ImageType": 5, "PixelsAsFloat": false, "Compress": false }
    ]
  }

How can the issue be reproduced?

1. Add uncompress camera to recording section in setting file
2. Record from unreal editor using 'R'
3. Check the images folder

[rajat2004]

This is a known bug, mentioned here - #2861 (comment)
Copied from the above linked comment - UE is doing the conversion to PNG format, and then we're just writing it as a binary file. For uncompressed, writing array values as binary doesn't work. I can see 2 options, either go for an external library such as libpng which will do the conversion and all (format's complex, so doesn't seem to be possible to write it ourselves), or use a different format such as PPM which is simpler and can be written similar to how PFM file is being written currently.
I haven't worked on it more since then, maybe will pick it up again, I guess PPM will be better than nothing, external libraries are somewhat painful to inlcude, especially for cross-platform.

[alonfaraj]

thank you Rajat Singhal (@rajat2004)