Bug 505314

SUMMARY
When loading a video file that contains two video streams (like some 360 cameras produce), Kdenlive can't seem to show the second video stream.

STEPS TO REPRODUCE
1. Load a clip from a 360 camera, like this one:
https://drive.google.com/drive/folders/1Os565ZkoYKHnWckZmSsjQT1vpzGDRmMq
"VID_20240414_135511_00_027" is the raw file, with 2 video streams, one for each camera.
"LRV_20240414_135511_01_027" is a proxy file, showing both cameras side by side in low-res.

2. After loading "VID_20240414_135511_00_027" file, Kdenlive detects the presence of more than one video stream in it, but in the dialog to let the user load the extra streams, only one (the first one) is shown.

3. Two clips are created in the Project Bin, but both of them show video stream 1.

4. If the user goes to Clip Properties > Properties and tries to force one of those bin clips to show the second stream, the drop-down menu shows two streams, but after selecting the second one, it revers back to the first stream (never showing the second one, even for a short period).


EXPECTED RESULT
1. To have two clips in the Project Bin, each one showing one of the cameras recorded.

Thanks!!