lavfi-preview
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displaymatrix handling
I tested lavfi-preview with a file source that happened to have the following side data attached to the video stream according to ffprobe:
Side data:
displaymatrix: rotation of -90.00 degrees
This was not honored in the playback. I am not aware of how ffmpeg normally handles this. But just in case this is something you instead of the lavfi-preview user should be handling, hereby i've reported it ;) Else just close this.