I created a new video file using OpenShot to make sure I'd have a video file that OpenShot / MLT was happy with. Then I tried the same thing... added the new video clip, took just a section of it, tried to reverse it, and got the same result, where it just showed a black square instead of the reversed video. I'm using MLT version 0.8.8. And as I said, the video file I used as a test was created using this library.
I created a new video file using OpenShot to make sure I'd have a video file that OpenShot / MLT was happy with. Then I tried the same thing... added the new video clip, took just a section of it, tried to reverse it, and got the same result, where it just showed a black square instead of the reversed video. I'm using MLT version 0.8.8. And as I said, the video file I used as a test was created using this library.