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I currently have a DirectShow.NET graph that properly plays but I would like it to also be able to play in reverse (start at the end and play backwards to the start).
I’ve tried playing around with the IMediaSeeking::SetRate(double) method but that only works for positive values. When I try with a negative value it crashes.
Help!
I’m using .avi video files but would be open to trying different formats if that would do the trick.
Actually, I’m not sure that the stock AVI demux will support negative rates for any format, even if the format does not use temporal compression. And certainly most other demux filters will not support negative rate. So you will probably need a custom demux filter to do this. If you do this, make sure you use a container format with an index (mp4 for example).
If you use a format without temporal compression (motion jpeg, i-frames only mpeg-2 etc), you will pay a considerable price in frame compression in order to be able to play in reverse. If you want to do this really well, consider the approach taken by some DVD implementations. Some of them play in reverse by playing only the i-frame, so you have 1 or 2 fps. But the top-end implementation will decode a whole GOP (approx 15 frames) and will then render these frames in reverse order while decoding the previous GOP. This is expensive in development terms and in system resources, but gets a good end result.
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