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Dropped Frames
The default dropped frames interface that comes with DirectShow is broken, I have created a new Dropped frame detection method that should be a lot more accurate then the default one. The new dropped frame system shows up under Dropped2 in the capture stats, it also makes available the frame numbers that were dropped be selecting "Show Dropped Frames" from the capture menu after a capture.Dropped frames can occur for a number of reasons, CPU, Hard Drive or some other system resource overloaded with data etc can cause frames to be dropped, in this situation frames are dropped because the PC can not process all the frames fast enough and has to drop frames to keep up.
The other reason frames can be dropped is if the input signal is to degraded for the capture card to detect the frame correctly, in this situation the capture card can not digitize the frame and thus it is lost. You will see this happen when capturing from Video Tape that is old or worn.
In all situations a blank frame is inserted into the AVI index thus when you go back over the video you just captured you will see dropped frames as one or more frames of the same image etc. This also stops the video from playing faster or slower you just get duplicated frames in your AVI file.
To check a captured AVI file for dropped frames use VirtualDub to open the AVI file and then under one of the menus select jump to next dropped frame, you will then be shown the next dropped frame in the AVI file if there is one. This is the best way to check for dropped frames after you have captured a file.