New answers tagged video-standards
Probably better suited for Stackoverflow but I think its still a valid question for this SE. Producing theora(ogg) versions of your videos is actually redundant. Any browser version supporting ogg is also supporting webm. For questions like these I recommend using caniuse.com. If you compare webm with ogg you quickly see that you cover the same browser ...
I would try cleaning the playheads (there are special tapes you can put in for cleaning) and/or checking the playback speed. Those are the two most common causes of that issue on my GL2.
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