geni geniice at gmail.com wrote: Mozilla is quite responsive. (I fixed quite a few video bugs prior to release) But in this case there doesn't appear to be any real firefox problem. You've got a >6mbit/sec Ogg/Theora file. The stalling is because firefox doesn't prebuffer and your connection isn't fast enough to get ahead of it. Once the file is transferred moving the playhead back to the start gives smooth video. Prebuffering can be achieved by setting the autobuffer parameter before playback begins. The current way video is launched by the site defeats that. Other playback methods will hold the initial playback until some buffer has filled, so they don't exhibit the same behavior. This situation can be improved by managing the buffering process using JS or simply making good use of autobuffer. But the real flaw here is expecting a 6mbit/sec file to stream… Unfortunately until we have some trans-coding infrastructure that will remain a problem. I was thinking about running a bot to take all uploaded videos shrink them to 480px (if larger) and encode at reasonable streaming friendly bitrates, then uploading back as filename_thumb480 and replacing them in articles.  I'm not sure how people will feel about that but it will greatly improve video playability without encouraging people to upload at low qualities which are completely unsuitable for editing.

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