Unsure what you mean by 'downloaded videos' here. I have downloaded videos on occasion and they have ran OK. I have tried playing the videos when nothing else is running but that doesn't seem to rectify anything. The videos are on an external USB hardrive. Unfortunately that hasn't sorted anything out. I have repaired permissions using disk utility and it has rectified some minor issues. Not sure if your issues might be similarly connected or not. I used to leave my system on 24/7 for iTunes-TV access but am finding that frequent re-boots of the el Capitan system seems to 'clear' many of the slowdown issues I am experiencing.

On a personal note, my I7 iMac operating under El Capitan also seems more prone to 'slowdown' issues than previous OS versions.

In short, choppy video playback is often just a symptom of other, more serious system problems. stored on an internal/external USB/Firewire/Thunderbolt DAS/local network/internet drive, etc? What other applications and/or processes are simultaneously running? Check the 'Activity Monitor' to see if any apps or processes are 'not responding' and/or creating data bottlenecks and/or abnormal 'hogging' of CPU, drive read/write, or network work cycle allocations. (QT automatically drops frames if/when it cannot keep up with playback requirements which can create choppy playback issues to complete 'freeze' of playback.) Are you trying to play normal SD, HD, 2.5K, 4K, 5K or larger resolution formats? What video codecs are you using and at what data and/or frame rates? How are the files stored/being played back-e.g. The first step here would normally be to determine the nature of the problem-i.e., is the problem due to the file playback requirements of the files themselves or due to a problem within the system itself.Ĭheck the files for bandwidth requirements and compare them with system capabilities.

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