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This is why your computer details are important, because there seems to be something grossly wrong, electronically, when audio and video start to come out of sync a mere 20 seconds into it. By around the 30-minute mark (of a continuous, uninterrupted take) that's when loss of sync becomes obvious. This is my personal rough benchmark of how accurate the timekeeping abilities are when handling unknown equipment. Generally, we only become sensitive to loss of sync between audio and video when it becomes more than 4 or 5 frames worth, so the second method just redistributes the loss of sync in amounts too little to be noticed more or less evenly across the program.Ĭurrent prosumer equipment (camcorders and audio recorders) can generally be considered accurate enough such that when a random two (a camcorder and an audio recorder) are chosen, they can be expected to record a clip of about (in my experience) 10 minutes before they begin to slip by a frame or two (still too little to be noticed). Stretching (or compressing, temporally that is) wasn't done so it can be simpler. So, the second involves finding natural pauses and breaks in audio, splitting it at those points, then moving the cut clips to sync with the corresponding video at that point. Changing the audio this way can produce artifacts, though, and may be time-consuming the longer the involved clips are (2hrs or more). Then audio is stretched or compressed to the exact length of the video.
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The first involves examining the audio and video end to end to see the total time difference of the two, down to the last frame (or millisecond). For prosumers like us, getting rid of it falls in mainly two camps.
#Camtasia 9 audio out of sync professional#
In professional circles, all audio and video recorders receive a common sync, so timecode across all devices involved in recording a scene are the same and absolute. This problem is common, when disparate and separate devices are used to record audio and video. Then use mediainfo (tree view) to get details of the file produced by the olympus and and post those details here. First, please post computer details (hardware where audacity is installed (mainboard chipset, processor, memory, graphics, sound card details, including how the drum set is connected to it)).