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5

Using one of these solutions will be more efficient. That's what you've asked for. It saves you time, because there's no more need to manually sync the presentation and the voiceover. Free Solution Keynote can record a running presentation with the mic-audio. QuickTime X has also a screenrecord-feature incl. audio. Low Cost Solution Specialized ...


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The professional way Professionally done, all cameras and audio recorders will have a running (SMPTE) time code, which can be configured in 'free run' mode - meaning the time counter runs regardless whether we record or not (ie, STOP mode). At the beginning of the shooting day, all recordists (cameras, audio) will sync their clocks. This is done either to ...


3

You are looking for a Non-Linear Video Editing packages or NLE. Premiere and Final Cut Pro are two of the most popular, but they are also relatively pricy professional products. There are also many cheaper and/or free options available such as Windows Movie Maker (Windows) or iMovie (Mac). If you search for non-linear editing software or video editing ...


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I have no idea if this is optimal for you, but one approach using free software would be to first determine the percentage (and direction) of drift by finding a point near the end where you can tell with some precision what the sync error is, in frames. Demux the video and audio into separate streams, using a free tool like AVI-Mux. Load the audio into ...


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Yes. The companies Spatz-Tech, HDFury and Faroudja have products with that functionality in their portfolio. But there are selling restrictions in many countries.


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There is no way to do this automatically. It has to be done manually by matching the frames together from the two videos. This can be done by placing the videos in separate overlay tracks and works for two or more videos.


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Regarding @rich's suggestion... if you don't have Quicktime, will iMovie work instead? Or some other program? Create your Keynote presentation. Record your speaking part (separately) with an audio recording program. I recommend Audacity. It's a great free application. You can download Audacity from www.sorceforge.com among other places. You'll also want to ...


2

It should be. You might end up with impedance mismatches that have to be dealt with, so it might take a few other (relatively cheap) steps to get there (devices called pads, which bring down the level), but it should work. The quality might not be quite as good though.


2

Haha! In movies about movies you always see this clap in the beginning of a shot. The one where the take number and everything is written on with chalk. And they hold it in front of the cam and make one loud clapping noise with it. Well, if you have ever wondered what this ritual is for, congrats! You have found the problem to the solution ;-)) You get a ...


1

A clapper is the easy approach for your budget since it will provide a synced audio/video event that can be heard on the audio and seen on the video. The main problem you might run in to however is that many cellphone video cameras are not fixed frame rate. If they do not capture with a reliable and accurate timecode then syncing up after the fact will ...


1

You can tell which one gets out of synch like this: Set up your camera and your phone like you usually do. Put a clock that shows seconds right in front of the camera. Then, even though this sounds boring, record yourself counting off the seconds. Synchronize the video and audio in Premiere Pro like you usually do. When they get out of synch, check whether ...


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There are any number of possibilities, but the most likely ones all involve getting better equipment. The most severe sync problems with phones tend to come from phones that use variable framerate video or tend to have cheap encoders that tend to drop or delay frames. When you are recording video, each frame has to be recorded more or less in real time. ...


1

The most common cause of this kind of asymmetric drift is dropped frames. With older equipment, there were sometimes inconsistencies in the internal clocks that would result in issues that time didn't flow at a consistent rate between samples, but most decent modern hardware, while it may have slightly different rates, is inherently stable at that rate. ...


1

I have a similar problem and that's how I found your question online today... The Mp4 file from my nx1000 was imported as it is on adobe premiere cs3. The audio and video seem to have same starting and ending point, but the video alone is faster than the original as if it was stretched, and the audio has the normal speed but ends in the middle of the ...


1

There is a plugin called vocalign that will do this. It is designed mainly for aligning vocal overdub and replacment dialog but it should work for what you are doing. You can use it as a VST in audacity. It isn't cheap but, if my memory serves me correct, it has a fully functioning demo. http://www.synchroarts.com/index.php?PAGEID=products&ID=vocalign


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As @DoktorHauser mentioned. Using one of the tools he mentioned would actually solve your problem. I don't really understand why you recorded your voice separately, if the point was to bring the video together with the audio. In that case it would have been much easier to record the audio with the video. (ScreenFlow, Camtasia and any of the tools mentioned ...


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Assuming you don't need great quality and are ok with ip camera quality footage (which it sounds like you are), you could pick up several wireless ip security cameras and connect them via WiFi on the same network as a Mac laptop running Security Spy.


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Use mkvmerge with -y or --sync Synchronize, adjust the track's timecodes with the id TID by 'd' ms. 'o/p': Adjust the timecodes by multiplying with 'o/p' to fix linear drifts. 'p' defaults to 1 if omitted. Both 'o' and 'p' can be ...


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I know this is a very old Q, but it should be pointed out that a 'negative timecode' makes no sense. The SMPTE frame before 00:00:00:00 is 23:59:59:29. The namespace for drop frame (and non-drop) codes is already well-defined -- no need to postulate negative values. If there are systems or programs that use this notation, they should be rethought.


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Taking into account that frame dropping works on a 10min-regular basis project offsetting by a multiple of 10min should keep frame dropping at the same positions I guess the correct way of doing this is on a regular basis.



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