MP4Cam2AVI is a MP4/MOV/M2TS to AVI repackaging tool for digital photo-video cameras, it makes their clips editable in VirtualDub, MovieMaker and other AVI editors. Also it can combine (join) multiple clips from camera into a single AVI movie, preserving audio/video sync.
No video recompression (by default), no quality loss, fast operation (5-20x realtime). No installation needed - just download, unzip and run mp4cam2avi.exe.
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I have experimented with this program in order to test the option of converting MP4 files to the AVI container for use with VirtualDUB. When I tried to convert an MP4 video to the AVI container using this program I found that after the conversion the sound was badly distorted using both the 'Source Audio' and the 'LAME MP3 Best Quality' settings. However, when performing the same operation using ffmpeg from the command line I had no problem with audio and the picture appeared to be undistorted. Here is the command that I used: ffmpeg -i "[input]" -flags +global_header -vcodec copy -acodec copy "[output]" The version of ffmpeg that I used was: ffmpeg-20160227-git-5156578-win32-static Considering that this program is just a frontend for ffmpeg it ought to be able to handle sound competently. I suggest that the author re-writes this program to use ffmpeg on the users system, but this is unlikely to happen because I am sure that he has long since lost interest in it.
The best way to convert AVI to Apple ProRes on Mac is Avdshare Video Converter, you can have a try
Audio not syncing even with advanced options.
Today we could say avi format that is being considered as output format is obsolete. All the video editors, web browsers and mobile devices can play the subset of mp4 format. So I prefer another converter, Mp4 Video 1 Click (search at sourceforge or google it). It accepts video in any format and generate mp4 file that is playable by all the browsers and all the devices. Also It does all the conversion in exactly one mouse click.
You can use Avdshare Video Converter to convert MOV to AVI, MP4, WMV, Apple ProRes, AVCHD, DV, MKV, VOB, RMVB, FLV, WebM, etc.