The greatest video file size reduction by just processing the audio track is the size of the audio track itself, i.e. You can easily test my assertions by using stream copy function of the FFMPEG engine most of these converters use and copy out a sound track to a separate audio only file. The Video stream of any normal video, where the video is to be of any decent resolution and quality, is always going to take up magnitudes more space than the normal sound track unless you choose to encode the sound track as PCM-32bit 5.1 or 7.1 channel sound track. I am not debating with you but trying to educate you a little. Mike, take some time and learn a little rather than making things up as you go along.sound track for an hour long video file at 128Kbps mp3 stereo would be around 70MBytes. You are free to remain ignorant of course :-) removing the audio track and if you copy the video track the file size saved will always by relatively minimal except when the audio is uncompressed but the video is heavily compressed. I recorded 177 new registry entries in my Win7 32-bit VM, with HKCU
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