Freemake Video Converter
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Full user review
"Not interested in software that doesn't work properly."
Can't think of any...it's free, you get what you pay for.
Didn't work properly
Tried converting a 3G MKV movie to avi. Not only did it come out in the wrong resolution, but the audio was out of sync. It actually made the movie smaller at full screen.
Then I ran the same procedure through Ultra Video Converter and it worked perfectly first time. No out-of-sync audio, and no change of resolution you didn't ask for. And yes, I did follow the procedure to ensure it didn't go out of sync, but it did anyway.
They shouldn't feel bad though because some other converters I tried (like Digiarty MacX HD Video Converter Pro (which I got a free key for)) also made the audio/video go out of sync, and it provided poor video quality while still having a large size (2G). Ultra Video Converter made the file 956Mb, and the quality is excellent.