![]() The article he quotes mentions using multi-pass conversion, which is a good way to achieve better compression without sacrificing quality. ![]() Marty Jay helpfully mentions that sameq means same quantizer as in the input, which may not result in the same quality. The last time I transcoded video I used qscale=8.0, but I'd suggest that you experiment to find the optimum to match the quality of your input. The lower the number the better the quality, but the more space your file will take. Alternatively, you may want to use the qscale option to set the quality manually. I hope you can use zetah's suggestion above in his comment and use the -sameq switch. The easiest way to do this is to install a file reader plugin that uses FFMPEG internally to decode the data. Audio is played by using codecs like MP3, AC3, MS. The video works with the help of different codecs: DivX, XVID, WJPEG, and many others. AVI format files use a broad range of various codecs. Such files are responsible for alternating audio and video. The solution is like many pointed out, to use FFMPEG that will work with anything. An AVI file is a multimedia container that is very popular among PC users all around the world. If you must transcode because you need to use a particular video codec So while the file has an AVI extension apparently supported by ImageJ / Fiji, the content is unreadable. codec:copy may be helpful if you don't have a reason to transcode (and it should be faster). You always lose a little quality whenever you transcode from one codec to another, video or audio, but perhaps you can avoid it if you only want to change from MP4 container type to an AVI container.
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