how to convert mkv to mp4 ffmpeg losslessly

The problem with batch encoding is that there are no magic encoder settings that work for all videos, even if all the source files are the same resolution etc, which they probably aren't. But quality is a bit subjective and you'll have to decide for yourself if it's good enough. For DVD quality I'd go 16 or lower.Īs mentioned, you can't convert without losing quality unless it's to a lossless codec and no one wants that. mp4 isn't bad, just folks have been moving to mkv the last 6-8 yrs.Īctually I'd only consider 18 a high quality CRF factor if the source is high quality Blu Ray or similar. That can be handy for multiple audio streams or for captions in 10 different languages. mkv allows almost any sort of attachment in the container to go with the a/v streams. Plus, you might want to use mkv containers rather than mp4. For the most commercially accepted encodings, the video needs to be h.264 and the audio needs to be aac. It isn't a video or audio encoding standard. I've never used it with WMV files, but it works with pretty much all the other popular video formats, so it should work.īTW, mp4 is just a container. mkvmerge -o output.mkv input.wmv that's the base command. May be able to change containers without re-encoding. Low action videos can have higher 'quality' numbers. Different types of videos need lower (better) settings due to high-action. Try a few different levels, see what looks 'the same' to you. Lots of people use 21, but I see added artifacts at that level. 18 is an extreme quality - I thought 19 was extreme.

How to convert mkv to mp4 ffmpeg losslessly