If you need the output to be playable in non-FFmpeg based players add -vf format=yuv420p : ffmpeg -i input.mov -crf 18 -vf format=yuv420p output.mp4. You may notice a slight reduction in color fidelity, but it is required for wide compatibility. You can omit -vf format=yuv420p if you're uploading to YouTube.
If you need better quality in a smaller size then you need to convert using higher quality original masters. You can change the container such as mkv or mp4 without losing data. If you are using a particularly inefficient container format then you might save a small amount of space that way, but it is going to be insignificant compared to the
To bypass MKV compatibility, you can use the free VLC Media Player program to convert the .mkv video format to .mp4 video without loosing MKV's video quality. Related article: Convert MKV to MP4 by using MkvToMp4 converter. In this tutorial you can find detailed instructions on how to easily convert any MKV video file to an MP4 video by using Step 4 Convert M2TS to MP4 without losing quality. Click the Convert or Start All button to start converting M2TS to MP4, and then you can get your MP4 videos after several seconds in the Finished tab. Tips: You also can create a custom format to customize advanced audio and video parameters such as size, frame rate, bit rate, etc. Generally 1. First, open this tool and add your MKV files to the Video Compressor section. Even if MKV is not written in the supported format, it is feasible, and the effect is not affected. 2. And then, you can get your videos ready for compression. However, we recommend that you use our default settings that have been optimized for efficiency and quality. Step 3 Starting Convert MKV to M2TS without quality loss. Before converting the MKV file to M2TS, you can change the output folder's location for your convenience. When you are ready, click the Start All button to start the process. 2EfD.
