However, I don't know how to use it correctly. I found that there is a -lossless option in x265. But in bulk conversion, how would I check each video manually? Is their some way that avconv can adjust CRF according to the input video intelligently? UPDATE-2 This is something which I have to check manually by converting small sections of the big videos. However, the problem is that for some videos CRF value of 28 is good enough, while for some videos, lower CRF is required. For example: avconv -i input.mp4 -c:v libx265 -x265-params crf=23 -c:a copy output.mp4 For better quality, I could use something less than 28. I found that crf is the knob I need to adjust. So, I need a method where avconv automatically adjusts whatever parameter needs adjustment, for each video. The thing is, I am doing a bulk conversion. Do I need to modify the crf parameter in my command line? Or something else? one movie print which is of 5GB) loses quality - the video is all pixelated. However, a few videos which are of very high quality (e.g. Now, most videos convert fine and the quality is the same as before.

#Output new files by prepending 'X265' to the namesĪvconv -i '$i' -c:v libx265 -c:a copy X265_'$i' I ran the following command on all of the video files in my library: #!/bin/bash I am trying to convert my video library to HEVC format to gain space.

Ffmpeg nvenc h265