As an output option it is very precise but takes a considerable amount of time to decode all the stream before the specified time, and for testing purpose you don't want to waste time As an input option it is less accurate (because seeking is not accurate in most container formats), but takes almost no time. Note that if this parameter is given after the input file and before the output file, it becomes an output option and tells ffmpeg to decode and ignore the input until x seconds, and then start writing to output.
For most videos (be it WMV, or MPEG, or AVC/H.264) I use crf=23. With that out of the way, I'd like to share my experience with x265 encoding. Most x265 switches (options with no value) can be specified like this (except those CLI-only ones, those are only used with x265 binary directly). In FFmpeg you can pass the parameter like this: ffmpeg -i INPUT.mkv -c:v libx265 -preset ultrafast -x265-params lossless=1 OUTPUT.mkv Not sure about avconv but the command you typed looks identical to what I do with FFmpeg. I tried using it in the following manner but it yielded opposite results (the video was even more pixelated): avconv -i input.mp4 -c:v libx265 -x265-params lossless -c:a copy output.mp4įrom my own experience, if you want absolutely no loss in quality, -lossless is what you are looking for.
#Xmedia recode command line how to
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?
#Xmedia recode command line movie
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.
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