Fixing Blury Rendering in Kdenlive


Many people, including me, have problems with kdenlive producing blury videos. This is how I solved it.

The original video had this encoding:

$ mpv foo.mp4
 (+) Video --vid=1 (*) (h264 2560x1440 25.000fps)
 (+) Audio --aid=1 (*) (aac 2ch 48000Hz)
AO: [pulse] 48000Hz stereo 2ch float
VO: [gpu] 2560x1440 yuv444p
(Paused) AV: 00:00:09 / 00:45:36 (0%) A-V:  0.000

It's then important to choose a rendering profile with the same: - 2560x1440 screen resolution - 25 frames per second - A codec that doesn't ruin everything (the original used H264)

I first choose WebM, which produced blury output even though the resolution and FPS were correct. I then chose the one called MP4, which had the following options if I double clicked on it:

f=mp4
movflags=+faststart
vcodec=libx264
progressive=1
g=15
bf=2
crf=%quality
acodec=aac
ab=%audiobitrate+'k'

The video codec libx264 sounded quite similar to h264 that mpv listed when playing the original, so I wagered this being a good bet.

And lo and behold, it was! The rendered video turned out sharp and crisp.

Happy rendering!


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