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!
