Registered Member
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I'm making music videos with still images for YouTube.
I have e.g. 20 *.png images that I then put in the timeline with a background audio, etc. I did a 4 minute video at 720p and its size was 120 MB. I then uploaded it to YouTube (took one hour and a half). Then, using some websites to download videos from YouTube, I downloaded my own video and it was 25 MB only with the same quality and resolution. So it's clear that slideshow-type videos do require some specific settings to make the software understand that it is dealing with the same image for seconds. I've tried enabling "second pass" but it didn't help. So, since I don't want my uploads to take that long anymore, I'm asking here what setup could give me a decent-sized output file for a slideshow-music-video. Thanks. |
KDE Developer
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You shouldn't use constant bitrate (for which the 2nd pass exists to improve accuracy).
Then in variable bitrate (constant quality) try to play with the quality factor (eg 25 to 30 with x264) and if your images stay more than few seconds then increase the GOP size (g= maximum image length in frames). You may reduce the image frame rate too (create a new profile for that, if there is no motion 1 to 5 fps may be enough ?) but I don't know if youtube accepts that. |
Registered Member
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Thank you. Problem is I'm on Xubuntu 14 LTS so I only have version 0.9.8 of Kdenlive. So I don't have those options.
I could do a new profile and change the command line parameters. What could I try? Any documentation on that? |
KDE Developer
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You can create a profile with extension mp4 and parameters :
properties=x264-medium f=mp4 vcodec=libx264 acodec=aac g=200 crf=27 ab=128k I hardcoded parameters for simplicity, you can adjust your profile to your taste - crf is quality factor, lower is better but bigger, with 20 almost lossless but huge, 35 highly compressed - g is group of picture size, maximum number of frames before recoding a full frame (higher gives more compact files, but difficult to seek) - ab is audio bitrate I don't remember if aac is supported in old MLT/FFmpeg, maybe you will have to infer from other similar profiles |
Registered Member
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