[FFmpeg-user] Reducing video file size

Morten W. Petersen morphex at gmail.com
Mon Nov 4 18:47:55 EET 2019

Hi Daniel.

I would say a smoother flow is more important than resolution.

For now.


man. 4. nov. 2019, 17:39 skrev Noeck <noeck.marburg at gmx.de>:

> As others pointed out, this very much depends on what you want to
> achieve (besides a small file size). But I try to offer a starting point
> for you to try and find your own compromise of size and quality.
> Usually, I would use a resolution of 1920x1080 (HD), but 1280x720 might
> be an option to reduce the size. A frame rate of 25 frames per second
> could be enough. But with typical codecs you will not get half the file
> size by using half the frame rate. So 720p and 25 fps could be a
> starting point. What is more important to you: a high resolution or a
> smoothly moving image?
> Then the vp9 codec (libvpx-vp9) and opus audio does a good job regarding
> bitrate and a high CRF value reduces file size. Just try 32 and have a
> look if you can tolerate the quality reduction and file size.
> And only as a last resort go below a 480 resolution and 25 fps.
> Audio bitrate is typically much smaller than video and there is not a
> log to gain here. But with the opus codec you can go as low as 64kbit/s
> if need be.
> Of course there are many more ways to reach a small file size. The
> numbers above are in the ball park of what could be reasonable for a
> small web-quality video.
> Best,
> Daniel
> > Resolution
> > Frame rate
> > Color encoding
> > Compression/encoding
> > Audio bit rate & compression
> > (others)
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