[FFmpeg-user] Output video size depending on frame rate while creating video from image list
stephane.saffre at gmail.com
Mon May 9 22:55:34 CEST 2016
Sorry for that, the email was accidentally sent...
I am creating a video from a list of images and as the video frame rate is
not important in my use case, I have experimented with different frame
rates and noticed that the ouput video size changes a lot depending on the
chosen frame rate to reach a minimum size limit.
Here is the command I ran for different frame rates:
ffmpeg -framerate 60 -start_number 1 -i %d.jpg -c:v libx264 -r 60 -pix_fmt
> yuvj420p out-60fps.mp4
Here is some info on different output videos with different frame rate:
fps video size bit rate bit/frame
> 30 47368102 16841991 561399.7
> 60 37289465 26516952 441949.2
> 100 30917271 36642691 366426.91
> 1000 30917271 366426915 366426.915
The bit rate increase as expected with the frame rate but the number of
bits per frame decrease slowly to reach a certain limit (note that the
video size is the same for 100 and 1000 fps).
I did notice a small decrease in image quality between lower and higher
frame rates but I don't have a rational explanation to this. Do you have
any idea ?
Thank you for your help.
2016-05-09 22:47 GMT+02:00 Stéphane Saffré <stephane.saffre at gmail.com>:
> I am creating a video from a list of images and
> *Stéphane SAFFRÉ*
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