[Libav-user] how to predict the size of destination clips
Carl Eugen Hoyos
cehoyos at ag.or.at
Fri Jun 3 19:38:13 CEST 2016
qw <applemax82 at ...> writes:
> Hi,Does ffmpeg provide some function that can predict
> the size of destination clips before transcoding?
How would that work? (in theory)
Either you did set an (average) bitrate when starting the
encoder, then you know which value you chose and if you
also know the length of the input, you can calculate the
size of the output file.
FFmpeg generally cannot know the length of the input.
If you did not set a bitrate (but constant quality) then
it is impossible to calculate the output file size.
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