Hello all,
By providing to ffmpeg (release 6.1) or ffprobe (release 6.1) :
-> the path of a audio-video source file ;
-> the parameters envisaged for re-encoding (audio+video codecs, audio+video
bitrates, scale criterias) ;
is it possible to know an assessment of the size of the final file (the file
obtained by re-encoding the source file) ; without actually re-encoding ?
If so, how do we need to proceed ?
Are there additionnal parameters required to make the assessment, and which
ones ?
Thanks for your help and your advices.
Regards,
HA
Well No, unless....
Depending on the Codec you can set a specific size to aim for. Using
dual or triple encoding passes you will get a video of that size with
the best possible quality for that codec with the criteria you specified.
Otherwise when aiming for a certain quality there is no way to predict
the actual filesize as it differs with the content of the video.
When using a fixed bitrate, then you can calculate the resulting size
exactly, if the codec sticks with it. But several codecs will use
smaller bitrates if the specified bitrate is higher than needed for the
content, or raise the bitrate temporarily if needed to accommodate
content needing it. Most modern codecs allow to set margins for the
specified bitrate.
Really, read the documentation about encoding and for the codecs you
wish to use!
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