[FFmpeg-user] optimized bitrate

[Hugo Wau]

Hello,

I have made now some tests with the "-qcomp 0.7" option versus the "-b 
4000k" option and did not notice any difference in the results. Both 
videos were reduced in size as I had wished it would be.
I found out, that I had to put the -b option at the front of the command 
line, directly following the ffmpeg command, while the qcomp option hat 
to follow the modifiers of the video codec (near the end of my command 
line).

Now I would like to have a (Linux) bash script, where the right bitrate 
is calculated from the length of the audio or from the number of the 
single images, from which the video is made. I think that some formula 
to calculate the bitrate for the -b option for ffmpeg must exist already 
in the public domain somewhere, but I have not found it yet. (Something 
for my very low level of understanding since I am far from being a video 
or DVD or ffmpeg Expert).

With kind regards
Hugo