Hi guys,
We often blame CQMatic because it gives videos a little above the target. I personnaly use to do my prediction with an audio bitrate above the one I really want (160 for 128, 128 for 112...).
I just discover that the problem isn't in CQMatic but... in Calcumatic !
I have an other tool that is called "dvtool" and has an internal bitrate calc that I used today.
Let see what happened :
- I have a 116 min long movie that I predicted with Calcumatic for a 90min CD. With audio at 128, Calcumatic gave me a bitrate of 931.
- I encoded the movie normally with Cqmatic and this average bitrate of 931. The m1v was 809 Mb long.
- So I have 91 Mb left on my CD for the sound. I open DVtool to find what audio bitrate I can use to have a 91Mb long audio file. The tools give me : 112 ! And it also gives me the average bitrate for an audio at 121 :
929. For audio at 128 it gives me avg=
912

In sum : calcumatic gives for an audio bitrate of 128 the same avg that dvtool for audio at 112. And when I encode the file with Cqmatic and avg at 931, I have to encode audio at 112 to enter in my target.
Conclusion : Cqmatic is right ! That's Calcumatic that we need to change !
You can find dvtool there :
http://www.musclesoft.de/combatman/sindex.html