[Ffmpeg-devel] FLAC encoder
Fri Jun 2 09:15:52 CEST 2006
Justin Ruggles wrote:
>>Well, the FLAC encoder is getting better by the day. I'll post some
>>results some time soon of my most recent version, which has marked
>>improvement in compression.
>Here are some current results. The latest version is here:
>I still haven't integrated with FFmpeg...that's coming soon though. The
>biggest improvement I have made is the application of a window function
>before calculating the LPC coefficients. After testing several
>different window types, I found that for most audio clips, either the
>Hamming window or the Bartlett window was the best choice. So I changed
>the encoder to calculate LPC coefficients using each of these windows.
Regaring the choise of window, read this thread:
Hope it helps.
>Optimal LPC order estimation is done for each set, and the smaller order
>of the 2 is used along with the corresponding coeffs. It's amazing how
>such a simple thing can increase compression so much! I got the idea
>from a general description of MPEG-4 ALS. It could be patented for all
>If anyone wants to do tests with the clip I used for the test below:
"incorrect information" is an oxymoron. Information is, by definition, factual, correct.
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