[Ffmpeg-devel] [PATCH] AC-3 encoder volume
Justin Ruggles
justinruggles
Mon Mar 19 00:19:16 CET 2007
Michael Niedermayer wrote:
> Hi
>
> On Sun, Mar 18, 2007 at 04:51:19PM -0500, Justin Ruggles wrote:
>
>>Hi everyone,
>>
>>This bug has been bothering me for a while. The AC-3 encoder is
>>producing output with too high volume, which even results in clipping in
>>many cases.
>>
>>The attached patch fixes the problem and updates regressions. Here is a
>>little history. Revision 5281 changed v-8 to v-9. Revision 7160
>>changed v-9 to v-10. But after that change I've found the resulting
>>file to be noticeably too loud when played.
>>
>>To avoid basing the argument on my ears, I've attached a comparison I
>>did with a mono clip of a 1kHz tone at 85% of full dynamic range. The
>>screen shot shows 3 different files in Audacity. The top box is the
>>original file, offset by 256 samples to account for the AC-3 delay. The
>>middle box is the results from encoding _without_ the patch, then
>>decoding with a52dec. The bottom box is the results from encoding
>>_with_ the patch, then decoding with a52dec.
>
>
> patch ok, and please cite the whole commit message of the commit this
> reverses (with revision number ...) in the new commit message
applied. that was one long commit message...
More information about the ffmpeg-devel
mailing list