[Cs-dev] Dither Problem in Csound5
| Date | 2008-10-06 17:31 |
| From | Jim Bates |
| Subject | [Cs-dev] Dither Problem in Csound5 |
I have done a number of tests with Csound5 version 5.08 doubles and 5.09 floats on OSX10.4.11 and LinuxSUSEppc and the dither option is not working. When called from the Csound5GUI or from the command line, with the -Z flag, there is no detectable dither added to files that are essentially 10 seconds of silence. I viewed the results using Audacity version1.3.5d, in the Waveform(db) mode, which gives resolution down to -145 db. It's totally flatline. I had Steven Yi test it as well on his linux system, with the same result. Given the importance of dither, especially in the doubles version, this is kind of crucial. All the Best, Jim Bates ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Csound-devel mailing list Csound-devel@lists.sourceforge.net |
| Date | 2008-10-06 19:47 |
| From | "Steven Yi" |
| Subject | Re: [Cs-dev] Dither Problem in Csound5 |
| Attachments | None |
| Date | 2008-10-07 14:32 |
| From | jpff |
| Subject | Re: [Cs-dev] Dither Problem in Csound5 |
The dither on output is handed of to libsndfile, so we need to know what type of output you are creating and what version of libsndfile you have. ==John ffitch ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Csound-devel mailing list Csound-devel@lists.sourceforge.net |
| Date | 2008-10-07 14:37 |
| From | jpff |
| Subject | Re: [Cs-dev] Dither Problem in Csound5 |
> The dither on output is handed of to libsndfile, so we need to know > what type of output you are creating and what version of libsndfile > you have. and what type of soundfile you are writing. I note that in libsndfile it states "Rule number 1 is to only apply dither when going from a larger bitwidth to a smaller bitwidth." ==John ffitch ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Csound-devel mailing list Csound-devel@lists.sourceforge.net |
| Date | 2008-10-07 22:40 |
| From | Erik de Castro Lopo |
| Subject | Re: [Cs-dev] Dither Problem in Csound5 |
jpff wrote: > The dither on output is handed of to libsndfile, so we need to know > what type of output you are creating and what version of libsndfile > you have. Errr, but John, libsndfile does not (yet) do dithering :-). Erik -- ----------------------------------------------------------------- Erik de Castro Lopo ----------------------------------------------------------------- "The music business is a cruel and shallow money trench, a long plastic hallway where thieves and pimps run free, and good men die like dogs. There's also a negative side." -- Hunter S. Thompson ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Csound-devel mailing list Csound-devel@lists.sourceforge.net |
| Date | 2008-10-08 08:15 |
| From | jpff |
| Subject | Re: [Cs-dev] Dither Problem in Csound5 |
Hum.... after the last message I looked at the sources and came to that conclusion, but was waiting for your confirmation. Could I request that this facility be implemented? We call the functions for it already. Alternatively I could reinstate the not-good dithering I wrote for csound4, but it was not good. ==John ffitch ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Csound-devel mailing list Csound-devel@lists.sourceforge.net |