Audacity Forum

bat999 wrote:... It's not a wav file.

My bad
music_a.wav file is a wav file, but it contains a stream encoded with mp3 instead of usual pcm.

Alduin's Khajiit wrote:...attached problem wav

Hi
It's not a wav file.
Mediainfo shows it's an incorrectly labelled mp3 file.
Re-package it properly...

I don't understand what your Feature Request is? Hi It's not a feature request. If a version of Windows/Mac Audacity is released that can build with FFmpeg-HEAD, an updated Import/Export library will be needed to replace FFmpeg_v0.6.2_for_Audacity_on_Windows.exe and FFmpeg (0.6.2 OSX 10.4+ DMG) . H...

Hi These are the external libraries I've used when building an FFmpeg import library from FFmpeg-git with Audacity-svn r13155. I don't think any others are needed. 8-) --enable-libilbc enable iLBC de/encoding via libilbc --enable-libopus enable Opus de/encoding via libopus --enable-libspeex enable S...

Is -c:a the same as -acodec? For recent versions of FFmpeg, yes. I have not figured out the correct syntax to use for listing or setting - it just returns Unrecognized option 'sample_format' For me ffmpeg -sample_fmts shows name depth u8 8 s16 16 s32 32 flt 32 dbl 64 u8p 8 s16p 16 s32p 32 fltp 32 d...

Hmm
Audacity is able to export 24 bit PCM without FFmpeg.
File > Export Audio > Other uncompressed files > Options > Signed 24 bit PCM

Hello again :roll: If the file is exported from Audacity as a .wav file with ffmpeg -i - -c:a pcm_s24le -ar 48000 -ac 6 "%f" The result is pcm, 6 channels, 48KHz, 24 bits. So all the original parameters are now kept (including bit depth). And it could then be converted to dts or whatever with a "sui...

Doh
I needed to set Audacity ...

Preferences > Import/Export

"Use custom mix" instead of "Always mix all tracks down"

Now with FFmpeg
The final result is
dts, 6 channels, 48KHz, 16 bits.

... then use the "dca" (DTS Coherent Acoustics) encoding. Hi I had tried that, but when exported the result is dts, 2 channels, 48KHz, 16 bits. Maybe FFmpeg's dts encoder is not good enough. :? @Xubuntu:~$ ffmpeg ffmpeg version 2.2.git-3690393 Copyright (c) 2000-2014 the FFmpeg developers built on ...

@ Gale Yes, that's a good explanation. 8-) With a sample file from samples.mplayerhq.hu wget "samples.mplayerhq.hu/A-codecs/DTS/dts/Master%20Audio%205.1%2024bit.dts" mediainfo "Master Audio 5.1 24bit.dts" shows dts, 6 channels, 48KHz, 24 bits. When imported into Audacity using FFmpeg import library ...