Opened 12 years ago
Closed 7 years ago
#1959 closed enhancement (fixed)
Support codec2
| Reported by: | Mathias | Owned by: | |
|---|---|---|---|
| Priority: | wish | Component: | avcodec |
| Version: | git-master | Keywords: | codec2 |
| Cc: | Blocked By: | ||
| Blocking: | Reproduced by developer: | yes | |
| Analyzed by developer: | no |
Description
Summary of the bug: Codec2 is a voice compression codec aiming towards very low bandwiths (below 5000 bits per second). Profiles exist for 3200, 2400, 1400 and 1200 bps.
I would suggest adding Codec2 to the list of supported ffmpeg audio compression and decompression codecs.
Codec2 is LGPL licensed and was designed to avoid patent issues.
URL for more information: http://codec2.org/
Change History (9)
comment:1 by , 12 years ago
| Component: | FFmpeg → avcodec |
|---|---|
| Keywords: | codec2 added |
| Reproduced by developer: | set |
| Status: | new → open |
| Summary: | Add codec2 to the list of supported voice codecs → Support codec2 |
| Version: | unspecified → git-master |
comment:2 by , 10 years ago
comment:3 by , 9 years ago
If you want to get access to some Codec 2 sample files I've posted the first 12 chapters of Sherlock Homes Audio book in Codec 2 format (.c2) here: https://lowbitnet.wordpress.com/2016/02/09/ultra-low-bit-audio-books/ - enjoy.
comment:4 by , 9 years ago
Another audiobook Codec2 file batch here - Do Androids Dream of Electric Sheep by Philip K. Dick: https://lowbitnet.wordpress.com/2016/02/10/ultra-low-bit-audio-book-do-androids-dream-of-electric-sheep/
comment:5 by , 9 years ago
How it this .c2 format related to www.codec2.org which supports multiple profiles?
comment:6 by , 9 years ago
Hmm, I'm not sure - I was just using an old windows compiled codec2 encoder binary provided here (https://github.com/mnasyrov/codec24net) which outputs files with the .c2 extension - at 2400bps I'm guessing (I talk about the process to do this here: https://lowbitnet.wordpress.com/2016/01/28/how-to-play-and-encode-codec2-audio-in-windows/).
I assume the different codec2 profiles were just different bitrates, similar to mp3 having different bitrates..
comment:7 by , 9 years ago
Unfortunately it is not, your files have nothing to do with original codec2.
comment:8 by , 9 years ago
Ok for what it's worth I've updated the audiobooks Codec .C2 files using the official source code from codec2.org (using the functions c2enc and c2dec which are documented in the readme file located at https://svn.code.sf.net/p/freetel/code/codec2/branches/0.3/README). Bitrates used are 2400 and 1400bps and should be mentioned on the audiobook pages now and in the file names. Profile used were the default of v0.3.
Turns out the previous windows binaries I was using were based on a 0.1alpha version of Codec2 and therefore not very forward compatible. Anyway should work now.
comment:9 by , 7 years ago
| Resolution: | → fixed |
|---|---|
| Status: | open → closed |
Fixed in f958f431eced497f42220d8f9890506215742512.
Are there actual samples anywhere?