Warning: these are machine-generated results (not from real listeners) and hence should be taken with a grain of salt.
Codec Feature Comparison
| Codec |
Rate (kHz) |
bitrate (kbps) |
delay frame+lookahead (ms) |
multi-rate |
embedded |
VBR |
PLC |
bit-robust |
license |
| Speex |
8, 16, 32 |
2.15-24.6 (NB)
4-44.2 (WB) |
20+10 (NB)
20+14 (WB) |
yes |
yes |
yes |
yes |
|
open-source/
free software |
| iLBC |
8 |
15.2 or 13.3 |
20+5 or 30+10 |
|
|
|
yes |
|
no charge, but not open-source |
| AMR-NB |
8 |
4.75-12.2 |
20+5? |
yes |
|
|
yes |
yes |
proprietary |
AMR-WB
(G.722.2) |
16 |
6.6-23.85 |
20+5? |
yes |
|
|
yes |
yes |
proprietary |
| G.722.1 (Siren7) |
16 |
(16) 24, 32 |
20+20 |
yes |
|
|
yes |
yes |
no charge, but not open-source |
| G.729 |
8 |
8 |
10+5 |
|
|
|
yes |
yes |
proprietary |
| GSM-FR |
8 |
13 |
20+? |
|
|
|
? |
? |
patented? |
| GSM-EFR |
8 |
12.2 |
20+? |
|
|
|
yes |
yes |
proprietary |
| G.723.1 |
8 |
5.3 6.3 |
37.5 |
|
|
|
yes |
? |
proprietary |
| G.728 |
8 |
16 |
0.625 |
|
|
|
|
|
proprietary |
| G.722 |
16 |
48 56 64 |
? |
|
yes |
|
|
? |
? |
Definitions
- multi-rate
- Allows the codec to change bitrate dynamically, at any moment
- embedded
- A codec that embeds narrowband bitstreams in wideband bitstreams
- VBR
- Variable bitrate
- PLC
- Packet loss concealment
- bit-robust
- Robust to corruption at the bit level, as found on wireless networks
Special Features
- Speex
- Speex supports intensity stereo encoding and 32 kHz sampling
- iLBC
- iLBC frames are encoded completely independently; while this provides better quality when 10% (or more) of the packets are being dropped, this makes the codec suboptimal for clean line conditions.
版权声明：本文内容由阿里云实名注册用户自发贡献，版权归原作者所有，阿里云开发者社区不拥有其著作权，亦不承担相应法律责任。具体规则请查看《阿里云开发者社区用户服务协议》和《阿里云开发者社区知识产权保护指引》。如果您发现本社区中有涉嫌抄袭的内容，填写侵权投诉表单进行举报，一经查实，本社区将立刻删除涉嫌侵权内容。
