Media Glossary

• PTS - Presentation timestamp
• DTS - decoding time stamp
• I - Intra-coded picture - key frame
  • 不依赖前后帧进行压缩
• P - Predicted picture
  • 使用前面帧进行压缩
• B - Bidirectional predicted picture
  • 可使用前后帧进行压缩
• BDMV - blu-ray folder
• WHIP - WebRTC-HTTP ingestion protocol
  • https://github.com/ossrs/ffmpeg-webrtc/pull/1
  • https://news.ycombinator.com/item?id=36130191
• 参考
  • Video compression picture types
  • what are pts and dts ? https://stackoverflow.com/a/6044365/1870054

Audio

• ABX 测试
  • https://abx.digitalfeed.net/
• qaac - QuickTime AAC/ALAC encoder
• CVBR
• TVBR
• AAC-LC / LC-ACC - AAC Low Complexity
  • 主流
  • 常见立体声码率 128-192 kbps
  • 5.1 环绕声码率 320 kbps
• AAC Main
• AAC SSR - AAC Scalable Sampling Rate
• AOT - Audio Object Types
• ADIF - Audio Data Interchange Format
• ADTS - Audio Data Interchange Format

Qaac (Quicktime) 5.1-48KHz	2.0-48KHz
-V 1 AAC-LC 119 Kb/s	46 Kb/s
-V 9 AAC-LC 136 Kb/s	53 Kb/s
-V 18 AAC-LC 158 Kb/s	61 Kb/s
-V 27 AAC-LC 177 Kb/s	69 Kb/s
-V 36 AAC-LC 198 Kb/s	74 Kb/s
-V 45 AAC-LC 240 Kb/s	95 Kb/s
-V 54 AAC-LC 277 Kb/s	108 Kb/s
-V 64 AAC-LC 314 Kb/s	120 Kb/s
-V 73 AAC-LC 351 Kb/s	134 Kb/s
-V 82 AAC-LC 385 Kb/s	147 Kb/s
-V 91 AAC-LC 450 Kb/s	173 Kb/s
-V 100 AAC-LC 507 Kb/s	195 Kb/s
-V 109 AAC-LC 581 Kb/s	224 Kb/s
-V 118 AAC-LC 638 Kb/s	247 Kb/s
-V 125 AAC-LC 704 Kb/s	276 Kb/s