[FFmpeg] usage

• transcoding

• ffmpeg -i input.rmvb -vcodec mpeg4 -b:v 200k -r 15 -an output.mp4

• -r: rate
• show signaling information

• ffprobe -show_packets input.flv

[Multi-media] FFmpeg Introduction

• FFmpeg
• name
• FF: Fast Forward
• frameworks (加上 prefix: lib, 即為對應的 library, e.g. libavformat, libavcodec, ...)
• AVFormat - mux/demux
• AVCodec - encode/decode
• AVFilter
• AVDevice
• AVUtil
• swscale (video)
• swresample (audio)
• binaries
• ffmpeg - encode/decode
• ffplay - player (depends on SDL)
• ffprobe - mm analyzer
• Reference
• (非常棒) [总结]FFMPEG视音频编解码零基础学习方法

[Codec] HEVC Study

• Resource
• Documents
• Standard
• ITU H.265 Standard
• Software
• Reference Software: HM
• Encoder: x265
• Viewer/Analyzer
• Intel Video Pro Analyzer
• YUVview
• Video Tool
• GPAC
• ffmpeg
• Reference test stream
• conformance bitstream
• Content
• Profile, Levels, Tiers (introduced in H265)
• Profile
• Main Profile < Main Still Picture Profile < Main 10 Profile
• Main 10 Profile
• 10 bits/sample for HDR, High color gamut, etc.
• Levels
• defines resolution, frame rate, bit rate, buffer capacity (e.g. dpb - decoded picture buffer), ...etc.

• Level	Resolution
  4	HD
  5	4K
  6	8K

• tier
• Main tier/High tier to distinguish the bit rates
• Syntax
• Patent fee

[Links] Fabrice Bellard

QEMU 與 FFMPEG project創始人 Fabrice Bellard. 其個人網站(project頁面)相當簡潔明膫阿! 強者! 目前計算 PI的紀錄保持人!

其他關於 Fabrice Bellard的介紹: 計算的威力, 智慧的傳奇