2020/Austin/video

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Video was a session at IndieWebCamp Austin 2020.

Notes archived from: https://etherpad.indieweb.org/video


IndieWebCamp Austin 2020
Session: Video
When: 2020-02-22 15:30

Participants

Notes

A video has frame rate, resolution, and codec

  • Frame rate - 60fps, 30fps, 24fps, etc
  • Resolution - how many pixels to store
  • Codec - usually codecs will store only the changes in the image data
    • webm - open source codec from google
    • h264 - most common codec, supported everywhere
    • hevc x265 - same quality for half the file size, but requires newer devices
ffmpeg -i video.webm -c:v libx264 -crf 22 -c:a aac -b:a 192K output.mp4
  • -i video.webm input file
  • -c:v libx264 - use this video codec
  • -crf 22 - 22 is baseline. 28 is variable bitrate.
  • -c:a aac - audio codec
  • -b:a 192K - audio bitrate

Hosting videos

  • Ben hosts on S3, which is cheap, but then uses CloudFront in front which is more expensive but improved latency for people dramatically

Livestreaming

  • HLS is the industry standard. playlist format, shows which videos are available. you can make multiple bitrate versions available in this list.
  • HLS players will know what bitrate they can download, and can switch streams
  • each item in the playlist is a set of h264 files ending in .ts
  • mediafilesegmenter - takes a video file and chops it up into a playlist
  • mediastreamsegmenter

See Also