2020/Austin/video

Video was a session at IndieWebCamp Austin 2020.

• Video: ▶️42:49s

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

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

Participants

• Add yourself here… (see this for more details)

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

• 2020/Austin/Schedule
• video