Codec Settings

These following codec settings are the optimal settings for streaming destinations within Scrypted. Streaming destinations include:

• HomeKit
• Google Home
• Alexa
• Chromecast
• Web

Stream Setup

Most cameras will have one 1 main stream and 1 substream. Some may only have 1 main stream. Cameras with 1 main stream and 2 sub streams are ideal. Some cameras, such as Hikvision or Amcrest, allow more streams and higher fps when AI is disabled. The camera AI is not used within Scrypted, and can be disabled for better performance.

Choose the appropriate section below based on the camera's available streams:

1 Main Stream

• Main Stream
  • 1920x1080, 2 Mbit variable bitrate (remote streaming may suffer due to lack of sub streams)

1 Main Stream, 1 Sub Stream

• Main Stream (Max Available Resolution):
  • 3840x2160, 8 Mbit variable bitrate
  • 2688x1520, 3.5 Mbit variable bitrate
  • 1920x1080, 2 Mbit variable bitrate
• Sub Stream:
  • 1280x720 (or lower), 1 Mbit, variable bitrate

1 Main Stream, 2 Sub Streams

• Main Stream (Max Available Resolution):
  • 3840x2160, 8 Mbit variable bitrate
  • 2688x1520, 3.5 Mbit variable bitrate
  • 1920x1080, 2 Mbit variable bitrate
• Sub Stream 1 or 2:
  • 1280x720, 1 Mbit, variable bitrate
• Sub Stream 1 or 2:
  • 640x360, 500 Kbit variable bitrate

Configure Stream Codecs

• These settings apply for all the above streams.
• h264 video. Do NOT use H.264+, "Super" H.264, H.264B, or any other fancy variant. TURN IT OFF. Sometimes this unsupported variant setting is called "Smart Code(c)" and it should be set to "Close" or "Off".
• Any FPS between 10 and 30 is fine, and available FPS may depend on the camera and will determine the Frame Interval.
• 4 second keyframe interval
  • Keyframe Interval is the number of seconds between keyframes. Frame Interval is the number frames between keyframes.
  • Cameras are typically configured in Frame Interval rather than Keyframe Interval. The formula for Frame Interval value is: Frame Interval = 4 * FPS. Examples:
    • If FPS is 30, Frame Interval should be set to 120.
    • If FPS is 20, Frame Interval should be set to 80.
    • If FPS is 10, Frame Interval should be set to 40.
• Configure the audio codec on all streams by manufacturer recommendation below, and codec availability.

  Manufacturer	Codec	Sample Rate
  Amcrest/Dahua	AAC	8000
  Other Manufacturer	PCM-ulaw/G711u/G711mulaw	8000