# Video Profiles

A **`video_profile`** defines a set of video and audio attributes for the output. Following attributes are given:

> **Video Resolution:** output frame size - only the height of frame is used (1080p, 720p..etc); width of frame is based on the input display aspect ratio.

> **Video Codec**: video codec to compress and produce the output - currently H264 is supported. Additional codecs like H265, VP9, and AV1 are coming soon.

> **Video Bitrate:** number of kilobits per second (kbps) used to compress and produce video output. Higher the bitrate delivers better quality. However, higher bitrate produces higher data output: harming the playback experience, increasing the storage, delivery, and costs.

> **Video Framerate:** number of frames per second.

> **Audio Codec:** audio codec used to compress and produce audio output. Default codec is AAC.

> **Audio Channel:** number of audio channels. Default number of channels is 2

> **Audio Bitrate:** number of kilobits per second (kbps) used to compress and produce audio output. Default audio bitrate is 128 kbps.

> **Segment Duration:** The duration of HLS / DASH segments in seconds. Higher value increases latency/buffer time, but stabilizes playback experience.

> **Orientation:** video frame orientation. With the increase of portrait(vertical) videos , this attribute helps Uiza optimize the output.