The transcoder with a human touch.
The Rithm Advantage
Rithm uses content-adaptive encoding (CAE), to automatically sense how “difficult” each video is to encode and adapts the encoding accordingly to ensure high quality for complex videos and maximum bandwidth savings for simple videos. Rithm combines two patented technologies: Signal-Adaptive Bit Rate Estimation (SABRE) and Perceptual Quality Optimization (PQO).
SABRE is segment-based. The technology looks at all the frames in a video segment and uses a model to determine the necessary bitrate to achieve the desired mean opinion score, or quality level, in that segment. SABRE models are based on scores recorded by human subjects, not mathematical equations.
PQO is frame-based, assigning more bits to the most perceptually important areas of the frame. The PQO approach is based on the human visual system and makes encoding decisions that best reflect human perception.
PQO and SABRE are complementary technologies. Though SABRE and PQO work independently, SABRE’s determinations consider PQO’s bitrate reductions when setting the overall bitrate for each video segment and achieves large bitrate savings of 15% to 75% for ABR streaming of a wide variety of HD content. Rithm is designed to lower the output bitrate of each video encoding as much as possible to maximize bandwidth savings, but never so much that the video quality is below what the operator desires.
Rithm in Action
The videos shown here are 1080p fully compliant H.264 bitstreams encoded with Rithm. Prior to encoding, a maximum allowable encoding bitrate or “standard” bitrate is specified, and a quality level is chosen to balance bitrate savings and encoding quality. Rithm determines the lowest bitrate that maintains the chosen quality level and results in both significant bandwidth savings and high-quality encoding for all of these videos!