5.2. Video Encoding
H.264, VP8, VP9 and HEVC video encoders—
- MUST support dynamically configurable bitrates.
- SHOULD support variable frame rates, where video encoder SHOULD determine instantaneous frame duration based on the timestamps of input buffers, and allocate its bit bucket based on that frame duration.
H.263 and MPEG-4 video encoder SHOULD support dynamically configurable bitrates.
All video encoders SHOULD meet the following bitrate targets over two sliding windows:
- It SHOULD be not more than ~15% over the bitrate between intraframe (I-frame) intervals.
- It SHOULD be not more than ~100% over the bitrate over a sliding window of 1 second.
Android device implementations with H.263 encoders MUST support Baseline Profile Level 45.
Android device implementations with H.264 codec support&emdash;
- MUST support Baseline Profile Level 3.
However, support for ASO (Arbitrary Slice Ordering), FMO (Flexible Macroblock Ordering) and RS (Redundant Slices) is OPTIONAL. Moreover, to maintain compatibility with other Android devices, it is RECOMMENDED that ASO, FMO and RS are not used for Baseline Profile by encoders.
- MUST support the SD (Standard Definition) video encoding profiles in the following table.
- SHOULD support Main Profile Level 4.
- SHOULD support the HD (High Definition) video encoding profiles as indicated in the following table.
- In addition, Android Television devices are STRONGLY RECOMMENDED to encode HD 1080p video at 30 fps.
Android device implementations with VP8 codec support MUST support the SD video encoding profiles and SHOULD support the following HD (High Definition) video encoding profiles.