1## 5.2\. Video Encoding 2 3If device implementations support any video encoder and make it available 4to third-party apps, they: 5 6* SHOULD NOT be, over two sliding windows, more than 15% over the bitrate 7between intraframe (I-frame) intervals. 8* SHOULD NOT be more than 100% over the bitrate over a sliding window 9of 1 second. 10 11If device implementations include an embedded screen display with the 12diagonal length of at least 2.5 inches or include a video output port or 13declare the support of a camera via the `android.hardware.camera.any` 14feature flag, they: 15 16* [C-1-1] MUST include the support of at least one of the VP8 or H.264 video 17encoders, and make it available for third-party applications. 18* SHOULD support both VP8 and H.264 video encoders, and make it available 19for third-party applications. 20 21If device implementations support any of the H.264, VP8, VP9 or HEVC video 22encoders and make it available to third-party applications, they: 23 24* [C-2-1] MUST support dynamically configurable bitrates. 25* SHOULD support variable frame rates, where video encoder SHOULD determine 26instantaneous frame duration based on the timestamps of input buffers, and 27allocate its bit bucket based on that frame duration. 28 29If device implementations support the MPEG-4 SP video encoder and make it 30available to third-party apps, they: 31 32* SHOULD support dynamically configurable bitrates for the supported encoder. 33 34If device implementations provide hardware accelerated video or image encoders, 35and support one or more attached or pluggable hardware camera(s) exposed through 36the `android.camera` APIs: 37 38* [C-4-1] all hardware accelerated video and image encoders MUST support 39encoding frames from the hardware camera(s). 40* SHOULD support encoding frames from the hardware camera(s) through all video 41or image encoders. 42 43### 5.2.1\. H.263 44 45If device implementations support H.263 encoders and make it available 46to third-party apps, they: 47 48* [C-1-1] MUST support Baseline Profile Level 45. 49* SHOULD support dynamically configurable bitrates for the supported encoder. 50 51 52### 5.2.2\. H.264 53 54If device implementations support H.264 codec, they: 55 56* [C-1-1] MUST support Baseline Profile Level 3. 57 However, support for ASO (Arbitrary Slice Ordering), FMO (Flexible 58 Macroblock Ordering) and RS (Redundant Slices) is OPTIONAL. Moreover, to 59 maintain compatibility with other Android devices, it is RECOMMENDED that 60 ASO, FMO and RS are not used for Baseline Profile by encoders. 61* [C-1-2] MUST support the SD (Standard Definition) video encoding profiles 62in the following table. 63* SHOULD support Main Profile Level 4. 64* SHOULD support the HD (High Definition) video encoding profiles as 65indicated in the following table. 66 67If device implementations report support of H.264 encoding for 720p or 1080p 68resolution videos through the media APIs, they: 69 70* [C-2-1] MUST support the encoding profiles in the following table. 71 72 73<table> 74 <tr> 75 <th></th> 76 <th>SD (Low quality)</th> 77 <th>SD (High quality)</th> 78 <th>HD 720p</th> 79 <th>HD 1080p</th> 80 </tr> 81 <tr> 82 <th>Video resolution</th> 83 <td>320 x 240 px</td> 84 <td>720 x 480 px</td> 85 <td>1280 x 720 px</td> 86 <td>1920 x 1080 px</td> 87 </tr> 88 <tr> 89 <th>Video frame rate</th> 90 <td>20 fps</td> 91 <td>30 fps</td> 92 <td>30 fps</td> 93 <td>30 fps</td> 94 </tr> 95 <tr> 96 <th>Video bitrate</th> 97 <td>384 Kbps</td> 98 <td>2 Mbps</td> 99 <td>4 Mbps</td> 100 <td>10 Mbps</td> 101 </tr> 102</table> 103 104### 5.2.3\. VP8 105 106If device implementations support VP8 codec, they: 107 108* [C-1-1] MUST support the SD video encoding profiles. 109* SHOULD support the following HD (High Definition) video encoding profiles. 110* [C-1-2] MUST support writing Matroska WebM files. 111* SHOULD provide a hardware VP8 codec that meets the 112[WebM project RTC hardware coding requirements]( 113http://www.webmproject.org/hardware/rtc-coding-requirements), to ensure 114acceptable quality of web video streaming and video-conference services. 115 116If device implementations report support of VP8 encoding for 720p or 1080p 117resolution videos through the media APIs, they: 118 119* [C-2-1] MUST support the encoding profiles in the following table. 120 121<table> 122 <tr> 123 <th></th> 124 <th>SD (Low quality)</th> 125 <th>SD (High quality)</th> 126 <th>HD 720p</th> 127 <th>HD 1080p</th> 128 </tr> 129 <tr> 130 <th>Video resolution</th> 131 <td>320 x 180 px</td> 132 <td>640 x 360 px</td> 133 <td>1280 x 720 px</td> 134 <td>1920 x 1080 px</td> 135 </tr> 136 <tr> 137 <th>Video frame rate</th> 138 <td>30 fps</td> 139 <td>30 fps</td> 140 <td>30 fps</td> 141 <td>30 fps</td> 142 </tr> 143 <tr> 144 <th>Video bitrate</th> 145 <td>800 Kbps </td> 146 <td>2 Mbps</td> 147 <td>4 Mbps</td> 148 <td>10 Mbps</td> 149 </tr> 150</table> 151 152### 5.2.4\. VP9 153 154If device implementations support VP9 codec, they: 155 156* [C-1-2] MUST support Profile 0 Level 3. 157* [C-1-1] MUST support writing Matroska WebM files. 158* [C-1-3] MUST generate [CodecPrivate]( 159https://www.webmproject.org/docs/container/#vp9-codec-feature-metadata-codecprivate 160) data. 161* SHOULD support the HD decoding profiles as indicated in the following table. 162* [SR] are STRONGLY RECOMMENDED to support the HD decoding profiles as 163indicated in the following table if there is a hardware encoder. 164 165<table> 166 <tr> 167 <th></th> 168 <th>SD</th> 169 <th>HD 720p</th> 170 <th>HD 1080p</th> 171 <th>UHD</th> 172 </tr> 173 <tr> 174 <th>Video resolution</th> 175 <td>720 x 480 px</td> 176 <td>1280 x 720 px</td> 177 <td>1920 x 1080 px</td> 178 <td>3840 x 2160 px</td> 179 </tr> 180 <tr> 181 <th>Video frame rate</th> 182 <td>30 fps</td> 183 <td>30 fps</td> 184 <td>30 fps</td> 185 <td>30 fps</td> 186 </tr> 187 <tr> 188 <th>Video bitrate</th> 189 <td>1.6 Mbps</td> 190 <td>4 Mbps</td> 191 <td>5 Mbps</td> 192 <td>20 Mbps</td> 193 </tr> 194</table> 195 196 197If device implementations claim to support Profile 2 or Profile 3 through the 198Media APIs: 199 200* Support for 12-bit format is OPTIONAL. 201 202### 5.2.5\. H.265 203 204If device implementations support H.265 codec, they: 205 206* [C-1-1] MUST support Main Profile Level 3. 207* SHOULD support the HD encoding profiles as indicated in the following table. 208* [SR] are STRONGLY RECOMMENDED to support the HD encoding profiles as 209indicated in the following table if there is a hardware encoder. 210 211<table> 212 <tr> 213 <th></th> 214 <th>SD</th> 215 <th>HD 720p</th> 216 <th>HD 1080p</th> 217 <th>UHD</th> 218 </tr> 219 <tr> 220 <th>Video resolution</th> 221 <td>720 x 480 px</td> 222 <td>1280 x 720 px</td> 223 <td>1920 x 1080 px</td> 224 <td>3840 x 2160 px</td> 225 </tr> 226 <tr> 227 <th>Video frame rate</th> 228 <td>30 fps</td> 229 <td>30 fps</td> 230 <td>30 fps</td> 231 <td>30 fps</td> 232 </tr> 233 <tr> 234 <th>Video bitrate</th> 235 <td>1.6 Mbps</td> 236 <td>4 Mbps</td> 237 <td>5 Mbps</td> 238 <td>20 Mbps</td> 239 </tr> 240</table> 241