Encoding transform
An encoding transform is the recipe on how to process the input asset into a set of MP4 files with the given resolution and bitrates.
Built-in presets
MK.IO provides a set of built-in presets to be used in such encoding transform.
The following built-in presets are supported:
Built-in preset name | Video | Audio |
|---|---|---|
AACGoodQualityAudio (Foundations) | n/a | 192 kbps |
H264SingleBitrateSD (Foundations) | 848x480 @ 30fps / 2200kbps | 128 kbps |
H264MultipleBitrateSD (Foundations) H264MultipleBitrateSDWithCVQ (Advanced) | 432x240 @ 30fps / 400kbps 640x360 @ 30fps / 650kbps 848x480 @ 30fps / 900kbps 848x480 @ 30fps / 1300kbps 848x480 @ 30fps / 1900kbps | 128 kbps |
H264SingleBitrate720p (Foundations) | 1280x720 @ 30fps / 4500kbps | 128 kbps |
H264MultipleBitrate720p (Foundations) H264MultipleBitrate720pWithCVQ (Advanced) | 320x180 @ 30fps / 400kbps 640x360 @ 30fps / 600kbps 640x360 @ 30fps / 1000kbps 960x540 @ 30fps / 1500kbps 960x540 @ 30fps / 2250kbps 1280x720 @ 30fps / 3400kbps | 128 kbps |
H264SingleBitrate1080p (Foundations) | 1920x1080 @ 30fps / 6750kbps | 128 kbps |
H264MultipleBitrate1080p (Foundations) H264MultipleBitrate1080pWithCVQ (Advanced) | 320x180 @ 30fps / 400kbps 640x360 @ 30fps / 600kbps 640x360 @ 30fps / 1000kbps 960x540 @ 30fps / 1500kbps 960x540 @ 30fps / 2250kbps 1280x720 @ 30fps / 3400kbps 1920x1080 @ 30fps / 4700kbps 1920x1080 @ 30fps / 6000kbps | 128 kbps |
H265SingleBitrate720p (Advanced) | 1280x720 @ 30fps / 1800kbps | 128 kbps |
H265SingleBitrate1080p (Advanced) | 1920x1080 @ 30fps / 3500kbps | 128 kbps |
H265SingleBitrate4K (Advanced) | 3840x2160 @ 30fps / 9500kbps | 128 kbps |
Audio streams are encoded in stereo with HE-AAC audio codec.
If a different encoding ladder is required, please contact our support channels for help.
Input file formats
| File formats (file extensions) | Supported |
|---|---|
| MP4 (.mp4, .m4a, .m4v) | Yes |
| MPEG2-PS, MPEG2-TS (.ts, .ps, .mpg) | Yes |
| Matroska MKV (.mkv) | Yes |
| QuickTime (.mov) | Yes |
| MXF (.mxf) | Yes |
| Flash Video FLV (.flv) | Yes |
| 3GP (.3gp, .3gpp) | Yes |
| Matroska WebM (.webm) | Yes |
| ISMV (.ismv, .isma) | Yes |
| AVI (Uncompressed 8bit/10bit) (.avi) | Yes |
| Windows Media Format (WMV) (.wmv) | Yes |
Output file format
MK.IO uses an MP4 file format for the VOD assets. Each asset generated through VOD transcoding will contain the following files:
- MP4 files (.mp4), one per video rendition with all audio streams interleaved
- Server manifest (.ism) used as the access point for streaming endpoints
- Client manifest (.mpd)
- Index files (.mpi), one per rendition (used to enhance performance of the streaming delivery)
The naming of the files on output of VOD transcoding uses the input filename as a prefix for all files in the asset.
Input video codecs
File formats (file extensions) | Supported |
|---|---|
H264/AVC, including AVCIntra | Main and High Profiles, 8-bit/10-bit Up to 4:2:2 |
HEVC/H.265 | Main Profile, 8-bit/10-bit Up to 4:2:2 |
MPEG-2 | Man and High Profiles Up to 4:2:2 |
Sony XAVC / XAVC S | Yes |
DVCPro SD and HD | Yes |
Digital video DV and HDV | Yes |
JPEG 2000 | Yes |
Apple ProRes 422, including LT and HQ | Yes |
Apple ProRes 4444, including XQ | Yes |
Sony XAVC | Yes |
Sony XDCAM IMX | Yes |
Sony XDCAM, including HD and EX | Yes |
Dolby Vision 5 and 8.1 | Yes |
V210 Video Picture Encoding | Yes |
MPEG-1 | Yes |
VC-1 | Yes |
VP8 | Yes |
VP9 | Yes |
MJPEG | Yes |
AV1 | Yes |
Microsoft MPEG4v1, v2 and v3 | Yes |
H263 | Yes |
Avid DNxHD and DNxHR | Yes |
Sorenson Spark | Yes |
Input audio codecs
| File formats (file extensions) | Supported |
|---|---|
| AAC, including AAC-LC, AAC-HE, and AAC-HEv2; up to 5.1) | Up to 5.1 |
| MPEG Layer 2 | Yes |
| MP3 (MPEG-1 Audio Layer 3) | Yes |
| PCM, LPCM, DPCM and ADPCM | Yes |
| AES (SMPTE 331M and 302M, AES3-2003) | Yes |
| Dolby E | Passthrough only |
| Dolby Digital (AC3) | Yes |
| Dolby Digital Plus (E-AC3) | Yes, including Dolby Atmos in passthrough |
| DTS | Yes |
| Opus | Yes |
| Vorbis | Yes |
| Apple Lossless Audio Code (ALAC) | Yes |
Updated 12 days ago