# Supported
* y4m pipes
* Frame tested support for 4:4:4, 4:2:2, 4:2:0. Probably 4:0:0 as well, untested.
* Frame tested support for 8, 10, 12 bit depth. Probably 14 and 16 as well, untested.
* VMAF tools
* IVF reader
* Frameserver
* TODO: make list per encoder and decoder.

## Bitdepth / subsampling Frame support matrix

| Depth/Sampling | 4:0:0 | 4:2:0 | 4:2:2 | 4:4:4 |
|:--------------:|:-----:|:-----:|:-----:|:-----:|
|     8-bit      |   ✅   |   ✅   |   ✅   |   ✅   |
|     10-bit     |   ✅   |   ✅   |  ⚠️   |  ⚠️   |
|     12-bit     |  ⚠️   |  ⚠️   |  ⚠️   |   ✅   |
|     14-bit     |   ❔   |   ❔   |   ❔   |   ❔   |
|     16-bit     |   ❔   |   ❔   |   ❔   |   ❔   |

Legend: 

✅ = supported, tested regularly

⚠️ = supported, tested sparsely/manually

❔ = probably supported, not tested

❌ = unsupported

## Formats supported

|    Format     | Decoder | Encoder | Notes                                                                                                                                                                                                                                                             |
|:-------------:|:-------:|:-------:|:------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| **YUV4MPEG2** |    ✅    |    ❌    | Supports most bitdepth and chroma subsampling. Library limited, not format limited.</br>Decoding via [S.O.N.G/Ignite](https://git.gammaspectra.live/S.O.N.G/Ignite)                                                                                               |
|   **H.264**   |    ❌    |    ✅    | Supports 8-bit and 10-bit; 4:0:0, 4:2:0, 4:2:2, 4:4:4 chroma subsampling.</br>Encoding via [x264](https://code.videolan.org/videolan/x264) into .h264 bitstream.                                                                                                  |
|   **H.265**   |    ❌    |    ❌    |                                                                                                                                                                                                                                                                   |
|    **VP9**    |    ❌    |    ❌    |                                                                                                                                                                                                                                                                   |
|    **AV1**    |    ✅    |    ✅    | Supports 8-bit, 10-bit and 12-bit; 4:0:0, 4:2:0, 4:2:2, 4:4:4 chroma subsampling.</br>Decoding via [dav1d](https://code.videolan.org/videolan/dav1d) from .ivf bitstream</br>Encoding via [libaom-av1](https://aomedia.googlesource.com/aom) into .ivf bitstream. |

Additionally, a safe command-line call to ffmpeg can be made to decode into compatible YUV4MPEG2 via the integrated ffmpeg decoder.

# TODO
* No SAR/PAR handling.
* No color primary / transfer / matrix coefficients handling.


## Build tags
Several Golang build tags exist to change which features are included in the project.

### disable_library_[library]
This tag disables support for the specified library dependencies.

Current implemented [library]: `libdav1d, libaom, libx264, libvmaf`.