# Intel® Media SDK open source
**Whats new**
- Add MCTF support
- API 1.26
# Intel® Media SDK open source release v1.3!
**Whats new**
- Add SCD support
- API 1.25
- 1:N performance improvements
- Support open source [Intel® Media Driver for VAAPI](https://github.com/intel/media-driver)
- Multi-Frame encode APIs support added helping to improve transcoding dencity in multi-stream scenario, following known limitations apply to current implementation:
- Only H264 Encode is supported at a moment.
- Optimized only for Xeon E3 1500 v5 series.
- Performance can be worse than usual single-frame in next known cases:
- 4K resolution encoding.
- N:N with HEVC decode present in pipeline.
- cases where framerates differs significantly like 30 and 60 for different streams.
- Following functionality is not supported with multi-frame encode operation and when set, multiframe will be disabled:
- When number of slices is controlled by parameters *NumSlice*, *NumSliceI*, *NumSliceP*, *NumSliceB*.
- ‘intra refresh’ parameters are not supported.
- MFX_MF_AUTO implemented at a moment.
- FEI is not supported by open source driver for multiframe operation, proper SDK behavior is not validated.
- Supported MaxNumFrames is 3, Only 2 will be used for next cases: *EnableMBQP*, *EnableMAD*, *EnableMBForceIntra*, *MBDisableSkipMap*.
# Intel® Media SDK open source release v1.2!
**Whats new**
- Added User-defined Bitrate Control support
- Added C++ 11 support
**Known limitations**:
- Copy from video to system memory with `mfxInitParam::GPUCopy = MFX_GPUCOPY_OFF` leads to performance degradation up to x10 comparing to Intel® Media Server Studio release
- Intel® Media Server Studio [limitations](https://software.intel.com/en-us/articles/intel-media-server-studio-release-notes)
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# Intel® Media SDK open source release v1.1!
**Whats new**
- Aligned with Intel® Media Server Studio 2017 R3, featuring CentOS 7.3 support
- Intel® Media Server Studio [release notes](https://software.intel.com/en-us/articles/intel-media-server-studio-release-notes)
# Intel® Media SDK first open source release!
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