v0.31.0

• API:
  • Add color space and dolby vision profile in MediaInfo
  • Add VideoEffect::ScaleChannels and ShiftChannels
  • Add Player.subtitleText() to get subtitle text(except bitmap subtitles) with ass style or not, even if subtitle rendering is disabled by setProperty("subtitle", "0"). see https://github.com/wang-bin/mdk-sdk/wiki/Player-APIs#stdstring-subtitletextdouble-time---1-int-style--0-const
• EGL:
  • Support HDR color spaces. player.set(ColorSpaceUnknown) will switch between HDR and SDR color space depending on current rendering video frame. Tested on android, may work on linux
  • Enable HDR10 metadata pass through, can be disabled by env var EGL_HDR_METADATA=0
  • Prefer rgb10a2 to avoid recreating context when switching between SDR and HDR
  • Support KHR_no_config_context to avoid recreating context when switching between SDR and HDR
• Subtitle:
  • Fix properties not applied if set before play
  • Support splitting ASS rendered rgba image into several smaller regions when possible to reduce total size and gpu bandwidth. controlled by player property subtitle.ass.regions.max or env ASS_REGIONS_MAX, value is int. use subtitle.ass.regions.debug or env ASS_REGIONS_DEBUG to visualize regions and show debug messages.
  • Keep colorspace the same as video, fix dark in bt2020 pq
  • Add player property subtitle.scale to scale all kind of subtitles. default is 1.0, i.e. no scale
  • Fix subtitle.blur is not applied because of a libass bug
  • Add player property subtitle.size, default value is video to render in video frame size, other values will render in video renderer resolution
  • Redraw subtitle if output resolution changed even if playback is paused, e.g. rendering in renderer resolution, and resize the renderer
  • Redraw subtitle for any subtitle property change even if playback is paused.
  • Render earlier
  • Fix dead lock
  • Fix unexpected null texture for some timestamp values and blinking
  • Set ass storage size
• Dolby vision: Fix shader error if yuv sampler is used for MediaCodec decoder
• GL: add glFinish() before context destroyed
• D3D11: Improve UMA support check. UMA optimized texture download. can be disabled by env GPU_OPTIMAL_DOWNLOAD=0
• DXGI: Use the 1st screen's HDR capability
• Metal: Fix rendering mutiple overlayes
• MFT: return error if output type is not supported
• Fix wrong start time if record() multiple times.
• Fix buffered packets out of range of the value set by setBufferRange()
• Fix audio not decoded after seek if paused and result in a/v desync(apple only).
• Fix seek(if not started) callback may be called twice.
• Fix global subtitle options not applied, regression in 0.30.1
• FFmpeg:
  • Support webvtt in mkv. Patch is from avbuild, not merged by upstream.
  • Workaround aac packets from rtsp have no keyframe if ffmpeg > 7.1