FFmpeg GUI ideas
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- Query API
  - Written into the libraries
  - Allow querying of protocol, demuxer, parser, decoder, encoder, muxer
    capabilities
  - Allow querying of options, and corresponding restrictions, relevant to a
    codec/muxer/etc.
  - Pixel/sample formats
  - Stream/frame/macroblock/pixel levels
- Stream analysis
  - Report general stream information (like `ffmpeg -i infile`)
  - Report bit stream features (SBR, GMC, QPel, packed, transforms used, wpred,
    CAVLC/CABAC, quantisation matrices, etc etc)
  - MPEG codecs report profile/level
  - VBV analysis/verification
  - Frame analysis (frame type, QPs, MVs, partitions, graph of frame sizes/psnr/
    ssim/diff)
- File conversion
  - Presets for speed/quality and profiles (MPEG codecs, hardware devices, etc.)
    - Query FFmpeg for official presets/profiles
    - User-defined presets/profiles
  - Multiple file input interface
    - Input file grouping
      - Select multiple files in input list from which a group can be created
      - Select streams from files within group to be used in output (ordering?)
    - Batch grouping
      - Select multiple input files/groups to be encoded using the same codec
        options (not necessarily same filtering - toggle?)
    - Batch conversion queue
      - Pause/resume
      - List of queued jobs
        - Job information (display requested settings, input files, etc)
        - Editing of jobs (locks the job so it cannot commence while editing in
          progress?)
  - Flexible assignment of codec properties using query APIs for self-
    maintenance or use CLI and allow pasting of CLI option strings
  - Filtering using libavfilter
    - Graph editing
    - Preview with timeline scrubber
    - Load/save graphs

- Tarantula (fundamental bitstream testing tool)
  - Scriptable demuxing
  - Audio
    - Changeable sample rate/sample format
    - Visualisation
  - Video
    - Changeable frame rate/dimensions/pixel format