HDLink – File Conversion Techniques

CineForm's HDLink contains flexible file conversion capabilities, including the following:

•  Batch conversion of many different file formats into CineForm Intermediate. Supported input file formats include: most AVI files, many MOV files, P2 (mxf) files, .m2t, .ts, XDCam HD (.m2t) and WMV.  Source files can be SD (including DV) or HD.  (The rule of thumb is that if your file will play in Windows Media Player, then HDLink can convert it into CineForm Intermediate.)

•  Selection of AVI or QuickTime (MOV) wrappers for CineForm files.

•  Spatial rescaling from various SD or HD resolutions to HD: 1280x720p, 1440x1080i/p, 1920x1080i/p (Prospect HD), or SD: 480i/p, 486i/p, 576i/p

•  Deinterlacing: for instance 1080i60 à 1080p30 or 480i60 à 480p30

•  Frame rate conversion including audio remodulation: for instance 1080p25 à 1080p24.

•  Letterboxing or pillarboxing (optional) during spatial rescaling of material with different aspect ratios

Resizing footage with varying source characteristics: File conversion features in HDLink allow great flexibility for combining footage from various sources, regardless of the source codec, spatial resolution, SD or HD, interlaced versus progressive, or frame rate.

If no Frame Rate, Pre-compression Filters, or Resize Video options are selected, then each source file will be converted into an equivalent CineForm Intermediate file while retaining its spatial and temporal characteristics.

Changing Spatial Resolution: When changing spatial resolution, simply choose the file(s) you want to convert, even if source files have varying spatial resolutions, and choose your output resolution.  The resulting files will maintain their existing temporal characteristics (if no deinterlace or frame rate options are selected), and all files will be converted to the selected spatial resolution.  In the example below all source files will be converted to a spatial resolution of 1440x1080.

Prefs panel from CineForm's HDlink application. 

 

Temporal Changes: You can combine multiple conversions in one step.  For instance, if you shoot 1080i60, (or the 24-frame modes from certain HD cameras that add pulldown) and want 1080p24 as the final format, you can select a) Remove 3:2 pulldown, and also b) De-interlace 1080i and DV sources (as shown) which will convert 60i to 24p.

60i to 24p conversion settings.

NOTES:

•  Codec Sources: Source files need not have the same codec source.  You can convert DV files, M2T files, WMV files, etc, in the same batch conversion process.

•  Spatial Conversion: When batch-converting multiple files, source files need not have the same spatial resolution.  Each file will be converted separately to the chosen output resolution.

•  Temporal Conversion: When batch-converting multiple files with deinterlacing or frame-rate conversion, all source files should have the same temporal characteristics.  In other words, don't select progressive files and interlaced files together and select the "deinterlace" option.

•  SD Source à HD: If you select "Keep source aspect ratio", then 4:3 SD footage will be pillar-boxed into a 16x9 CineForm AVI. With this box unchecked, converted footage will be stretched horizontally to fill the frame.

•  Footage wider than 16:9? With “Keep source aspect ratio” checked, wider aspect ratio material will be letterboxed into a 16:9 CineForm Intermediate file.

Unsupported formats?: Note that some third-party decoders may be required to convert certain types of files.  If a format is not supported, the HDLink log will notify you with the message “Format not supported.” Either install the codec for that file type, or delete the file from your “Source Clips” bin.

•  Conversion Time: Speed of file conversion is a function of CPU speed, source file size, and the filters that are applied.  On today's fast CPUs many conversions will happen much faster than real time.

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