User Manual

HDV Workflow
1527
Your Avid editing application uses a technique called long-GOP splicing when encoding an
HDV MPEG-2 sequence for export. For more information, see “Long-GOP Splicing for HDV
Encoding” on page 1530.
HDV uses MPEG-2 video encoding and MPEG-1 audio encoding. 1080i records at about
25Mbps and 720p records at about 19Mbps. Sony provides HDV cameras that record at
1080i/59.94 and 1080i/50. JVC
®
cameras record at 720p/29.97 and 720p/23.976.
In some 1080i formats on qualified systems, you can reduce the data rate of the video before
compression by setting the video display (raster) to resize horizontally from 1920 x 1080 pixels
to 1440 x 1080 pixels or to 1280 x 1080 pixels. In contrast, 720p projects use the standard HDV
raster size of 1280 x 720. A special resolution, DNxHD-TR (for Thin Raster), improves the
performance of 1080 HDV editing. This resolution matches the 1080i HDV raster size, reducing
artifacts that would come from repeated compressions when rendering effects and graphics.
HDV Workflow
A basic workflow for an HDV project is as follows:
1. Select one of the following Avid project types depending on the format in which your HDV
camera records and the project types available for your input/output hardware:
- 720p/23.976
- 720p/25
- 720p/29.97
- 720p/50
- 720p/59.94
- 1080i/50
- 1080i/59.94
2. Click the Raster Dimension menu, and select the appropriate raster size.
3. Do one of the following:
-Capture HDV material.
- Import an HDV file.
The media is brought in as one video track and two 48-kHz audio tracks.
4. Edit the material.