Video Editing - HD
Because of not being totally intraframe, using MPEG-2 GOP (group of pictures) structure instead, the direct, native editing HDV footage is technically different from the native editing of DV footage. In DV, as each frame of a video sequence is stored as an independent object, the recorded footage can be spliced at any frame without any loss of quality.
When editing HDV's MPEG-2 directly (natively), a single frame cannot be changed without re-encoding subseqent frames of the same group. Any editing of the native MPEG-2 video, whether it be a complex transition or a simple scene-change, requires a decompression and recompression cycle of the entire HDV frame group. Especially over many generations, this may result in increased artifacts, for example the next frame group after a splice. However, because the bitrate is 25 MB/s, they should be not as visible as they would be when using lower bitrates like those used for encoding clips for download.
If HDV footage is converted to a good intermediary format for editing, these considerations which only apply to natively editing HDV's MPEG-2, do not apply. As with DV footage, a good intermediary format and a good codec given, there does not have to be any degradation in quality, not even over 10 generations of decoding and re-encoding. (more)
posted by Azure Production @ 5:43 PM
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