There has been some posts on the "apparent" ?? interlacing/progressive formats of files produced using AVCHD. MBAFF scan type is a integral feature of h.264.

"MBAFF, or Macroblock-Adaptive Frame/Field Coding, is a video encoding feature of MPEG-4 AVC that allows a single frame to be encoded partly progressive and partly interlaced. Maintaining the quality of interlaced video can be a challenge in video encoding because of the larger spaces between horizontal lines in the same field. MBAFF allows an AVC encoder to examine each block in a frame to look for similarities between interlaced fields. When there is no motion the fields will tend to be very similar, resulting in better quality if you encode the block as progressive video. For blocks where there is motion from one field to another the quality is more likely to suffer if encoded progressive, so these blocks can remain interlaced. "

Running XPMCE SP3 with a Radeon 4650 card using ATI Stream, and producing the same .mp4 file from a Sanyo HD1010 720p 29.97fps progressive gives the mediainfo results below.

The production profiles were either the standard PD8 ones for 1440 and 1920 or a custom 720 from the custom menu options - no other changes were made.

The files are named [resolution]HA or NHA for hardware acc. or no hardware acc. The screenshots have each pair of results [resolution]HA or [resolution]NHA

I believe Dafydd, using Nvidia/CUDA gets different results. Make of it what you will.

Cheers
Adrian
Life is really simple, but we insist on making it complicated. (see below)
Confucius
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