Achurch

achurch == Andrew Church. I use transcode primarily for converting home video (DV) and material recorded off-the-air to DVD or other convenient formats. I've contributed various minor patches to transcode, as well as the MMX version of the optimized memcpy routine in aclib/memcpy.s.

Pages I've written on the transcode wiki:

• AC3 vs. MP2
• DVtoDVD
• dvtodvd.sh
• FFmpeg vs. mpeg2enc
• interlacing
• multiplexing

I also have a home page at http://achurch.org/index-e.html (completely unrelated to transcode).

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Visual comparison (under construction for FFmpeg vs. mpeg2enc)

The following tables show a comparison of FFmpeg and mpeg2enc encoding of a high-motion scene (the source is interlaced TV).

Full images:

Codec	3000 kbps	9000 kbps
Original image	[704x480 PNG]
FFmpeg (1-pass)	[704x480 PNG]	[704x480 PNG]
FFmpeg (2-pass)	[704x480 PNG]	[704x480 PNG]
mpeg2enc	[704x480 PNG]	[704x480 PNG]

Note the distortion in the faces below. FFmpeg's 2-pass processing gives it a clear advantage at 3000 kbps, but even at 9000 kbps the lower half of the left face comes out slightly better with 2-pass FFmpeg.

Codec	3000 kbps	9000 kbps
Original image
FFmpeg (1-pass)
FFmpeg (2-pass)
mpeg2enc

Significant "blocking" can be seen here at 3000 kbps--note the "slips" every 16 scanlines or so. Again, 2-pass FFmpeg proves superior at 3000 kbps, but all three codecs perform just fine at 9000 kbps.

Codec	3000 kbps	9000 kbps
Original image
FFmpeg (1-pass)
FFmpeg (2-pass)
mpeg2enc