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HM790 60p vs 30p Long-GOP quality

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Paul Anderegg
HM790 60p vs 30p Long-GOP quality
on Jun 13, 2013 at 11:03:03 pm

I am trying to improve quality in low bit-rate ftp files for broadcast.

The camera in question is an HM790, that normally shoots in 1280x720 60p HDV (mov) 19Mbps MPEG2 format. When ftp'ing breaking stories, it is often necessary to use very low bit-rate h264 format to get files in house fast enough for the top of the show. As I am new to the JVC HDV system, I am trying to figure out if I can adjust the frame rate to gain a quality boost.

The original footage is 60p, and the video airs at 60p. Not being too familiar with long-GOP MPEG2, would sending in 30p files in the 2-4Mbps range noticeably increase the quality of the video? I know I won't see a DOUBLING of quality because not every pixel is duplicated in those extra frames, but I feel that at the low bit-rates involved, every bit may count.

Also, in a slightly related question......when shooting at 1/30th sec shutter speeds and 60p, am I basically creating 30p video in a 60p "wrapper"?

Any help greatly appreciated! :)


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