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| UK Digital Video (uk.rec.video.digital) For the discussion of all aspects of digital video, including all digital video formats, camera use, editing, post production & all associated equipment, hardware and software. Advertising is prohibited. |
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#1
July 13th 03, 04:40 PM
posted to uk.rec.video.digital
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 Is DV or MiniDV format lossy? Is the DV or MiniDV compression format lossy in any way whatsoever or is it non lossy like for example the zip format? Tia   |
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#2
July 13th 03, 05:41 PM
posted to uk.rec.video.digital
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| Is DV or MiniDV format lossy? "kash" yahoo.com wrote in message ... Is the DV or MiniDV compression format lossy in any way whatsoever or is it non lossy like for example the zip format? It's both lossy and non-lossy. Video is compressed in a lossy way, with a compression of 1:9.1 Audio is uncompressed (i.e. non-lossy) PCM. Overall, the file will have a compression ratio of about 1:8.6 To be honest, the compression barely makes a noticeable difference to the video. I don't know the ins and outs of exactly _how_ the video is compressed, but it doesn't seem to make it look too ropey! -- Ed Fielden, Cirencester, UK |
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#3
July 14th 03, 12:04 AM
posted to uk.rec.video.digital
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| Is DV or MiniDV format lossy? "Ed Fielden" wrote in message ... "kash" yahoo.com wrote in message ... Is the DV or MiniDV compression format lossy in any way whatsoever or is it non lossy like for example the zip format? It's both lossy and non-lossy. Video is compressed in a lossy way, with a compression of 1:9.1 Audio is uncompressed (i.e. non-lossy) PCM. Overall, the file will have a compression ratio of about 1:8.6 Could you possibly explain this ratio compression business to me. I've never quite understood what its on about. -- E.' |
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#4
July 14th 03, 07:20 AM
posted to uk.rec.video.digital
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| Is DV or MiniDV format lossy? "E. Greenbank" wrote in message ... "Ed Fielden" wrote in message ... "kash" yahoo.com wrote in message ... Is the DV or MiniDV compression format lossy in any way whatsoever or is it non lossy like for example the zip format? It's both lossy and non-lossy. Video is compressed in a lossy way, with a compression of 1:9.1 Audio is uncompressed (i.e. non-lossy) PCM. Overall, the file will have a compression ratio of about 1:8.6 Could you possibly explain this ratio compression business to me. I've never quite understood what its on about. As it was explained to me by a Sony engineer when DV first came out, full frame uncompressed digital video is 270Mbit/sec. DV reduces the area of the frame slightly and reduces the colour sampling to 'half'. That alone brings the data rate down to around 125 Mb/s, those bits are dumped never to be seen again. The remainder is 5:1 compressed to the familiar 25Mbits/sec. So there is an element of hype in the 5:1 claim, it could be argued it's nearer to 10:1. But it works well. The audio is not compressed at all. -- Malcolm |
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