[Tig] D5 Compression
markq at primepost.com
Fri Apr 4 18:12:22 BST 2008
The channel condition was fine. Could this just be an artifact of the
DCT compression that D5's use?
On Apr 3, 2008, at 4:44 PM, DCFWTX at aol.com wrote:
> In a message dated 4/3/2008 1:50:39 PM Pacific Standard Time,
> markq at primepost.com writes:
>> Recently I noticed some rather nasty looking compression artifacts on
>> D5 tape. The compression appeared as large digital blocks in the
>> darkest parts of the image. One shot that looked particularly bad was
>> of a star field. Around some of the more faint stars blocking was
>> apparent. I had to turn the brightness up a bit on the monitor to
>> it but it was definitely there. The source was an HDCAMSR 4:4:4
>> looked clean. I know the compression rate is lower in HDCAMSR but I
>> was surprised at how bad the D5 looked. Has anyone else noticed
> How did the channel conditions look at the time of the blocking? It
> is not unusual to occur in D5, and could be recorded in that way
> without a channel condition error indication (at least that has been
> my experience).
> David Crosthwait
> DC Video
> Archive Videotape Re-mastering
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> DAVID at DCVIDEO.COM
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