[Tig] D5 Compression

Mark Quod 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?

Mark


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  
>> a
>>  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  
>> see
>>  it but it was definitely there.  The source was an HDCAMSR 4:4:4  
>> which
>>  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  
>> this?
>>
>>  Mark
>
>
>  Mark,
>
>  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
>  177 West Magnolia Blvd.
>  Burbank, CA. 91502
>  818-563-1073
>  818-563-1177 (fax)
>  818-285-9942 (cell)
>  DCFWTX at AOL.COM    
>  DAVID at DCVIDEO.COM
> WWW.DCVIDEO.COM
>
>
>
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