Quantcast Pro-Res conversion archival for Hi8 tapes? - digitalFAQ Forum
  #1  
06-09-2019, 11:52 AM
frekili frekili is offline
Free Member
 
Join Date: Jan 2012
Posts: 1
Thanked 0 Times in 0 Posts
Hi Lordsmurf, in your opinion Pro-res HQ digital copies of PAL Hi8 tapes played with a Sony EV-s9000 and converted to Pro-Res HQ files with a AJA io HD ,can be considered as archival copies? Thanks
Reply With Quote
Someday, 12:01 PM
admin's Avatar
Ads / Sponsors
 
Join Date: ∞
Posts: 42
Thanks: ∞
Thanked 42 Times in 42 Posts
  #2  
06-09-2019, 12:01 PM
JPMedia JPMedia is offline
Premium Member
 
Join Date: Jun 2018
Location: East Coast, USA
Posts: 121
Thanked 32 Times in 25 Posts
Quote:
Originally Posted by frekili View Post
Hi Lordsmurf, in your opinion Pro-res HQ digital copies of PAL Hi8 tapes played with a Sony EV-s9000 and converted to Pro-Res HQ files with a AJA io HD ,can be considered as archival copies? Thanks
Short answer, no.

ProRes is a video codec with lossy video compression. You need a lossless video codec such as HuffYUV or Lagarith for archival master copies of your analog captures.
Reply With Quote
  #3  
06-09-2019, 12:40 PM
sanlyn sanlyn is offline
Premium Member
 
Join Date: Aug 2009
Location: N. Carolina and NY, USA
Posts: 3,497
Thanked 1,095 Times in 907 Posts
Quote:
Originally Posted by JPMedia View Post
Quote:
Originally Posted by frekili View Post
Hi Lordsmurf, in your opinion Pro-res HQ digital copies of PAL Hi8 tapes played with a Sony EV-s9000 and converted to Pro-Res HQ files with a AJA io HD ,can be considered as archival copies? Thanks
Short answer, no.

ProRes is a video codec with lossy video compression. You need a lossless video codec such as HuffYUV or Lagarith for archival master copies of your analog captures.
Agreed. While ProRes isn't as lossy or highly compressed as some other lossy codecs, it's still lossy. It's designed for pristine higher resolution digital source, not for noisy VHS or hi8 analog. Given a good VCR and capture hardware, a lossless codec is as high-quality an archive as you'll get from analog source. Also, lossless is practically a requirement for restoration and repair.
Reply With Quote
  #4  
06-10-2019, 01:06 AM
lordsmurf's Avatar
lordsmurf lordsmurf is offline
Site Staff | Video
 
Join Date: Dec 2002
Posts: 8,633
Thanked 1,427 Times in 1,252 Posts
Quote:
Originally Posted by frekili View Post
Hi Lordsmurf, in your opinion Pro-res HQ digital copies of PAL Hi8 tapes played with a Sony EV-s9000 and converted to Pro-Res HQ files with a AJA io HD ,can be considered as archival copies? Thanks
You have multiple ProRes formats, and three ProRes422 (LT, normal, and HQ). ProRes is lossy, but was designed to be visually lossless. The "magic" of how this is achieved really is not magic at all: the bitrates are high. For SD, even higher than MPEG-2 broadcast/BD specs, which can be archival.

So, the answer is: YES, maybe.

It really depends on the source. Samples needed, attach a tiny clip (fleeting seconds, less than 00mb total) to a thread.

Quote:
Originally Posted by JPMedia View Post
Short answer, no.
ProRes is a video codec with lossy video compression. You need a lossless video codec such as HuffYUV or Lagarith for archival master copies of your analog captures.
Lossless is an intermediary codec, not to be confused with archival. Archives can also be intended to watch, so must be in some sort of pseudo-delivery format. And both ProRes and MPEG meet that demand. ProRes is actually a delivery format in broadcast, not just intermediary in home/studio.

I keep a lot of master copies as high bitrate MPEG, both 4:2:0 (a compromise) and 4:2:2 (not always compatible with home viewing, but computer fine). Note that the MPEG also has low GOP, not long GOP. Sony, for example, considers some MPEG to be good enough for an intermediary, not just delivery. It's a wide format, many options.

Quote:
Originally Posted by sanlyn View Post
- designed for pristine higher resolution digital source, not for noisy VHS or hi8 analog.
- lossless is practically a requirement for restoration and repair.
These two points are important:

Noise is the enemy of all compression.

"Archives" should mean that editing is done, restoration is done, it's simply being stored now. Unfortunately, "archiving" has multiple definitions, but most should agree it's done after a project has been completed. The idea that you'll redo it in the future is actually a fairly recent phenomena, so "archiving" is often overkill -- especially when the source has been given the best treatment possible (TBC, color correction, max SD resolution). When I think future methods may improve something, only then will I saw the large lossless file.

- Did my advice help you? Then become a Premium Member and support this site.
- Find television shows, cartoons, DVDs and Blu-ray releases at the TVPast forums.
Reply With Quote
Reply




Similar Threads
Thread Thread Starter Forum Replies Last Post
Capture formats (archival): MiniDV, DV-AVI, 8mm tapes? nicholasserra Capture, Record, Transfer 13 10-01-2017 08:21 PM
Best Hi8/Video8 archival method? RyfromNY1 Capture, Record, Transfer 4 02-14-2017 06:46 AM
Archival project: need JVC SR-W5U or SR-W7U VCR via Email or PM Project Planning, Workflows 1 03-12-2015 08:13 AM
Questions about (S-)VHS-to-PC archival hardware newkt Capture, Record, Transfer 11 05-16-2011 04:51 PM

Thread Tools



 
All times are GMT -5. The time now is 09:33 PM