Monday, April 4, 2016

Re: [Avid-L2] Laptop Media Composer for XAVC editing - best configuration and workflow

 



Mark,
I think it can be both. Probably you're right that if it's called -I it's intraframe :-)
My main goal was to make clear that one cannot judge image quality by size only.
 
Bouke
VideoToolShed
van Oldenbarneveltstraat 33
6512 AS  NIJMEGEN, the Netherlands
+31 24 3553311
----- Original Message -----
Sent: Monday, April 04, 2016 2:03 AM
Subject: Re: [Avid-L2] Laptop Media Composer for XAVC editing - best configuration and workflow

 

Bouke - isn't XAVC interframe compression, and XAVC-I intraframe compression? Interframe requires the look forward/backward processes, but intraframe means each frame is compressed independently. For example, DNxHD 36 is intraframe compression, but MPEG-2 is interframe. I would think that intraframe compression would be easier on CPU. However, the special case with XAVC-I is that it's H.264, and therefore, harder for CPU to decompress. I'm willing to concede here on the specifics, just thought all this time it was interframe = complex, intraframe = simple.

On Sun, Apr 3, 2016 at 8:49 AM, 'Edit B' bouke@editb.nl [Avid-L2] <Avid-L2@yahoogroups.com> wrote:
 



To be utterly correct, It's slightly more complex than that.
It's not about the AMOUNT of compression, it's about the KIND of compression. Intra frames require to look around more frames to be able to decode a given frame. That takes time and math.
DNxHD 36 is VERY HIGH compression, but still very easy to decode since it's I frame only.
 
And yes, File size does not say anything about quality unless the kind of compression and resolution is the same.
But even then, on a VBR codec a large file may be worse than a small file. Noise free clouds / macro shots are way easier to compress than noisy images where everything is in focus.
 
Bouke
 
VideoToolShed
van Oldenbarneveltstraat 33
6512 AS  NIJMEGEN, the Netherlands
+31 24 3553311
----- Original Message -----
Sent: Saturday, April 02, 2016 10:28 PM
Subject: Re: [Avid-L2] Laptop Media Composer for XAVC editing - best configuration and workflow

 

Intra-frame codecs are considerably more compressed than DNx, so yes, the files are smaller. The extra compression is what makes them more painful to edit with.

D.

Sent from my mobile phone - please excuse spellung.
   
On 2 Apr 2016 9:11 p.m., "hartfilms@earthlink.net [Avid-L2]" <Avid-L2@yahoogroups.com> wrote:
>
>  
>
> Thank you, John. I notice that Sony has a plug-in for its AVCI cameras that is supposed to work with AMA. Problems there? I love DNxHD but I have to convince the people responsible for acquisition to record to DNxHD. Are those files larger than AVC Intra? - Jayasri
>
>

Sent from my mobile phone - please excuse spellung.
   


This email has been sent from a virus-free computer protected by Avast. www.avast.com



Virus-free. www.avast.com

__._,_.___
Posted by: "Edit B" <bouke@editb.nl>
Reply via web post • Reply to sender • Reply to group • Start a New Topic • Messages in this topic (14)
Have you tried the highest rated email app?
With 4.5 stars in iTunes, the Yahoo Mail app is the highest rated email app on the market. What are you waiting for? The Yahoo Mail app is fast, beautiful and intuitive. Try it today!
this is the Avid-L2

.

__,_._,___
Posted by Video Geek Squad at 3:52 AM

No comments:

Post a Comment

Subscribe to: Post Comments (Atom)