Welcome to Doom9's Forum, THE in-place to be for everyone interested in DVD conversion.

Before you start posting please read the forum rules. By posting to this forum you agree to abide by the rules.

 

Go Back   Doom9's Forum > Video Encoding > High Efficiency Video Coding (HEVC)

Reply
 
Thread Tools Search this Thread Display Modes
Old 23rd December 2013, 19:05   #1  |  Link
benwaggoner
Moderator
 
Join Date: Jan 2006
Location: Portland, OR
Posts: 4,752
IDR versus CDR for single-stream DASH

I've been playing around with DASH packaging of HEVC, as DASH seems to what most folks are talking about doing for adaptive streaming of HEVC.

I've been encoding with x265 and packaging with mp4box.

For DASH content that need to do seamless bitrate switching, I'd obviously have to set --refresh IDR (aka Closed GOP).

But if I am making a single-stream DASH package, can I just leave it at the default of CDR (aka Open GOP)? Or do I need to use IDR there as well? I'm getting only a single mdat packaging from a test stream, and I'm wondering if using CDR might be why.
__________________
Ben Waggoner
Principal Video Specialist, Amazon Prime Video

My Compression Book
benwaggoner is offline   Reply With Quote
Old 1st January 2014, 03:36   #2  |  Link
pieter3d
Registered User
 
Join Date: Jan 2013
Location: Santa Clara CA
Posts: 114
Do you mean a CRA picture? CRAs may be followed by leading pictures that may or may not be decodable. IDR pictures may not be followed by undecodable leading pictures (RADL vs RASL). Also an IDR starts a new Coded Video Sequence (CVS), CRA does not necessarily.
pieter3d is offline   Reply With Quote
Old 1st January 2014, 04:23   #3  |  Link
benwaggoner
Moderator
 
Join Date: Jan 2006
Location: Portland, OR
Posts: 4,752
Quote:
Originally Posted by pieter3d View Post
Do you mean a CRA picture? CRAs may be followed by leading pictures that may or may not be decodable. IDR pictures may not be followed by undecodable leading pictures (RADL vs RASL). Also an IDR starts a new Coded Video Sequence (CVS), CRA does not necessarily.
x265 called it CDR, but it's probably the same thing.

It definitely seems to be better to use IDR for adaptive streaming.
__________________
Ben Waggoner
Principal Video Specialist, Amazon Prime Video

My Compression Book
benwaggoner is offline   Reply With Quote
Old 4th January 2014, 04:55   #4  |  Link
pieter3d
Registered User
 
Join Date: Jan 2013
Location: Santa Clara CA
Posts: 114
If you have the clips, one of each, I can tell you how it is being done.
pieter3d is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 06:25.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.