From 2286f6c1a642310f8d42523a1a784b0a8e7dfb8b Mon Sep 17 00:00:00 2001 From: Yannis Guyon Date: Tue, 17 Sep 2024 11:41:16 +0000 Subject: [PATCH] Replace AV1 still_picture=1 shoulds with a note (#228) --- index.bs | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/index.bs b/index.bs index 271f7c5..6dd328e 100755 --- a/index.bs +++ b/index.bs @@ -174,9 +174,8 @@ When an item is of type av01, it is - The content of an [=AV1 Image Item=] is called the AV1 Image Item Data and shall obey the following constraints: - The [=AV1 Image Item Data=] shall be identical to the content of an [=AV1 Sample=] marked as 'sync', as defined in [[!AV1-ISOBMFF]]. - The [=AV1 Image Item Data=] shall have exactly one [=Sequence Header OBU=]. - - If the [=AV1 Image Item Data=] consists of a single frame (i.e. when using a single layer), - - It should have its [=still_picture=] flag set to 1. - - It should have its [=reduced_still_picture_header=] flag set to 1. + +NOTE: File writers may want to set the [=still_picture=] and [=reduced_still_picture_header=] flags to 1 when possible in the [=Sequence Header OBU=] part of the [=AV1 Image Item Data=] so that AV1 header overhead is minimized.

Image Item Properties

@@ -857,3 +856,4 @@ Other versions of the boxes shall not be used. "-" means that the box does not h - EDITORIAL: Update list of other item properties - Further clarify relationship between av1C, metadata OBUs and item properties - Add information on tmap, grpl and altr + - Replace recommendations regarding still picture flags in image items by a note