[FFmpeg-devel] [PATCH] doc/codecs: Add missing documentation for hwaccel_flags.

Jun Zhao mypopydev at gmail.com
Tue Jan 2 07:59:12 EET 2018

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From e030510864c28d4b17c8d1eb09ab00f274bf5dcc Mon Sep 17 00:00:00 2001
From: Jun Zhao <jun.zhao at intel.com>
Date: Tue, 2 Jan 2018 13:55:29 +0800
Subject: [PATCH] doc/codecs: Add missing documentation for hwaccel_flags.

document the hwaccel_flags option for decoding.

Signed-off-by: Jun Zhao <jun.zhao at intel.com>
 doc/codecs.texi | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/doc/codecs.texi b/doc/codecs.texi
index 7e20374334..190f03b293 100644
--- a/doc/codecs.texi
+++ b/doc/codecs.texi
@@ -1254,6 +1254,33 @@ ffprobe -dump_separator "
 Maximum number of pixels per image. This value can be used to avoid out of
 memory failures due to large images.
+ at item hwaccel_flags @var{flags} (@emph{decoding,video})
+Set hardware accelerated decoding flags. (if active)
+Possible values:
+ at table @samp
+ at item ignore_level
+Ignore level, should be used for decoding even if the codec level used is unknown
+or higher than the maximum supported level reported by the hardware driver.
+It's generally a good idea to pass this flag unless you have a specific
+reason not to, as hardware tends to under-report supported levels.
+ at item allow_high_depth
+Allow to output YUV pixel formats with a different chroma sampling than 4:2:0
+and/or other than 8 bits per component
+ at item allow_profile_mismatch
+Attempt to decode anyway if hardware accelerated decoder's supported profiles do not
+exactly match the stream.
+For example, this can be used to try to decode baseline profile H.264
+streams in hardware - it will often succeed, because many streams marked
+as baseline profile actually conform to constrained baseline profile.
+Warning: If the stream is actually not supported then the behaviour is
+undefined, and may include returning entirely incorrect output
+while indicating success.
+ at end table
 @item apply_cropping @var{bool} (@emph{decoding,video})
 Enable cropping if cropping parameters are multiples of the required
 alignment for the left and top parameters. If the alignment is not met the

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