----- Original Message -----
From: "Carl Eugen Hoyos" <[email protected]>
To: <[email protected]>
Sent: Tuesday, December 10, 2013 6:12 PM
Subject: Re: [Libav-user] packet flag AV_PKT_FLAG_KEY
Don Moir <donmoir@...> writes:
Not sure what AV_PKT_FLAG_KEY is supposed to mean.
The assumption to me early on is it represented a key
frame but not necessarily.
Apart from the fact that I simply don't understand the
second sentence:
Hard to understand is right and still tring to understand.
What is missing here imo is what is unclear in your opinion
about the documentation (or for which input stream the
documentation does not match the behaviour).
Note that valid H.264 streams do not necessarily contain
keyframes and therefore do not necessarily contain packets
with this flag set.
Carl Eugen
Yes I understand about H.264. The confusion is when there are known key frame index_entries and these do represent at least a start
point for a key frame. Now seems AV_PKT_FLAG_KEY should dovetail with those entries but it does not.
If you look around some you find confusion about the usage of AV_PKT_FLAG_KEY. If this is used internally for some special case,
then IMO another flag should have been used. The intent of the flag is just not documented well. Ideally I think it should mark the
start of a key frame and at least dovetail with index_entries but I am sure it goes deeper than that.
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