On 10/20/13, Robert Krueger krue...@lesspain.de wrote:
Hi,
I have AVCHD files from a camera (Panasonic Lumix GH1) that demux and
decode with libavformat/libavcodec detecting no other keyframe but the
first (both, the first video packet and video frame are marked as
keyframe), which is not
On Fri, Oct 25, 2013 at 5:59 PM, Paul B Mahol one...@gmail.com wrote:
On 10/20/13, Robert Krueger krue...@lesspain.de wrote:
Hi,
I have AVCHD files from a camera (Panasonic Lumix GH1) that demux and
decode with libavformat/libavcodec detecting no other keyframe but the
first (both, the first
On Mon, Oct 21, 2013 at 8:26 PM, Carl Eugen Hoyos ceho...@ag.or.at wrote:
Robert Krüger krueger@... writes:
I was interested to know how you found out that
ffmpeg thinks the 28th frame is a random access
point
I concatenated the second until the 29th frame of the
input sample and tested
On Tue, Oct 22, 2013 at 1:03 PM, Carl Eugen Hoyos ceho...@ag.or.at wrote:
Carl Eugen Hoyos cehoyos@... writes:
Robert Krüger krueger at ... writes:
I just cut away everything from the file until the start
of the packet containing the 27th frame
(tail -c4329532 gh1_720p.mts
Robert Krüger krueger@... writes:
Afaict, the 27th frame is not shown, ffmpeg thinks
that it is no random access point.
What do you mean by not shown?
It is not decoded unless flags2 showall is used because
FFmpeg thinks the 27th frame is not a random access
point.
Carl Eugen
Robert Krüger krueger@... writes:
Afaict, the 27th frame is not shown, ffmpeg thinks
that it is no random access point.
What do you mean by not shown?
It is not decoded unless flags2 showall is used because
FFmpeg thinks the 27th frame is not a random access
point.
You are
On Tue, Oct 22, 2013 at 3:06 PM, Carl Eugen Hoyos ceho...@ag.or.at wrote:
Robert Krüger krueger@... writes:
Afaict, the 27th frame is not shown, ffmpeg thinks
that it is no random access point.
What do you mean by not shown?
It is not decoded unless flags2 showall is used because
Carl,
sorry to butt in, but you mentioned earlier:
I was under the impression that lavf/lavc support recovery
points very well (even in slightly broken streams), ie
that you (as a user) can choose if you only want to seek to
a recovery point (slower, done by ffplay) or to some frame
no matter if
Robert Krüger krueger@... writes:
In case of the files I am talking about here, there are no recovery
point SEIs after the first frame so libavformat/avcodec is probably
doing everything correctly, too. Since I think I know that these
streams in fact do have random access points, I will
Robert Krüger krueger@... writes:
If my debug output is correct, both contain no
B-slices/frames (I just noticed that) but they
do contain I-slices/frames. If I am not missing
something, those I-Frames should be valid random
access points then.
Do you mean you debugged the sample (with
On Mon, Oct 21, 2013 at 4:21 PM, Carl Eugen Hoyos ceho...@ag.or.at wrote:
Robert Krüger krueger@... writes:
If my debug output is correct, both contain no
B-slices/frames (I just noticed that) but they
do contain I-slices/frames. If I am not missing
something, those I-Frames should be valid
Robert Krüger krueger@... writes:
Since only P- and I-slices are parsed (I can see that
in the debug output), I would indeed expect every
I-frame (meaning any frame only consisting of one
I-slice in the stream) to be a valid access point
So you mean a P-frame after an I-frame is not
Robert Krüger krueger@... writes:
Even better. Which commit are you talking about?
Iirc, fixed ticket with keyword h264.
You mean 2738?
I believe this is the one I meant.
Carl Eugen
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On Mon, Oct 21, 2013 at 6:38 PM, Carl Eugen Hoyos ceho...@ag.or.at wrote:
Robert Krüger krueger@... writes:
Btw, is it intentional that you don't answer questions
I ask in my emails?
Please understand that you know much more than I do about
H.264 so I simply cannot answer most of your
Robert Krüger krueger@... writes:
I was interested to know how you found out that
ffmpeg thinks the 28th frame is a random access
point
I concatenated the second until the 29th frame of the
input sample and tested decoding with current FFmpeg.
I also wanted to test with the reference
Hi,
I have AVCHD files from a camera (Panasonic Lumix GH1) that demux and
decode with libavformat/libavcodec detecting no other keyframe but the
first (both, the first video packet and video frame are marked as
keyframe), which is not what I would have expected for those clips as
the GOP
Robert Krüger krueger@... writes:
I have AVCHD files from a camera (Panasonic Lumix GH1) that demux and
decode with libavformat/libavcodec detecting no other keyframe but the
first (both, the first video packet and video frame are marked as
keyframe), which is not what I would have expected
Robert Krüger krueger@... writes:
So are you saying that AVPacket.key_frame should be
set to 1 for recovery points in H.264?
No, on the contrary, I don't think this would work
(depending on the definition of work) in the sense
that the frame marked as key_frame cannot be
independently
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