Hi Alex,
See http://ffmpeg.gusari.org/viewtopic.php?f=12t=624. For ffmpeg
command line, you can specify the UDP buffer size in the URL, e.g.
udp://localhost:5002?fifo_size=100.
Thanks. I did actually see this post, though I get errors from the
overrun_nonfatal argument.
Buy if you get
Then you don't need avfilter, IMHO. When you receive a decoded frame
from avcodec, simply check if the last frame was received more than 40
ms ago.
Actually, I'm not sure how to do this for the following reason:
I prefer to decode and process frames even before they would have been
Check the PTS of each frame and use that to decide whether to throw it out or
not. That way there is no need to decode frames you won't be using.
--
View this message in context:
Hi Mike,
On Tue, Jul 30, 2013 at 11:13 AM, mikeversteeg m...@mikeversteeg.com wrote:
Check the PTS of each frame and use that to decide whether to throw it out or
not.
Ah, thanks.
These will give me the play-timestamps, right?
That way there is no need to decode frames you won't be using.
I convert AVI to MPEG with folowing command:
avconv -i file.avi -c:v mpeg2video -b:v 6000k -c:a mp2 -b:a 384k file.mpg
When the MPG file has been burned to DVD it is hard to read afterthat.
The DVD on the computer starts to make noise and to read slow the DVD.
Also it is hard to watch directly -
Thanks!
On Tue, Jul 30, 2013 at 1:24 PM, Robert Krüger krue...@lesspain.de wrote:
Hi,
On Tue, Jul 30, 2013 at 12:19 PM, Ivaylo Spasov ivaylo@gmail.com wrote:
I convert AVI to MPEG with folowing command:
avconv -i file.avi -c:v mpeg2video -b:v 6000k -c:a mp2 -b:a 384k file.mpg
I know
On Tue, Jul 30, 2013 at 12:35 PM, Adi Shavit adisha...@gmail.com wrote:
Hi Mike,
On Tue, Jul 30, 2013 at 11:13 AM, mikeversteeg m...@mikeversteeg.com wrote:
Check the PTS of each frame and use that to decide whether to throw it out or
not.
Ah, thanks.
These will give me the
On Tue, Jul 30, 2013 at 10:20 AM, Adi Shavit adisha...@gmail.com wrote:
Then you don't need avfilter, IMHO. When you receive a decoded frame
from avcodec, simply check if the last frame was received more than 40
ms ago.
Actually, I'm not sure how to do this for the following reason:
I
Hi Alex,
You must decode all frames, or skip to the next IDR frame, if you want
to avoid artifacts. Yes PTS is play timestamp. The units may depend
on your stream format, and are generally expressed in terms of the
timebase.
That's what I thought.
How do I detect an IDR (or non-IDR) frame?
Yes, I understand now.
Thanks.
Adi
Well, when I wrote 40 ms ago I actually mean 40 ms after the
previous frame. Often, you can use PTS for that measurement. But it
may also be not bad to register time of arrival of each frame, and
base your processing strategy on these timestamps.
Regards,
Hello people,
could anyone provide a minimal example of how to encode a .mkv video using
H.264 Encoding from QImages? I have tried a lot of different settings and
can not make it work. This would be great!
Thanks in advance!
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On Tue, Jul 30, 2013 at 9:37 AM, Adi Shavit adisha...@gmail.com wrote:
Note that overrun_nonfatal will break the video output. If the network
is very bad, and you have IDR frames sent often enough, or if you use
an intra-refresh stream.
Sorry, I don't understand what this means.
Basically,
On 7/30/13, Luis Brocan Broki brocanh...@gmail.com wrote:
Hi everyone!
I'm currently developing a program that reads the motion_val table in each
frame for doing some computations. The problem if since i've upgraded to
ffmpeg 2.0 (i come from avcodec-53 version), the second level of
It's a deprecated parameter in AVFrame structure (as well as motion val
3-dimensional array), which i use to compute motion vectors in old versions
of ffmpeg.
If these parameteres has gone from codebase, how i can get now the motion
vectors?
Thanks in advance!
2013/7/30 Paul B Mahol
snip
You can skip h264 post-processing to save decoding time.
How do I do this programatically?
I didn't actually configure and codec explicitly, it was automatically
selected. I don't even know when the stream will be H.264.
Other than that, if you detect that your process takes too long,
Hi Tushar Paithankar
Used mono clip(produced by audacity) for decoding purpose and again getting
noise. My code is exact of the decoding_encoding.c except the main
function. Can you provide me any tutorial?
Regards
Tariqul Islam
On Mon, Jul 29, 2013 at 4:19 PM, Tushar Paithankar
Hi Mr. Tushar
Decoding part is complete, fault was not removing header part from raw
data. Audacity is giving clear sound for raw data of any mp2 file.
But still working with encoding :(
Regards,
Tariqul Islam
On Tue, Jul 30, 2013 at 5:17 PM, Tariqul Islam tariqul.i...@gmail.comwrote:
Hi
On Tue, Jul 30, 2013 at 2:16 PM, Adi Shavit adisha...@gmail.com wrote:
You can skip h264 post-processing to save decoding time.
How do I do this programatically?
I didn't actually configure and codec explicitly, it was automatically
selected. I don't even know when the stream will be H.264.
On Tue, Jul 30, 2013 at 2:16 PM, Adi Shavit adisha...@gmail.com wrote:
How do I detect an IDR (or non-IDR frame)?
Can I freely discard non-IDR frames without decoding them?
Look for AV_PKT_FLAG_KEY in packet-flags
Alex
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How do I do this programatically?
I didn't actually configure and codec explicitly, it was automatically
selected. I don't even know when the stream will be H.264.
See, for example,
http://ffmpeg.org/pipermail/ffmpeg-devel/2011-October/115966.html.
Thanks.
You can also try to use
Great!
If I want to drop a particular frame, and (0 == AV_PKT_FLAG_KEY
packet-flags) then I can just skip the whole packet and no even
decode it.Cool.
On Tue, Jul 30, 2013 at 5:15 PM, Alex Cohn alexc...@netvision.net.il wrote:
On Tue, Jul 30, 2013 at 2:16 PM, Adi Shavit adisha...@gmail.com
On Tue, Jul 30, 2013 at 5:31 PM, Adi Shavit adisha...@gmail.com wrote:
Great!
If I want to drop a particular frame, and (0 == AV_PKT_FLAG_KEY
packet-flags) then I can just skip the whole packet and no even
decode it.Cool.
Wrong. If you drop a frame, then you must drop all frames after it
On Jul 30, 2013, at 21:26 , Adi Shavit wrote:
You can also try to use multithreaded decoder. But this is not going
to help if you have more video streams in parallel than CPU cores.
I can give it a shot.
How do I set it up?
I think Alex means something like this, here as an example with
Wrong. If you drop a frame, then you must drop all frames after it
until you have (0 != AV_PKT_FLAG_KEY packet-flags).
Aha, thanks for the clarification.
Not as useful as I had hoped...
Adi
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Libav-user@ffmpeg.org
Doesnt the decoder do this as default? If I just use the API to decode a
video it creates multiple threads automatically.
Kalileo wrote:
On Jul 30, 2013, at 21:26 , Adi Shavit wrote:
You can also try to use multithreaded decoder. But this is not going
to help if you have more video streams
Hi ,
Good now its very simple. You have to read a row frame. There is simple
calculation for calculating raw frame size. For mono audio I.e pcm file frame
size is 1024*2*1. (1024*bit depth*no of channels ). For 16 bit pcm bit depth is
2. So for mono input yor have to give (1024*2*1) bytes
On Jul 30, 2013, at 22:18 , Vahid Kowsari wrote:
Kalileo wrote:
I think Alex means something like this, here as an example with 2 threads:
AVDictionary *opts = NULL;
av_dict_set(opts, threads, 2, 0);
if (avcodec_open2(pVideoCodecCtx, pVideoCodec, opts)
…
Doesnt the decoder do
Hi,
I ported an application, with ffmpeg, which is working on QNX x86 to QNX
armv7.
I cross compiled the ffmpeg on a linux machine with the QNX momentics suite
tools.
I can't compile the library directly on the QNX armv7 device so I had to
cross compile it.
My configure was following:
Pavel Vazharov pvazharov@... writes:
./configure --enable-gpl \
--enable-nonfree
Unrelated:
The only effect that this option has in your
configure line is that you are not allowed to
distribute any binaries based on this compile,
so please remove it.
[...]
When I started the application
Ivaylo Spasov ivaylo.pif@... writes:
I convert AVI to MPEG with folowing command:
avconv
To elaborate:
avconv contains several hundred known bugs that
are not reproducible with ffmpeg, some of them
security relevant, please understand that we
therefore cannot support it here.
See
Marika Marszalkowski marikaner@... writes:
I have tried a lot of different settings and can
not make it work.
Command line including complete, uncut console output /
source code missing.
Carl Eugen
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Hi all,
I am currently trying to figure out how to resolve the output pad no
source found error from a modification of the ffmpeg audio filter example
because I am using a filter that requires 2 or more inputs.
However, I am having trouble understanding exactly what AVFilterPad,
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