For playback i use ffplay or SMplayer, both shows the same, a faster
playing video.
The encoding command is as bellow:
ffmpeg -i C:\r.mp4 -an -vcodec libx264 -threads 0 -f h264 -g 0 C:\r.264
On 21 June 2012 20:22, Alex Cohn alexc...@netvision.net.il wrote:
On Thu, Jun 21, 2012 at 4:32 AM,
Hi
I have a TRECVID database of short videos. I want to convert all of the
videos to H.264 AVC format with:
1- Not any IDR slices.
2- 1 second interval between I slices.
Would you let me know how can i achieve this by FFMPEG?
Amir
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Libav-user mailing
i have written a code for intra frame extraction out of stream, and the
code just work on i slices, IDR slices made some errors with my code.
BTW ffmpeg by proper vcodec can encode h264.avc. are you sure it cant?
I will check intra-refresh for that purpose. thanks.
On 19 June 2012 17:14, Carl
what about fixed rate i-frame interval? do you have any idea? for example i
want to generate a stream with one i-frame in every 1 second.
I have not worked with x264. can you give me more info about how to use it?
or whats the difference of x264 and FFmpeg for converting a video to h.264
avc?
Oh, Thanks Alex, In the FFMPEG DOCUMENTATION says the format of usage
should be:
‘-force_key_frames[:stream_specifier] time[,time...] (*output,per-stream*)
so for example i should write:
ffmpeg -f image2 -r 0.1 -i C:\test%1d.bmp -an -vcodec libx264 -threads 0
-f h264 -r 0.5 -force_key_frames
I have noticed that the I-Frames in a pure h264 video created by ffmpeg is
not same as what JM detect as I-Frame in the same video.
In JM software s_type=2 means I_Frame. the number of s_types frames are
always lower than what ffmpeg shows.
What is your advice?
Amir
Hi
I convert a mpeg1 video mpeg4/ AVC by the below command but i dont know why
the visual frame rate become double after conversion (fps in both are same
but tbr will be twice as the original video)
ffmpeg -i C:\Video\TrecVid-Video\2\1.mpg -r 25 -an -vcodec libx264 -threads
0 -f h264 -r 25 -g 0
Knowing that what is tbr exactly, can not solve the problem. the frame
rate are same technically, when you compare the information by ffmpeg. The
fact is that the transformed video, after using vcodec libx264, is twice
faster as the original video. when i compare the information of bot video i
I usually use SMPlayer, but even ffplay shows the same behavior (the speed
is twice so the time length is half).
my version of VLC can not play .264 files, may be i need to install a patch
or upgrade it.
On 17 May 2012 04:38, Alex Cohn alexc...@netvision.net.il wrote:
On May 16, 2012 1:45 PM,
I am confusing guys, i encountered a new problem in regard with adaptive
and fixed rate I-Frames by ffmpeg under windows. it is as below:
first i convert the original video (mpeg1) to the pure h.264 format by
below command for adaptive I-Frame rate:
ffmpeg -i C:\1.mpg -r 25 -an -vcodec libx264
OMG, when i check the I-Frames by JM software, that software shows only 3
I-Frames. how this is possible? please help me to understand where is my
problem?
On 17 May 2012 12:05, amir.ro...@rmit.edu.au wrote:
I am confusing guys, i encountered a new problem in regard with adaptive
and fixed
Hi Carl
I dont want to report a bug, i just want to know where is my problem? and
by the wayif i should not top-post here, then how can i explain my problem
to you experts?
Thanks
On 15 May 2012 15:46, Carl Eugen Hoyos ceho...@ag.or.at wrote:
amir.rouhi@... writes:
Would you explain how can
Hi to ffmpeg seniors and experts
I am using windows platform and I have created a series of video in pure
format of *.264 from raw format by the below command:
ffmpeg -f rawvideo -pix_fmt yuv420p -s 360x240 -i C:\1.yuv -an -vcodec
libx264 -threads 0 -s 360x240 -f h264 C:\1.264
I want to extract
I am looking a way to heap up all the 4x4 intra prediction modes of a video
stream in a separate file. I could do this in JM software just by adding
some fprintf function in the proper place of the code. but i am interested
to implement it in FFMPEG. Do you have any idea for this?
Is there anyone to be able to answer my question?
On 15 February 2012 16:43, amir.ro...@rmit.edu.au wrote:
The scenario is that, I have an .mpg video file. When I extract the
I-Frames from this file by below command:
ffmpeg -i D:\test\1.mpg -vsync 0 -vf select=eq(pict_type\, PICT_TYPE_I)
When somebody ask a question and don't receive any response...what does it
mean?
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Libav-user@ffmpeg.org
http://ffmpeg.org/mailman/listinfo/libav-user
Whats is that? C-C-C-C-COMBO BREAKER i have no idea toward this
On 24 February 2012 12:15, Peter Enerccio enerc...@gmail.com wrote:
C-C-C-C-COMBO BREAKER
2012/2/24 amir.ro...@rmit.edu.au
When somebody ask a question and don't receive any response...what does
it mean?
I want to know that the below command convert the input .mpg format video
to a pure h264 (MPEG4/AVC) with non-static I-Frame rate?
ffmpeg -i D:\test\1.mpg -vcodec libx264 -g 0 d:\Test\1new.mp4
as can be seen i used -vcodec libx264 for h264 format and -g 0 for non
static I-Frame rate. is that
I want to know that the below command convert the input .mpg format video
to a pure h264 (MPEG4/AVC) with non-static I-Frame rate?
ffmpeg -i D:\test\1.mpg -vcodec libx264 -g 0 d:\Test\1new.mp4
as can be seen i used -vcodec libx264 for h264 format and -g 0 for non
static I-Frame rate. is that
In windows the problem is still as before which is very wired. i checked
bellow command with different combination of single quote and double quote,
but always errors were there:
ffmpeg -i D:\test\1.mpg -vf select='eq(pict_type\,I)' -f image2
d:\Test\IFrames\I-Frm-%03d.jpeg
The problem is
When i removed the single quotes and put double quotes instead, i get
bellow errors. BTW i am using FFMPEG on windows with win xp platform. does
it make any causes for such errors?
ffmpeg -i D:\test\1.mpg -vf select=eq(pict_type\,I) -f image2
d:\Test\IFrames\I-Frm-%03d.jpeg
[select @ 01E5F940]
I know that ffmpeg is enable to extract images at any desired time interval
from a video stream. i.e the below command:
ffmpeg -i test.avi -r 1 -s WxH -f image2 test-%03d.jpeg
extract 1 second image interval from test.avi. But i dont know how to
change this command to extract just I-Frames from
Hi Guys
I want to count the different intra prediction codes (9 modes) of I-Frames
in the compressed file of any AVC MPEG-4 video. Do you have any idea to
help me how can i pars them?
Thanks for your guidance
Amir
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Libav-user mailing list
Would you please help me to find below questions?
1-Which ffmpeg function does intra frame prediction?
2-how can i use this function in my C program in windows?
Thanks
Amir
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Libav-user@ffmpeg.org
Is there anybody to help me in decoding the Intra Frame Prediction modes in
I-Frames? I have studied the H.264 reference standard (chapter 9) but still
unable to extract the intra frame prediction modes(0 to 8 for 4x4 blocks or
0 to 3 for 16x16 blocks). I know they stored in Golomb code format. Do
Hi
When i want to use ffmpeg for extracting raw images from some video stream
with 1 second iterval i use the below command:
d:\\ffmpeg -i D:\\myvideo1.mp4 -r 1 -f image2 -s 80x60 -pix_fmt yuv420p
d:\\myVideoImages\\myvideoImg-%03d.y
i use above command line in my c program by system() function. I
Please let me know which compiler do u use?
On Wed, Jul 6, 2011 at 10:58 AM, 勃 王 wb4...@yahoo.com.cn wrote:
Hello, I'm a new user of FFMPEG. It's
a such strong program. When I use it, I meet a problem. I
want to create a file with H264(video encoder) and MP3(audio
encoder) using C
at 11:15 PM, Amir Rouhi-Rmit amir.ro...@rmit.edu.au
wrote:
Please help me, I use DEV c++ compiler in windows platform. I build a
project in this compiler and add utils.c (with al its headers and
functions)
to the project, but when i want to compile the program, it does not
recognise all
dont use any ffmpeg functions directly in my code, i just call
the ffmpeg.exe with my desired switches.
On Wed, Jul 6, 2011 at 4:38 PM, Matthew Einhorn moiein2...@gmail.comwrote:
On Wed, Jul 6, 2011 at 2:16 AM, Amir Rouhi-Rmit amir.ro...@rmit.edu.au
wrote:
I am using DEV C++ developer under
that depend on those libraries for each program. .
Do i have to use 32 bit build(shared) then? Or i should use static one?
On Wed, Jul 6, 2011 at 4:38 PM, Matthew Einhorn moiein2...@gmail.comwrote:
On Wed, Jul 6, 2011 at 2:16 AM, Amir Rouhi-Rmit amir.ro...@rmit.edu.au
wrote:
I am using DEV C
? and then add appropriate header in my C codes and
then call functions? is that correct?
Thanks
On Wed, Jul 6, 2011 at 4:38 PM, Matthew Einhorn moiein2...@gmail.comwrote:
On Wed, Jul 6, 2011 at 2:16 AM, Amir Rouhi-Rmit amir.ro...@rmit.edu.au
wrote:
I am using DEV C++ developer under windows. Here i
there are some functions
that can do this for me too)
On Tue, Jul 5, 2011 at 3:25 PM, Clément Bœsch ubi...@gmail.com wrote:
On Tue, Jul 05, 2011 at 02:13:14PM +1000, Amir Rouhi-Rmit wrote:
Hellow everybody
How can i get the basic info of any video file which i need by ffmpeg?
the
information i need
. It seems that i have a problem in including new library files
or in linking. Even i add the libavecodec path for new header files location
but still does not recognise them.
On Tue, Jul 5, 2011 at 4:37 PM, Clément Bœsch ubi...@gmail.com wrote:
On Tue, Jul 05, 2011 at 04:27:16PM +1000, Amir Rouhi-Rmit
ffmpeg -codecs does not work on ffmpeg in windows.
BTW whats the difference between yuv420 and yuvj420P among different vcodec?
On Sat, Jul 2, 2011 at 11:45 PM, Alex Cohn alexc...@netvision.net.ilwrote:
On Wednesday, June 29, 2011, Amir Rouhi-Rmit amir.ro...@rmit.edu.au
wrote:
For generating
Hi everybody
I know that i can use -pix_fmt for desire pixel format in output. When i
list the different switches for this parameter i can see many formats such
as yuv420p and yuvj420p.
First i would be pleased if somebody explain whats the difference between
these two format?
secondly how can i
Hellow everybody
How can i get the basic info of any video file which i need by ffmpeg? the
information i need i just frame size and length of video. using below
command seems not standard:
ffmpeg -i path of input video
BTW is there any function in ffmpeg to call it in my c program to get my
, Saurabh Gandhi saurabh...@gmail.comwrote:
OpenCV provides wrappers to FFMPEG API. You can use that:
opencv.willowgarage.com
--
Regards,
Saurabh Gandhi
On Thu, Jun 30, 2011 at 8:30 AM, Amir Rouhi-Rmit
amir.ro...@rmit.edu.auwrote:
Hi
I need your experience regarding FFMPEG . I want
The problem still exist in opening YUV generated files. All i do is as below
please follow and inform me why i cant view the yuv files.
1- i convert a video to yuv images (1 image per second) as below:
ffmpeg -i c:\test\animals.wmv -r 1 -f image2 -s 320x240 -pix_fmt yuvj420p
c:\test\Img-%03d.yuv
will be
half-width and half-height.
Maybe you should post to ffmpeg-user?
Sincerely,
Alex
On Friday, June 17, 2011, Amir Rouhi-Rmit amir.ro...@rmit.edu.au wrote:
Thanks alot, The Y plane is quite satisfactory. but for Cb and Cr planes
separately in different images cant i use:
ffmpeg -i
I know that i can extract images of a video by ffmpeg as can be seen in
below command:
ffmpeg -i input.avi -r 1 -s WxH -f image2 Img-%03d.jpeg
But what i want is a separated Y plane and cb and cr plane. can i i achieve
this by ffmpeg? if yes pleas let me now how and if no do you suggest any
idea?
:41 PM, Alex Cohn alexc...@netvision.net.ilwrote:
You can use
ffmpeg -i input.avi -r 1 -s WxH -pix_fmt yuvj420p Img-%03d.yuv
to produce YCbCr files. Or -pix_fmt gray if you want the Y plane only.
Enjoy,
Alex
On Thu, Jun 16, 2011 at 09:02, Amir Rouhi-Rmit amir.ro...@rmit.edu.au
wrote:
I
Is there anybody to give me advice regarding how can i extract intra frame
prediction modes from compressed h.264 file? my mean is the 9 mode of 4x4
blocks and 4 mode of 16x16 blocks. I know they are stored in golomb code.
The I-Frame header and prefix is 0x 00 00 01 65 and after this bitstream
at 7:26 PM, Amir Rouhi-Rmit amir.ro...@rmit.edu.auwrote:
Hi Grzegorz
Thanks for introducing the useful links, it takes a little time to see
weather it useful for my purpose (extracting frames) or not.
regarding using sws_scale, i just wanted to know does it convert the
MPEG-4 format to raw
Hi Carson
My goal is extracting Frames from MPEG-4 AVC video in form of I-Frames.
To achieving my goal, I currently uses JM software ( Opensource MPEG-4 AVC
software from ITU-T). This software input is raw video format in YUV or RGB.
That’s why I need this type of video.
When I input a raw
Hi Spencer
Thanks for your nice guidance. It was usefull to get some idea, But as i am
interested to work on video processing in compressed domain, accessing the
i-frames should be achievable even with different speeds. I dont focous on
special time of video then extract the frames. no, I just
Hi to all Encoding and Decoding MPEG4- AVC experts
I am trying to analyse MPEG4-AVC video in compressed domain by opening the
video file in binary mode and read the bits inside. As you know , the
structure of MPEG-4 AVC video format is based on NAL(Network Abstraction
Layer) units stream which
There are also two guides that I know:
http://www.inb.uni-luebeck.de/~boehme/using_libavcodec.html (very
outdated)
http://dranger.com/ffmpeg/tutorial01.html (little outdated)
To convert AVFrame from YUV to RGB you need to use sws_scale.
Regards
Grzegorz Sz.
2011/4/7 Amir Rouhi-Rmit amir.ro
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