video-processing

In my Windows 8 Store Application, I tend to perform live video stream processing (Face detection for example). Technique 1 In my previous Windows 7 application, I was able to use the following technique ( Camera Face Detection in C# Using Emgu CV (OpenCV in .NET) and WPF ) to perform live video processing. The technique was, having a fixed period timer callback, to actively query image buffer from camera object . void timer_Tick(object sender, EventArgs e) { Image<Bgr,Byte> currentFrame = capture.QueryFrame(); // Perform image processing based on currentFrame Technique 2 Another technique I

I am trying to read a series of images from a folder using OpenCV's VideoCapture function. After some search on the internet, my current code is like this: cv::VideoCapture cap ( "C:\\Users\\Admin\\Documents\\Images\\%02d.jpg"); I was expecting to see that VideoCapture function should read all the images in that folder with names of two serial digits, like 01.jpg, 02.jpg, ..., 30.jpg . Someone told on the internet that the VideoCapture function should be ale to catch all of these images once I give the first image's location and name. So I also tried to do it like this: cv::VideoCapture cap (

I'm trying to use ffmpeg to split an input file into two separate files: An MP4 with only R,G and B channels An MP4 with the "extracted" A channel (a so-called Key clip, see http://ffmpeg-users.933282.n4.nabble.com/quot-Extracting-quot-Alpha-Channel-td3700227.html ) I've managed to do both, but now I want to combine them into one single command. Here's what I do: ffmpeg -r $FPS -y -i input.flv -vcodec libx264 -vpre ipod640 -acodec libfaac -s 256x256 -r $FPS -filter_complex INSERT_FILTER_HERE rgb.mp4 alpha.mp4 where INSERT_FILTER_HERE is: format=rgba, split [rgb_in][alpha_in]; [rgb_in] fifo,

I have gotten the SPS in NALU ( AVC Decoder Configuration Record ), and trying to parse the video width / height from it. 67 64 00 15 ac c8 60 20 09 6c 04 40 00 00 03 00 40 00 00 07 a3 c5 8b 67 80 This is my code parse the SPS but gets the wrong values. pic_width_in_mbs_minus1 is 5, and pic_height_in_map_units_minus1 is 1. Actually the video is 512 X 288px typedef struct _SequenceParameterSet { private: const unsigned char * m_pStart; unsigned short m_nLength; int m_nCurrentBit; unsigned int ReadBit() { ATLASSERT(m_nCurrentBit <= m_nLength * 8); int nIndex = m_nCurrentBit / 8; int nOffset = m

I have scenario for creating a video files using diff. assets like images, audio file. What I want to do is, Find audio files from the particular folder and set it as background music, and fetch images from particular folder and show those images one by one. So basically I have images and audio files and I want create a video file using those assets using PHP. Can any one please suggest the start up point for this? Have done image capture from video and converting the video using Ffmpeg so I have think of Ffmpeg but, I think it will not allow to create a video. ffmpeg will allow you to create