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Questions tagged [video-processing]

Video processing deals mostly with filtering video frames. Most common filters are noise removal, contrast and color modifications. For questions related to trimming and modifying videos use [video-editing], and [video-encoding] for questions related to editing videos into any format.

Video processing is a particular case of signal processing, which often employs video filters and where the input and output signals are video files or video streams. Video processing techniques are used in television sets, VCRs, DVDs, video codecs, video players, video scalers and other devices.

Most common filters are noise removal, contrast and color modifications. Relevant questions should include specific filters.

See also:

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Car Tracking using Optical Flow. Why isnt the vectors plotting properly

I am new to optical flow and computer vision in general and I started to work with a simple demo example from Matlab. The objective of it is to use a video and plot the motion vectors onto the screen. I am using the following code: %%…
Ali P
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Why don't I get video when exporting a movie using AVAssetExportSession?

It is trimming the audio, but the video is blank. This is the function that initiates trimming - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. self.view.backgroundColor = [UIColor…
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Remove exiftool traces from file

If I set some tag with exiftool e.g. exiftool UserComment="test" video.mp4 I can then remove it with exiftool UserComment= video.mp4 However, exiftool sets an additional tag ExifToolVersion which I cannot delete with exiftool -ExifToolVersion=…
xaxa
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Reliability of using FFMPEG in IOS application?

What i am trying to do: Trying to develop an Enterprise level IOS application with FFMPEG for video Processing. What i have done so far: Created a Linux based sample program with FFMPEG and made it work. Learnt how to use FFMPEG. I have already…
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frame to video conversion matlab

So I just started with image processing/computer vision in MATLAB. So my first task is to convert a series of images(frames) into a video. So I went through online sources (MATLAB website more specifically) to get a way to do it. So the one that I…
Ali P
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get frame rate of saved video file programatically android

I am using Media codec and I am saving the video which is fine but when I tried to encode this video I dont know on which frame rate I will get the frames and also while converting images to video.
Ahmad Arslan
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Export frames/images from compressed video

I have a compressed movie (mp4) and I want to extract every single frame / image from it. I know that each individual frame of the video only contains the changed pixels regarding to the last keyframe, because of the video compression. But that is…
Jan Viehweger
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OpenCV video writer change video on save

I trying to load video, do some color manipulations and save it. I change first color component, save video, open it again, but color component is different now! int main(int argv, char * argc) { std::string inVideo = "sample_sorenson.mov"; …
uNmAnNeR
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Combining multiple features vector, HOG and LBP

I am working on people detection using two feature descriptor, HOG and LBP. So far, I combine both of the features using a simple concatenation. But it shows me sometimes problem due to big vectors. Here is my code. %extract features from negative…
Indrasyach
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AVFoundation creating video from images wrong Frame Rate

I’m trying to create a video from images using AVFoundation. There are already multiple threads regarding this approach, but I believe many of them have the same issue as I’m a facing here. The video plays fine on the iPhone but it doesn’t play on…
aumanets
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Android with OpenCL video processing

I am making an Android app to test the differences between OpenCL and RenderScript. Right now I'm trying to optimize the video processing code of OpenCL but I can only process the first frame and all others are black. All my functies work with…
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Why ffmpeg-split AVI movie freezes when played

I used ffmpeg to split AVI movies like ffmpeg -i input.avi -vcodec copy -acodec copy -ss 00:22:33 -to 1:2:3 out.avi But the output file out.avi is sometimes weird when played (in MPlayerX, for example) -- it will stop at the first frame, freezing…
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Sum of Absolute differences between images in Matlab

I want to implement sum of absolute difference in Matlab to establish a similarity metric between between one video frame and 5 frames either side of this frame (i.e. past and future frames). I only need the SAD value for the co-located pixel in…
trican
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cannot open video using opencv on linux

I am trying to open a video file (.MOV,.AVI or .MP4) using OpenCV on linux. So that I can extract specific frames as images on the disc and do image processing. I have also installed ffmpeg on linux. My code snippet is : CvCapture* capture =…
user3358147
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Error when trying to upload video on dailymotion with Graph API

I am trying to upload video on dailymotion using graph API here: http://www.dailymotion.com/doc/api/graph-api.html Authenticated successfully with read and write permission but when trying to upload video using below api publishing method:…
Huzoor Bux
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