video-processing

I'm looking to implement a function that retrieves a single frame from an input video, so I can use it as a thumbnail. Something along these lines should work: // filename examples: "test.avi", "test.dvr-ms" // position is from 0 to 100 percent (0.0 to 1.0) // returns a bitmap byte[] GetVideoThumbnail(string filename, float position) { } Does anyone know how to do this in .Net 3.0? The correct solution will be the "best" implementation of this function. Bonus points for avoiding selection of blank frames. I ended up rolling my own stand alone class (with the single method I described), the

I've browsed the internet for this very intensively, but I didn't find what I needed, only variations of it which are not quite the thing I want to use. I've got several videos in different lengths and I want to extract 20 images out of every video from start to the end, to show the broadest impression of the video. So one video is 16m 47s long => 1007s in total => I have to make one snapshot of the video every 50 seconds. So I figured using the -r switch of ffmpeg with the value of 0.019860973 (eq 20/1007) but ffmpeg tells me that the framerate is too small for it... The only way I figured

I have a web page, which (among other things) needs to extract a specific frame from a user-uploaded video. The user seeks to a particular part of a .mp4 in the player, then clicks a button, and an ajax call gets fired off to a php script which takes the .mp4, and the exact time from the video, and uses that to extract a "thumbnail" frame. My current solution is using the php exec command: exec("ffmpeg -i $videoPath -ss $timeOffset -vframes 1 $jpgOutputPath"); ...which works just great, except it's as slow as molasses. My guess is that ffmpeg is a little too much for the job, and I might be

This question might be very basic Is there a way to reduce the frame size/rate of Lossy compressed (WMV, MPEG) format, to get a smaller video, of lesser size, with same format. Are there any open source or proprietary apis for this? Jason B ffmpeg provides this functionality. All you need to do is run someting like ffmpeg -i <inputfilename> -s 640x480 -b 512k -vcodec mpeg1video -acodec copy <outputfilename> For newer versions of ffmpeg you need to change -b to -b:v : ffmpeg -i <inputfilename> -s 640x480 -b:v 512k -vcodec mpeg1video -acodec copy <outputfilename> to convert the input video file

I've integrated opencv in Swift IOS project using bridging header (to connect Swift to Objective C) and a Objective C wrapper (to connect Objective C to C++). Using this method I can pass single images from the Swift code, analyse them in the C++ files and get them back. I've seen that opencv provides CvVideoCamera object that can be integrated with an Objective C UIViewController. But since my UIViewController are written in Swift I've wondered if this is possible as well? Anatoli P This is an update to my initial answer after I had a chance to play with this myself. Yes, it is possible to

I have two videos that I'd like to combine into a single video, in which both videos would sit on top of a static background image. (Think something like this .) My requirements are that the software I use is free, that it runs on OSX, and that I don't have to re-encode my videos an excessive number of times. I'd also like to be able to perform this operation from the command line or via script, since I'll be doing it a lot. (But this isn't strictly necessary.) I tried fiddling with ffmpeg for a couple of hours, but it just doesn't seem very well suited for post-processing. I could potentially

I am developing media server for Play station 3 in iPhone. I came to know that PS3 doesn't support .MOV file so I have to convert it into Mp4 or something other transcode which PS3 support. This is what I have done but it crashes if I set different file type than its source files. AVURLAsset *avAsset = [AVURLAsset URLAssetWithURL:videoURL options:nil]; NSArray *compatiblePresets = [AVAssetExportSession exportPresetsCompatibleWithAsset:avAsset]; if ([compatiblePresets containsObject:AVAssetExportPresetLowQuality]) { AVAssetExportSession *exportSession = [[AVAssetExportSession alloc