Video Stabilization with OpenCV

I can suggest one of the following solutions: Using local high level features: OpenCV includes SURF, so: for each frame, extract SURF features. Then build feature Kd-Tree (also in OpenCV), then match each two consecutive frames to find pairs of corresponding features. Feed those pairs into cvFindHomography to compute the homography between those frames. Warp … Read more

Android: how to play video from assets?

Instead of accessing from assests,You must copy the video into your project’s res/raw folder. Create raw folder under res folder. It must be in a supported format (3gp, wmv, mp4 ) and named with lower case, numerics, underscores and dots in its filename likewise:video_file.mp4. VideoView view = (VideoView)findViewById(R.id.videoView); String path = “android.resource://” + getPackageName() + … Read more

Getting video dimension / resolution / width x height from ffmpeg

Use ffprobe Example 1: With keys / variable names ffprobe -v error -show_entries stream=width,height -of default=noprint_wrappers=1 input.mp4 width=1280 height=720 Example 2: Just width x height ffprobe -v error -select_streams v -show_entries stream=width,height -of csv=p=0:s=x input.m4v 1280×720 Example 3: JSON ffprobe -v error -select_streams v -show_entries stream=width,height -of json input.mkv { “programs”: [ ], “streams”: [ … Read more

How to merge videos by avconv?

mp4 files cannot be simply concatenated, as the “accepted” answer suggests. If you run that, and that alone, you’ll end up with output.mp4 having only the contents of file1.mp4. That said, what you’re looking to do in the original question can in fact be done, as long as you split original file into mpeg streams … Read more

Posting video on instagram using hooks

Instagram’s API doesn’t directly support uploading anything from 3rd party applications. Therefore you have to do some ugly user experience compromises when providing the functionality to your users. First, Prepare the video you want to upload to Instagram and store the path to it somewhere Second, Save it to the user’s Camera Roll: if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(filePath)) … Read more

Vimeo full width [duplicate]

The magic padding number you create for the container needs to match the aspect ratio of the video. If you inspect the video on vimeo, the res is 1296×540. To get the aspect ratio percentage, divide 540 / 1296 * 100% = 41.66666667% padding. Here’s a fiddle since the video doesn’t seem to play well … Read more

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