image-extraction | 易学教程

FFmpeg code not working on http url for thumbnail extraction

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问题 I am trying to extract thumbnail from sharepoint 2013 video library. I found a link which can extract using ffmpeg. this is the link: [How can I save first frame of a video as image? filename = "http://siteurl/" + items["FileRef"].ToString(); When i replaced the input file with sharepoint site url and video name then it does not produce any thumbnail. I also gives error on ffmpeg.Start(); ffmpeg.WaitForExit(); ffmpeg.Close() I would like to understand how make it work for http url. If it is

ffmpeg 1FPS extraction call spits out infinite images until disk is bricked on poorly-encoded movie

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问题 This is one of the oddest things I've ever seen while using ffmpeg. This is the scenario - we are getting video footage from a IONODE ION-E100 encoder, the footage is encoded in h264. I can view the footage fine in VLC, and I can copy it over to another video using ffmpeg and -c:v copy . The issue arises when I try and extract one FPS from the movie using the following command: ffmpeg -i testmovie.mp4 -r 1 -vf 640:-2 -q:v 18 -loglevel error /tmp/tmp/extraction_%04d.jpeg What this should do is

How can I save first frame of a video as image?

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I want to extract first frame of uploaded video and save it as image file. Possible video formats are mpeg, avi and wmv. One more thing to consider is that we are creating an ASP.NET website. You could use FFMPEG as a separate process (simplest way) and let it decode first IDR for you. Here you have a class FFMPEG that has GetThumbnail() method, to it you pass address of video file, address of the JPEG image to be made, and resolution that you want the image to be: using System.Diagnostics; using System.Threading; public class FFMPEG { Process ffmpeg; public void exec(string input, string

How can I save first frame of a video as image?

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问题 I want to extract first frame of uploaded video and save it as image file. Possible video formats are mpeg, avi and wmv. One more thing to consider is that we are creating an ASP.NET website. 回答1: You could use FFMPEG as a separate process (simplest way) and let it decode first IDR for you. Here you have a class FFMPEG that has GetThumbnail() method, to it you pass address of video file, address of the JPEG image to be made, and resolution that you want the image to be: using System