FFmpeg代码无法在http url上进行缩略图提取

Question

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 not possible to use url in ffmpeg can anyone suggest another method to achieve thumbnail.(as i want the thumbnail to be set automatically using 1st frame from of video if it not set manually)

Answer 1

I tested below parameters they worked. to extract first frame from remote video.

ffmpeg -i "http://techslides.com/demos/sample-videos/small.mp4" -f image2 -vframes 1 "e:\images\01\image%03d.jpg"

to extract image from specific duration of the video (first frame maybe black) use the -ss parameter. -ss 00:00:02 means take image at 2th second. (more specific frame -ss 00:00:02.xxx xxx=0 to 999 milliseconds)

ffmpeg -ss 00:00:02 -i "http://techslides.com/demos/sample-videos/small.mp4" -f image2 -vframes 1 "e:\images\01\image%03d.jpg"

update the code How can I save first frame of a video as image? as your need.

Updates

Below commands failed with Invalid data found when processing input but you can find a solution to your question by trying -cookies or -headers parameters. When authentication is required -cookies or -headers arguments can be used as below. When you log in to server use Fiddler to get cookies and add them to ffmpeg -cookies or -headers parameters.

ffmpeg -cookies "path=/; domain=domainname.com; cookiesgoeshere\r\n" -i "video url goes here" -f image2 -vframes 1 "e:\image%03d.jpg"

or

ffmpeg -headers "Cookie: path=/; domain=domainname.com; cookiesgoeshere\r\n" -i "video url goes here" -f image2 -vframes 1 "e:\image%03d.jpg"

related topics

How to enable cookies in ffmpeg HLS - Stack Overflow

or Zeranoe FFmpeg - View topic - Custom http headers

another option is run ffmpeg in your web server