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• Two versions of same static libraries conflict at run time

  2 décembre 2016, par shahid

  I am using ffmpeg 3.2 static libs (compiled for ios) In the same project i have used mobilevlckit, which is using ffmpeg 2.0.2 static libs, compiled for ios but with different configuration. Both of them work well im separate projects. But putting them together causes crashes as name of the static libraries are same and they import each other and pickup the wrong versions. Does anyone know how to fix it?

  Thanks!

• ffmpeg create blank screen with text video

  2 décembre 2016, par kalafun

  I would like to create a video consisting of some text. The video will only be 0.5 seconds long. The background should just be some colour, I am able to create such video from a photo, but cant find anywhere how this could be done without a photo, just using text to create such video.

  Can you help me ? Thanks in advance

• CLI for ffmpeg and multiple GPU card

  1er décembre 2016, par user2006056

  I have multiple GPU video card, how do I tell ffmpeg to use certain video card for video compression. Right now I type in ffmpeg -i infile.mp4 -c:v libx264 -x264opts opencl, does ffmpeg allocate the first device that support opencl?

• Combining audio and video in C# [on hold]

  1er décembre 2016, par Jay Malhotra

  Disclaimer: I know this question has already been asked but it is library-based and most of the answers I can see are 5+ years old or more, and usually refer to similarly old libraries.

  Basically, I have a video from youtube-dl (the library) and a video with audio on it (I would also like to know if there's a way to just download the audio from a video using youtube-dl or another library).

  Anyway, I want to replace the audio of the video with the audio from the second video. Apparently this can be done with ffmpeg commands but I want to use NuGet because I'm at school and I don't have the ability to install traditional software.

  Is there a library that can help me do this?

• Quicky output selection of video frames using ffmpeg

  1er décembre 2016, par Shaun

  I would like to extract, say, 10 video frames from a given video file using ffmpeg, ideally uniformly distributed throughout the video. I know this can be done in a few ways, for example

  ffmpeg -i input.mp4 -vf fps=1/10 out%03d.jpg
  

  will output one image every 10 seconds. However, this is too slow for my liking and scales proportionally with the length of the video. I have read a bit about ffmpeg's seeking capability, for example

  ffmpeg -ss 00:00:05 -i input.mp4 -frames:v 1 out001.jpg
  

  will very quickly seek to the 5th second of the video and extract one frame. However I haven't come across a way to seek to multiple locations in the video without calling the above command repeatedly at various times.

  Is there a quicker way of accomplishing this?