CODEWITHSUNDEEP
c++videoffmpegvideo-capture
Ben
Ben

Reputation: 2942

Programmatically capturing video with the FFmpeg libaries (not the libav fork) with variable frame rate in c++

I am working on a simulator in c++ and OpenGL and I wanted to add some video capture capabilities (cross platform would be a requirement here). I decided to work with FFmpeg since I can directly put my rendered frames into a video. So far so good, but in a 3D rendering engine you are usually far from having a constant frame rate and I think that it is not a good idea to go constant there. Therefore I am trying to figure out how to capture a variable frame rate video with FFmpeg or how to get from my variable frame rate of the simulator to a constant frame rate for the video in FFmpeg. Can anybody help me out here? How are videos usually captured in variable frame rate environments?

Upvotes: 0

Views: 990

Answers (1)

Ronald S. Bultje
Ronald S. Bultje

Reputation: 11174

Variable frame rate is mostly an issue in the muxing stage, since your container (e.g. good ol' AVI) might not support VFR. As long as you're muxing into a format that supports per-frame timestamps, you should be OK. Good examples of this are mkv (matroska) or mp4. Then, as long as the AVPacket.dts is set correctly during encoding/muxing, you should be fine and your video should be VFR.

Upvotes: 3

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