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Editorial Team
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Asked: 2026-06-13T18:01:17+00:00

I am capturing frames from camera and rendering them in real time via OpenGL

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I am capturing frames from camera and rendering them in real time via OpenGL ES 2.0. Now I want to record them to a movie file along with audio. On iPhone, I had AVAssetWriter that would take care of the recording, giving me 30fps. What are my options on android? I tried search but couldn’t find any.

UPDATE: For those wondering what I am trying to do, see this app: https://play.google.com/store/apps/details?id=com.androidillusion.videocamillusion&hl=en

This is the only app i found that could perform 30FPS video rendering/recording. My goal is to try to figure out how it is done.

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  1. Editorial Team

    Once you capture frames from camera and render them with OpenGL i assume that you already have those frames in your memory and you don’t need to use OpenGL to read-back the rendered images.

    You can use FFmpeg or libtheora libraries to interleave your audio/video streams into a file. Both can be compiled for Android and are NDK-friendly.

    There are a lot of tutorials for both libraries.

    In case of Theora, you can convert you frames to YUV-color using GLES 2 shaders.

    P.S. If you need to read something back from OpenGL ES – just use glReadPixels() and proceed with these video encoding libraries.

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