CODEWITHSUNDEEP
c++qtffmpeg
user1496491
user1496491

Reputation: 583

How to access framebuffer with FFMPEG?

I'm writing an application which need to capture screen. I've looked up for solution and internet says that FFMPEG could do it. But I can't find the way to do that IN CODE. FFMPEG documentation seems to be very poor.

Can anybody please tell me how do I access framebuffer raw data with FFMPEG?

Upvotes: 0

Views: 2672

Answers (1)

Petar Petrov
Petar Petrov

Reputation: 752

FFmpeg supports input of rawframes throught stdin:

With the arg -f rawvideo ffmpeg will expect frames coming from stdin

ffmpeg -r 60 -f rawvideo -pix_fmt uyvy422 -s 1280x720 -i - -threads 0 -preset fast -y -pix_fmt yuv420p output.mp4

You can check this link, it has useful information.

In Qt, you would run a QProcess with ffmpeg with -f rawvideo and write to stdin with write() method.

This is roughly how to acomplish it:

QProcess* process;

process->start("ffmpeg.exe", args, QProcess::Unbuffered | QProcess::ReadWrite);
process->waitForStarted();

  ...

process->setProcessChannelMode(QProcess::ForwardedChannels);
videoFrame->GetBytes(&buffer);
process->write(buffer);

Upvotes: 1

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