Would it be possible to decode a file to frames and display them on the fly without holding the entire video in memory?

[Liam-00]

My goal is to effectively play a video from a file in a custom view by cycling through frames at the video framerate. My first attempt at this uses ffmpeg to decode the entire video file into a stream of PNGs (should probably use rawvideo), then splits that stream into an array of images that can be displayed.
The FFMpegCore use looks like this:

await FFMpegArguments
      .FromFileInput(videoPath)
      .OutputToPipe(new StreamPipeSink(video_outputstream), options => options
       .WithVideoCodec("png")
       .ForceFormat("image2pipe")
       .ForcePixelFormat("rgba"))
      .ProcessAsynchronously();

This is manageable for very small videos, but requires that the entire decoded video sequence be held in memory at once making memory usage a problem. So is there any way of decoding one frame to a buffer, showing that frame, then decoding the next frame into the buffer, showing that frame and so on in a loop? I've experimented briefly with using a filestream and pipe input, but that seems to get decoded all at once by FFMpegCore, so I'm not sure if there's a way to effectively "stream" a file like a videoplayer would.

[hqkirkland]

Does the -re flag accomplish at least some of what you want?

This flag should indicate to FFMPEG that the input should be read/processed at 1x of the framerate of the video, or as near to it as possible.

FFMpegArguments.FromFileInput(videoPath, inputOptions => inputOptions.WithCustomArgument(string.Format("-re")))

That said, I don't think this prevents the full file from being required to stay in memory.