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Recreating Valve Video Recording on the Steam Deck
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| import gi | |
| gi.require_version('Gst', '1.0') | |
| from gi.repository import Gst, GLib | |
| class VideoProcessor: | |
| def __init__(self): | |
| Gst.init(None) | |
| self.pipeline = Gst.Pipeline.new("video_processing_pipeline") | |
| self.setup_pipeline() | |
| def setup_pipeline(self): | |
| # Create elements | |
| self.src = Gst.ElementFactory.make("pipewiresrc", "source") | |
| self.postproc = Gst.ElementFactory.make("vaapipostproc", "postproc") | |
| self.queue = Gst.ElementFactory.make("queue", "queue") | |
| self.encoder = Gst.ElementFactory.make("vaapih264enc", "encoder") | |
| self.parser = Gst.ElementFactory.make("h264parse", "parser") | |
| self.sink = Gst.ElementFactory.make("appsink", "sink") | |
| # Set properties | |
| self.src.set_property("do-timestamp", True) | |
| self.sink.set_property("emit-signals", True) | |
| self.sink.connect("new-sample", self.on_new_sample) | |
| # Add elements to pipeline | |
| elements = [self.src, self.postproc, self.queue, self.encoder, self.parser, self.sink] | |
| for element in elements: | |
| self.pipeline.add(element) | |
| # Link elements | |
| self.src.link(self.postproc) | |
| self.postproc.link(self.queue) | |
| self.queue.link(self.encoder) | |
| self.encoder.link(self.parser) | |
| self.parser.link(self.sink) | |
| def on_new_sample(self, sink): | |
| sample = sink.emit("pull-sample") | |
| if sample: | |
| buffer = sample.get_buffer() | |
| caps = sample.get_caps() | |
| # Process the buffer here | |
| self.process_frame(buffer, caps) | |
| return Gst.FlowReturn.OK | |
| def process_frame(self, buffer, caps): | |
| # This is where you can access and process the encoded frame | |
| # For example, you can get the data and size of the buffer: | |
| success, map_info = buffer.map(Gst.MapFlags.READ) | |
| if success: | |
| data = map_info.data | |
| size = map_info.size | |
| print(f"Received encoded frame: {size} bytes") | |
| # Do something with the data here | |
| buffer.unmap(map_info) | |
| def start(self): | |
| self.pipeline.set_state(Gst.State.PLAYING) | |
| self.loop = GLib.MainLoop() | |
| try: | |
| self.loop.run() | |
| except KeyboardInterrupt: | |
| pass | |
| finally: | |
| self.stop() | |
| def stop(self): | |
| self.pipeline.set_state(Gst.State.NULL) | |
| self.loop.quit() | |
| if __name__ == "__main__": | |
| processor = VideoProcessor() | |
| processor.start() |
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| import numpy as np | |
| import cv2 | |
| import ffmpeg | |
| import subprocess | |
| import os | |
| import time | |
| def write_video_live(output_dir, base_name='output', frame_width=640, frame_height=480, fps=60): | |
| if not os.path.exists(output_dir): | |
| os.makedirs(output_dir) | |
| output_init = os.path.join(output_dir, f'{base_name}_init.mp4') | |
| output_segment = os.path.join(output_dir, f'{base_name}_%03d.m4s') | |
| print(output_segment) | |
| process = ( | |
| ffmpeg | |
| .input('pipe:', format='rawvideo', pix_fmt='rgb24', s=f'{frame_width}x{frame_height}', framerate=fps) | |
| .output("/tmp/test.mpd", format='dash', vcodec='libx264', pix_fmt='yuv420p', seg_duration=2, reset_timestamps=1, streaming=1, | |
| video_bitrate="10000k", segment_format='m4s') | |
| .global_args('-loglevel', 'error') # Suppress ffmpeg output to stderr | |
| .overwrite_output() | |
| .run_async(pipe_stdin=True) | |
| ) | |
| for i in range(360): | |
| frame = np.zeros((frame_height, frame_width, 3), "uint8") | |
| frame[i:i+100, i:i+100, :] = 255 | |
| process.stdin.write(frame.tobytes()) | |
| time.sleep(1/60) | |
| process.stdin.close() | |
| process.wait() |
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| import gi | |
| gi.require_version('Gst', '1.0') | |
| from gi.repository import Gst, GLib | |
| import ffmpeg | |
| import os | |
| class VideoProcessor: | |
| def __init__(self, output_dir, base_name='output', fps=60): | |
| Gst.init(None) | |
| self.pipeline = Gst.Pipeline.new("video_processing_pipeline") | |
| self.output_dir = output_dir | |
| self.base_name = base_name | |
| self.fps = fps | |
| self.setup_pipeline() | |
| self.setup_ffmpeg() | |
| def setup_pipeline(self): | |
| # Create elements | |
| self.src = Gst.ElementFactory.make("pipewiresrc", "source") | |
| self.postproc = Gst.ElementFactory.make("vaapipostproc", "postproc") | |
| self.queue = Gst.ElementFactory.make("queue", "queue") | |
| self.encoder = Gst.ElementFactory.make("vaapih264enc", "encoder") | |
| self.parser = Gst.ElementFactory.make("h264parse", "parser") | |
| self.sink = Gst.ElementFactory.make("appsink", "sink") | |
| # Set properties | |
| self.src.set_property("do-timestamp", True) | |
| self.sink.set_property("emit-signals", True) | |
| self.sink.connect("new-sample", self.on_new_sample) | |
| # Add elements to pipeline | |
| elements = [self.src, self.postproc, self.queue, self.encoder, self.parser, self.sink] | |
| for element in elements: | |
| self.pipeline.add(element) | |
| # Link elements | |
| self.src.link(self.postproc) | |
| self.postproc.link(self.queue) | |
| self.queue.link(self.encoder) | |
| self.encoder.link(self.parser) | |
| self.parser.link(self.sink) | |
| def setup_ffmpeg(self): | |
| if not os.path.exists(self.output_dir): | |
| os.makedirs(self.output_dir) | |
| output_mpd = os.path.join(self.output_dir, f'{self.base_name}.mpd') | |
| self.ffmpeg_process = ( | |
| ffmpeg | |
| .input('pipe:', format='h264', framerate=self.fps) | |
| .output(output_mpd, format='dash', vcodec='copy', | |
| seg_duration=2, streaming=1, reset_timestamps=1, | |
| movflags='+faststart', use_template=1, use_timeline=1) | |
| .global_args('-loglevel', 'info') | |
| .overwrite_output() | |
| .run_async(pipe_stdin=True) | |
| ) | |
| def on_new_sample(self, sink): | |
| sample = sink.emit("pull-sample") | |
| if sample: | |
| buffer = sample.get_buffer() | |
| self.process_frame(buffer) | |
| return Gst.FlowReturn.OK | |
| def process_frame(self, buffer): | |
| success, map_info = buffer.map(Gst.MapFlags.READ) | |
| if success: | |
| data = map_info.data | |
| self.ffmpeg_process.stdin.write(data) | |
| buffer.unmap(map_info) | |
| def start(self): | |
| self.pipeline.set_state(Gst.State.PLAYING) | |
| self.loop = GLib.MainLoop() | |
| try: | |
| self.loop.run() | |
| except KeyboardInterrupt: | |
| pass | |
| finally: | |
| self.stop() | |
| def stop(self): | |
| self.pipeline.set_state(Gst.State.NULL) | |
| self.loop.quit() | |
| if self.ffmpeg_process: | |
| self.ffmpeg_process.stdin.close() | |
| self.ffmpeg_process.wait() | |
| if __name__ == "__main__": | |
| output_dir = "/tmp/test" | |
| processor = VideoProcessor(output_dir) | |
| processor.start() |
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To use this install decky-recorder and also run
pip install ffmpeg-python --target /tmp/ffmpeg-python && rsync -rv /tmp/ffmpeg-python/ deck@steamdeck:/home/deck/ffmpeg-pythonon a host machine. Then to run doPYTHONPATH=$PYTHONPATH:/home/deck/ffmpeg-python/ GST_PLUGIN_PATH=/home/deck/homebrew/plugins/decky-recorder/bin/gstreamer-1.0/ LD_LIBRARY_PATH=/home/deck/homebrew/plugins/decky-recorder/bin/ python script.py