Video Playback - Revision history

E.vandenberge: /* Video encoding */

2026-04-15T09:12:05Z

Video encoding

← Older revision		Revision as of 09:12, 15 April 2026
Line 287:		Line 287:
	Stabilize the camera and avoid automatic exposure, white balance, or focus during recording to prevent inconsistencies.		Stabilize the camera and avoid automatic exposure, white balance, or focus during recording to prevent inconsistencies.
	Record in a controlled environment with consistent lighting and minimal background distractions.		Record in a controlled environment with consistent lighting and minimal background distractions.
	The TSG recomends to use the [~~https://www.elgato.com/ww/en/p/facecam-mk2 facecam~~] for high quality video recording.		The TSG recomends to use the [[Elgato Facecam]] for high quality video recording.

	===Video Settings===		===Video Settings===

P.dewater: /* Python */

2026-01-14T14:17:01Z

Python

← Older revision		Revision as of 14:17, 14 January 2026
Line 6:		Line 6:
	Note that the Lab Computer displays are typically set to 1920×1080 at 120Hz. We found that this is sufficient for most applications. There are possibilities to go higher. Later in this wiki we will explain how to build audio and video. We will start with playing video, both with and without audio.		Note that the Lab Computer displays are typically set to 1920×1080 at 120Hz. We found that this is sufficient for most applications. There are possibilities to go higher. Later in this wiki we will explain how to build audio and video. We will start with playing video, both with and without audio.

	=== Python ===		=== Python psychopy 2024.2.4===
	Example demonstrating how to play a video with audio:		Example demonstrating how to play a video with audio:
	<syntaxhighlight lang="python" line>		<syntaxhighlight lang="python" line>

P.dewater: /* Video playback */

2026-01-14T14:12:32Z

Video playback

← Older revision		Revision as of 14:12, 14 January 2026
Line 21:		Line 21:
	win = visual.Window(size=(1024, 768), fullscr=False, color=(0, 0, 0))		win = visual.Window(size=(1024, 768), fullscr=False, color=(0, 0, 0))

	~~video~~ = visual.~~VlcMovieStim~~(		movie = visual.MovieStim(
	win, filename=video_file,		win, filename=video_file,
	autoStart= False		autoStart= False
Line 35:		Line 35:

	# Main loop for video playback		# Main loop for video playback
	while ~~video~~.~~status != visual.FINISHED~~:		while not movie.isFinished:
	# Draw the current video frame		# Draw the current video frame
	~~video~~.draw()		movie.draw()
	win.flip()		win.flip()

Line 43:		Line 43:
	if 'q' in keys:		if 'q' in keys:
	break		break
			movie.stop() # stop playback
			del movie
			gc.collect()

	win.close()		win.close()
Line 63:		Line 66:
	win = visual.Window(size=(1280, 720), fullscr=False, color=(0, 0, 0), units="pix")		win = visual.Window(size=(1280, 720), fullscr=False, color=(0, 0, 0), units="pix")

	~~video~~ = visual.~~VlcMovieStim~~(		movie = visual.MovieStim(
	win, filename=video_file,		win, filename=video_file,
	size=None, # Use the native video size		size=None, # Use the native video size
Line 85:		Line 88:
	audio.play()		audio.play()
	time.sleep(0.04)		time.sleep(0.04)
	~~video~~.play()		movie.play()
	~~video_start_time~~ = core.getTime()		movie_start_time = core.getTime()

	while ~~video~~.~~status != visual.FINISHED~~:		while not movie.isFinished:
	# Draw the current video frame		# Draw the current video frame
	~~video~~.draw()		movie.draw()
	win.flip()		win.flip()

Line 97:		Line 100:
	audio.stop()		audio.stop()
	break		break
			movie.stop() # stop playback
			del movie
			gc.collect()

	# Close the PsychoPy window		# Close the PsychoPy window

E.vandenberge: /* FFmpeg */

2025-09-15T12:49:11Z

FFmpeg

← Older revision		Revision as of 12:49, 15 September 2025
Line 485:		Line 485:

	==FFmpeg==		==FFmpeg==
			{{See also\|FFmpeg}}
	===Synchronization===		===Synchronization===
	Ensure the audio and video streams have consistent timestamps:		Ensure the audio and video streams have consistent timestamps:

P.dewater: /* Python */

2025-04-29T10:47:46Z

Python

← Older revision		Revision as of 10:47, 29 April 2025
Line 244:		Line 244:
	subprocess.run(['ffmpeg', '-i', input_file, '-an', output_video])		subprocess.run(['ffmpeg', '-i', input_file, '-an', output_video])

	subprocess.run(['ffmpeg', '-i', input_file, '-vn', '-acodec', 'pcm_s16le', '-ar', '~~44100~~', output_audio])		subprocess.run(['ffmpeg', '-i', input_file, '-vn', '-acodec', 'pcm_s16le', '-ar', '48000', output_audio])

	print(f"Video saved to: {output_video}")		print(f"Video saved to: {output_video}")

P.dewater: /* Video encoding */

2025-04-29T09:49:23Z

Video encoding

← Older revision		Revision as of 09:49, 29 April 2025
Line 281:		Line 281:
	Stabilize the camera and avoid automatic exposure, white balance, or focus during recording to prevent inconsistencies.		Stabilize the camera and avoid automatic exposure, white balance, or focus during recording to prevent inconsistencies.
	Record in a controlled environment with consistent lighting and minimal background distractions.		Record in a controlled environment with consistent lighting and minimal background distractions.
	~~You can~~ use the [https://www.elgato.com/ww/en/p/facecam-mk2 facecam] for high quality video recording.		The TSG recomends to use the [https://www.elgato.com/ww/en/p/facecam-mk2 facecam] for high quality video recording.

	===Video Settings===		===Video Settings===

P.dewater: /* Python */

2025-04-29T09:47:14Z

Python

← Older revision		Revision as of 09:47, 29 April 2025
Line 108:		Line 108:
	import json		import json

	file_path = "~~C_dyad1_video2_241123~~.mp4"		file_path = "tick_rhythm_combined_1min.mp4"

	def check_video_file(file_path):		def check_video_file(file_path):

P.dewater: /* Python */

2025-04-29T09:46:06Z

Python

← Older revision		Revision as of 09:46, 29 April 2025
Line 428:		Line 428:

	=== Python ===		=== Python ===
	Example demonstrating how to check and play your audio:		Example demonstrating how to check your os settings, audio file and play your audio:
	<syntaxhighlight lang="python" line>		<syntaxhighlight lang="python" line>
	#!/usr/bin/env python3.10		#!/usr/bin/env python3.10

P.dewater: /* Video playback */

2025-04-29T09:37:50Z

Video playback

← Older revision		Revision as of 09:37, 29 April 2025
Line 8:		Line 8:
	=== Python ===		=== Python ===
	Example demonstrating how to play a video with audio:		Example demonstrating how to play a video with audio:
	~~<div class="mw-collapsible mw-collapsed" style="width:100%">~~
	~~<div style="padding:5px">~~
	<syntaxhighlight lang="python" line>		<syntaxhighlight lang="python" line>
	from psychopy import logging, prefs		from psychopy import logging, prefs
Line 49:		Line 47:
	core.quit()		core.quit()
	</syntaxhighlight>		</syntaxhighlight>
	~~</div>~~
	~~</div>~~
	Example demonstrating how to play a video with audio disconnected:		Example demonstrating how to play a video with audio disconnected:
	<syntaxhighlight lang="python" line>		<syntaxhighlight lang="python" line>

P.dewater: /* Python */

2025-04-29T09:33:48Z

Python

← Older revision		Revision as of 09:33, 29 April 2025
Line 9:		Line 9:
	Example demonstrating how to play a video with audio:		Example demonstrating how to play a video with audio:
	<div class="mw-collapsible mw-collapsed" style="width:100%">		<div class="mw-collapsible mw-collapsed" style="width:100%">
			<div style="padding:5px">
	<syntaxhighlight lang="python" line>		<syntaxhighlight lang="python" line>
	from psychopy import logging, prefs		from psychopy import logging, prefs
Line 48:		Line 49:
	core.quit()		core.quit()
	</syntaxhighlight>		</syntaxhighlight>
			</div>
			</div>
	Example demonstrating how to play a video with audio disconnected:		Example demonstrating how to play a video with audio disconnected:
	<syntaxhighlight lang="python" line>		<syntaxhighlight lang="python" line>