Ffmpeg - Revision history

Burger: /* See Also */

2026-06-06T05:44:02Z

2026-04-07T06:29:19Z

Convert Portion of Video to GIF/MP4

← Older revision		Revision as of 02:29, 7 April 2026
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	ffmpeg -i video.mp4 -ss 00:03:05 -t 00:00:05.0 output.gif		ffmpeg -i video.mp4 -ss 00:03:05 -t 00:00:05.0 output.gif
	ffmpeg -i video.mp4 -ss 00:03:05 -t 00:00:05.0 output.mp4		ffmpeg -i video.mp4 -ss 00:03:05 -t 00:00:05.0 output.mp4
			===Playback Video at 2x Speed===
			ffmpeg -i input.mp4 -vf "setpts=0.5*PTS" output.mp4
			From: https://ottverse.com/how-to-speed-up-slow-down-video-playback-using-ffmpeg/#How_to_Speed_Up_Video_with_FFmpeg

	==Lower Resolution of Video==		==Lower Resolution of Video==
	$ ffmpeg -i example.mp4 -vf scale=640:480 output.mp4		$ ffmpeg -i example.mp4 -vf scale=640:480 output.mp4

2025-10-30T06:55:02Z

Lower Resolution of Video

← Older revision		Revision as of 02:55, 30 October 2025
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	Here, the -vf option stands for video filter, and the scale=640:480 parameter tells FFmpeg to resize the video to 640 pixels wide and 480 pixels high.		Here, the -vf option stands for video filter, and the scale=640:480 parameter tells FFmpeg to resize the video to 640 pixels wide and 480 pixels high.

	We can also use -1 as a placeholder for either width or height, and FFmpeg automatically calculates the other dimension to preserve the video’s aspect ratio>		We can also use -1 as a placeholder for either width or height, and FFmpeg automatically calculates the other dimension to preserve the video’s aspect ratio.
	$ ffmpeg -i example.mp4 -vf scale=640:-1 output.mp4		$ ffmpeg -i example.mp4 -vf scale=640:-1 output.mp4

2025-10-30T06:54:47Z

Convert Portion of Video to GIF/MP4

← Older revision		Revision as of 02:54, 30 October 2025
Line 152:		Line 152:
	ffmpeg -i video.mp4 -ss 00:03:05 -t 00:00:05.0 output.gif		ffmpeg -i video.mp4 -ss 00:03:05 -t 00:00:05.0 output.gif
	ffmpeg -i video.mp4 -ss 00:03:05 -t 00:00:05.0 output.mp4		ffmpeg -i video.mp4 -ss 00:03:05 -t 00:00:05.0 output.mp4
			==Lower Resolution of Video==
			$ ffmpeg -i example.mp4 -vf scale=640:480 output.mp4
			Here, the -vf option stands for video filter, and the scale=640:480 parameter tells FFmpeg to resize the video to 640 pixels wide and 480 pixels high.

			We can also use -1 as a placeholder for either width or height, and FFmpeg automatically calculates the other dimension to preserve the video’s aspect ratio>
			$ ffmpeg -i example.mp4 -vf scale=640:-1 output.mp4

			reference: https://www.baeldung.com/linux/video-downsample-lower-resolution

	===Get Image from Network Stream and Output to Remote Framebuffer Using dd===		===Get Image from Network Stream and Output to Remote Framebuffer Using dd===

2025-10-15T23:42:47Z

Moving the Mov Atom (video metadata) to the Beginning of the Video Will Fix Some Issues With Mono Audio

← Older revision		Revision as of 19:42, 15 October 2025
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	ffmpeg -i 748604-video.mp4 -movflags faststart -c copy output.mp4		ffmpeg -i 748604-video.mp4 -movflags faststart -c copy output.mp4

			This moves the moov-atom metadata to the beginning of the file. And then it plays perfectly:
	</pre>		</pre>

2025-10-15T23:42:09Z

Moving the Mov Atom (video metadata) to the Beginning of the Video Will Fix Some Issues With Mono Audio

@@ Line 298: / Line 298: @@
 ===Moving the Mov Atom (video metadata) to the Beginning of the Video Will Fix Some Issues With Mono Audio===
 Please read the forum thread. This is a bug unique to a 1.36 release, but it is generally useful for MP4 encoding, so I thought I would include it here. Reference: https://forums.zoneminder.com/viewtopic.php?t=34111
 <pre>
 Yes, add movflags=frag_keyframe+empty_moov+faststart to options. The value here is what is used in 1.37. Although I think empty_moov might be deprecated in newer ffmpeg.

2025-10-15T23:41:21Z

Moving the Mov Atom (video metadata) to the Beginning of the Video Will Fix Some Issues With Mono Audio

← Older revision		Revision as of 19:41, 15 October 2025
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	https://forums.zoneminder.com/viewtopic.php?p=137922		https://forums.zoneminder.com/viewtopic.php?p=137922
	===Moving the Mov Atom (video metadata) to the Beginning of the Video Will Fix Some Issues With Mono Audio===		===Moving the Mov Atom (video metadata) to the Beginning of the Video Will Fix Some Issues With Mono Audio===
	~~See~~: https://forums.zoneminder.com/viewtopic.php?t=34111		Please read the forum thread. This is a bug unique to a 1.36 release, but it is generally useful for MP4 encoding, so I thought I would include it here. Reference: https://forums.zoneminder.com/viewtopic.php?t=34111
	<pre>		<pre>
	Yes, add movflags=frag_keyframe+empty_moov+faststart to options. The value here is what is used in 1.37. Although I think empty_moov might be deprecated in newer ffmpeg.		Yes, add movflags=frag_keyframe+empty_moov+faststart to options. The value here is what is used in 1.37. Although I think empty_moov might be deprecated in newer ffmpeg.

2025-10-15T23:40:29Z

Moving the Mov Atom (video metadata) to the Beginning of the Video Will Fix Some Issues

← Older revision		Revision as of 19:40, 15 October 2025
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	https://forums.zoneminder.com/viewtopic.php?p=137922		https://forums.zoneminder.com/viewtopic.php?p=137922
	===Moving the Mov Atom (video metadata) to the Beginning of the Video Will Fix Some Issues===		===Moving the Mov Atom (video metadata) to the Beginning of the Video Will Fix Some Issues With Mono Audio===
	See: https://forums.zoneminder.com/viewtopic.php?t=34111		See: https://forums.zoneminder.com/viewtopic.php?t=34111
	<pre>		<pre>

2025-10-15T23:39:10Z

Unnecessary Encoding of Joining Videos with FFmpeg

← Older revision		Revision as of 19:39, 15 October 2025
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	https://forums.zoneminder.com/viewtopic.php?p=137922		https://forums.zoneminder.com/viewtopic.php?p=137922
			===Moving the Mov Atom (video metadata) to the Beginning of the Video Will Fix Some Issues===
			See: https://forums.zoneminder.com/viewtopic.php?t=34111
			<pre>
			Yes, add movflags=frag_keyframe+empty_moov+faststart to options. The value here is what is used in 1.37. Although I think empty_moov might be deprecated in newer ffmpeg.
			The default in 1.36 is frag_keyframe+empty_moov.
			</pre>

	==See Also==		==See Also==

2025-09-15T00:08:19Z

Unnecessary Encoding of Joining Videos with FFmpeg

← Older revision		Revision as of 20:08, 14 September 2025
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	For more details, see:		For more details, see:
	https://forums.zoneminder.com/viewtopic.php?p=137923		https://forums.zoneminder.com/viewtopic.php?p=137923

	https://forums.zoneminder.com/viewtopic.php?p=137922		https://forums.zoneminder.com/viewtopic.php?p=137922

← Older revision		Revision as of 01:44, 6 June 2026
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	* https://wiki.zoneminder.com/How_to_view_the_latest_frame_of_a_camera		* https://wiki.zoneminder.com/How_to_view_the_latest_frame_of_a_camera

			* https://hackaday.com/2026/05/28/linux-fu-fake-webcams-have-many-uses/ - Useful rundown of ffmpeg and gstreamer.

			* https://hackaday.com/2026/06/03/linux-fu-fake-webcams-gui-edition/ - Continuation of previous.