Ffmpeg - Revision history

Administrator: /* Mobile Device Compatiblity */

2015-02-22T21:17:50Z

Mobile Device Compatiblity

← Older revision		Revision as of 16:17, 22 February 2015
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	* the -profile:v command, and the accompanying -level command, ensure compatibility with iPhone/iPad. Different profiles and levels, as detailed [https://trac.ffmpeg.org/wiki/Encode/H.264 here], can be used which result in varying levels of compatibility and video compression quality.		* the -profile:v command, and the accompanying -level command, ensure compatibility with iPhone/iPad. Different profiles and levels, as detailed [https://trac.ffmpeg.org/wiki/Encode/H.264 here], can be used which result in varying levels of compatibility and video compression quality.
	* -pix_fmt yuv420p must be used to ensure that FFmpeg uses a correct color formatting for these devices (''this command should be researched further, esp. for how it relates to video quality'')		* -pix_fmt yuv420p must be used to ensure that FFmpeg uses a correct color formatting for these devices (''this command should be researched further, esp. for how it relates to video quality'')
	* -crf (constant rate factor) specifies the compression quality desired (i.e. how lossy your video will be). The command takes a single number between 0 and 51 as an argument, with 0 corresponding to no loss and 51 to the greatest amount of loss. The value 23 is the default, and the range 18-28 contains typical values. A value of 18 is not lossless but should be visually equivalent (or nearly equivalent) to a lossless video. Smaller numbers will result in better quality videos at the expense of larger file sizes.		* -crf (constant rate factor) specifies the compression quality desired (i.e., how lossy your video will be). The command takes a single number between 0 and 51 as an argument, with 0 corresponding to no loss and 51 to the greatest amount of loss. The value 23 is the default, and the range 18-28 contains typical values. A value of 18 is not lossless but should be visually equivalent (or nearly equivalent) to a lossless video. Smaller numbers will result in better quality videos at the expense of larger file sizes.
	* -r controls the framerate of the video (frames/second)		* -r controls the framerate of the video (frames/second)

Administrator at 21:17, 22 February 2015

2015-02-22T21:17:33Z

← Older revision		Revision as of 16:17, 22 February 2015
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	= Links =		= Links =
	*[http://ffmpeg.org/ FFmpeg Main Webpage]		*[http://ffmpeg.org/ FFmpeg Main Webpage]
	*[~~https~~://trac.ffmpeg.org/wiki FFmpeg Wiki]		*[http://trac.ffmpeg.org/wiki FFmpeg Wiki]
	*[~~https~~://trac.ffmpeg.org/wiki/Encode/H.264 Notes on encoding H.264 video for iPhone/iPad compatibility]		*[http://trac.ffmpeg.org/wiki/Encode/H.264 Notes on encoding H.264 video for iPhone/iPad compatibility]

Administrator at 21:16, 22 February 2015

2015-02-22T21:16:52Z

← Older revision		Revision as of 16:16, 22 February 2015
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	= Overview =		= Overview =
	~~Ffmpeg~~ is a powerful tool for handling multimedia files and compiling videos from the command line. It is extremely versatile and allows the user control over many aspects of the encoding process.		[http://ffmpeg.org/ FFmpeg] is a powerful tool for handling multimedia files and compiling videos from the command line. It is extremely versatile and allows the user control over many aspects of the encoding process.

	= Mobile Device Compatiblity =		= Mobile Device Compatiblity =
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	'''''Some notes on the above command:'''''		'''''Some notes on the above command:'''''
	* compiles .png files named movXXXXX.png, where XXXXX are sequentially numbered strings of 5 digits starting from 00001		* compiles .png files named movXXXXX.png, where XXXXX are sequentially numbered strings of 5 digits starting from 00001
	* the -profile:v command, and the accompanying -level command, ensure compatibility with ~~iphone~~/~~ipad~~. Different profiles and levels, as detailed [https://trac.ffmpeg.org/wiki/Encode/H.264 here], can be used which result in varying levels of compatibility and video compression quality.		* the -profile:v command, and the accompanying -level command, ensure compatibility with iPhone/iPad. Different profiles and levels, as detailed [https://trac.ffmpeg.org/wiki/Encode/H.264 here], can be used which result in varying levels of compatibility and video compression quality.
	* -pix_fmt yuv420p must be used to ensure that ~~ffmpeg~~ uses a correct color formatting for these devices (''this command should be researched further, esp. for how it relates to video quality'')		* -pix_fmt yuv420p must be used to ensure that FFmpeg uses a correct color formatting for these devices (''this command should be researched further, esp. for how it relates to video quality'')
	* -crf (constant rate factor) specifies the compression quality desired (i.e. how lossy your video will be). The command takes a single number between 0 and 51 as an argument, with 0 corresponding to no loss and 51 to the greatest amount of loss. The value 23 is the default, and the range 18-28 contains typical values. A value of 18 is not lossless but should be visually equivalent (or nearly equivalent) to a lossless video. Smaller numbers will result in better quality videos at the expense of larger file sizes.		* -crf (constant rate factor) specifies the compression quality desired (i.e. how lossy your video will be). The command takes a single number between 0 and 51 as an argument, with 0 corresponding to no loss and 51 to the greatest amount of loss. The value 23 is the default, and the range 18-28 contains typical values. A value of 18 is not lossless but should be visually equivalent (or nearly equivalent) to a lossless video. Smaller numbers will result in better quality videos at the expense of larger file sizes.
	* -r controls the framerate of the video (frames/second)		* -r controls the framerate of the video (frames/second)

	= Links =		= Links =
	*[http://ffmpeg.org/ ~~ffmpeg~~ Main Webpage]		*[http://ffmpeg.org/ FFmpeg Main Webpage]
	*[https://trac.ffmpeg.org/wiki ~~ffmpeg~~ Wiki]		*[https://trac.ffmpeg.org/wiki FFmpeg Wiki]
	*[https://trac.ffmpeg.org/wiki/Encode/H.264 Notes on encoding H.264 video for ~~iphone~~/~~ipad~~ compatibility]		*[https://trac.ffmpeg.org/wiki/Encode/H.264 Notes on encoding H.264 video for iPhone/iPad compatibility]

Homa at 18:04, 21 February 2015

2015-02-21T18:04:56Z

← Older revision		Revision as of 13:04, 21 February 2015
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	= Overview =		= Overview =
	Ffmpeg is a powerful tool for handling multimedia files and compiling videos from the command line. It is extremely versatile and allows the user ~~the~~ ~~freedom~~ to ~~control~~ ~~every~~ ~~aspect of~~ encoding ~~a video~~.		Ffmpeg is a powerful tool for handling multimedia files and compiling videos from the command line. It is extremely versatile and allows the user control over many aspects of the encoding process.

			= Mobile Device Compatiblity =
			Media is digested increasingly through mobile phones and tablet devices. Therefore, it is important to be aware of possible compatibility issues when encoding videos for these devices.
			Here is a command that compiles a series of .png images into a .mp4 video that is compatible with Android and Apple devices (see links at the bottom for more detailed information).

			<code>
			ffmpeg -i mov%5d.png -vcodec libx264 -profile:v baseline -level 3.1 -pix_fmt yuv420p -crf 20 -g 250 -r 20 output.mp4
			</code>

			'''''Some notes on the above command:'''''
			* compiles .png files named movXXXXX.png, where XXXXX are sequentially numbered strings of 5 digits starting from 00001
			* the -profile:v command, and the accompanying -level command, ensure compatibility with iphone/ipad. Different profiles and levels, as detailed [https://trac.ffmpeg.org/wiki/Encode/H.264 here], can be used which result in varying levels of compatibility and video compression quality.
			* -pix_fmt yuv420p must be used to ensure that ffmpeg uses a correct color formatting for these devices (''this command should be researched further, esp. for how it relates to video quality'')
			* -crf (constant rate factor) specifies the compression quality desired (i.e. how lossy your video will be). The command takes a single number between 0 and 51 as an argument, with 0 corresponding to no loss and 51 to the greatest amount of loss. The value 23 is the default, and the range 18-28 contains typical values. A value of 18 is not lossless but should be visually equivalent (or nearly equivalent) to a lossless video. Smaller numbers will result in better quality videos at the expense of larger file sizes.
			* -r controls the framerate of the video (frames/second)

	= Links =		= Links =
	[http://ffmpeg.org/ ffmpeg Main Webpage]		*[http://ffmpeg.org/ ffmpeg Main Webpage]
	[https://trac.ffmpeg.org/wiki ffmpeg Wiki]		*[https://trac.ffmpeg.org/wiki ffmpeg Wiki]
	[https://trac.ffmpeg.org/wiki/Encode/H.264 Notes on encoding H.264 video for iphone/ipad compatibility]		*[https://trac.ffmpeg.org/wiki/Encode/H.264 Notes on encoding H.264 video for iphone/ipad compatibility]

Homa at 17:39, 21 February 2015

2015-02-21T17:39:27Z

← Older revision		Revision as of 12:39, 21 February 2015
Line 1:		Line 1:
	= Overview =		= Overview =
	Ffmpeg is a powerful tool for handling multimedia files and compiling videos from the command line.		Ffmpeg is a powerful tool for handling multimedia files and compiling videos from the command line. It is extremely versatile and allows the user the freedom to control every aspect of encoding a video.

			= Links =
			[http://ffmpeg.org/ ffmpeg Main Webpage]
			[https://trac.ffmpeg.org/wiki ffmpeg Wiki]
			[https://trac.ffmpeg.org/wiki/Encode/H.264 Notes on encoding H.264 video for iphone/ipad compatibility]

Homa: Created page with "= Overview = Ffmpeg is a powerful tool for handling multimedia files and compiling videos from the command line."

2015-02-21T17:31:17Z

Created page with "= Overview = Ffmpeg is a powerful tool for handling multimedia files and compiling videos from the command line."

New page

= Overview =
Ffmpeg is a powerful tool for handling multimedia files and compiling videos from the command line.