#LINUX VIDEO EDITING SOFTWARE 2018 720P#

0x00FF00 uses the classical RRGGBB format to tell FFmpeg the color you want to use as the chroma key.Ģ. In this example, after converting the second stream ( ) to the RGBA color space, you pass two parameters to the chromakey filter:ġ. is the stream that is the result of applying the chromakey filter to.Remember that Sintel_cut_ck.mp4 is the result of overlaying the chroma key image onto the Sintel clip. is the second input stream ( Sintel_cut_ck.mp4).is the first input stream ( tears_of_steel_cut.mp4).

This makes passing the streams from one filter to the next, and finally to the output, easier and non-ambiguous. Now you can merge that clip with the Tears of Steel clip using the chroma key filter: ffmpeg -i tears_of_steel_cut.mp4 -i Sintel_cut_ck.mp4 -filter_complex ' format=rgba, chromakey=0x00FF00:0.3 overlay amix=inputs=2' Sintel_ToS_ck.mp4Īs discussed in my previous article on FFmpeg, you can label input streams and then the derivative streams. The resulting Sintel_cut_ck.mp4 clip should look like Figure 6.įigure 6: A PNG image with a green area overlaid onto the Sintel clip. Then overlay your image on the Sintel clip like this: ffmpeg -i Sintel_cut.mp4 -i mask.png -filter_complex 'overlay' Sintel_cut_ck.mp4 Create a frame-sized (1280x534) image called mask.png, which is half transparent and half green.

Now that you have your two clips, you can start experimenting with the chroma key filter.įirst try using a static PNG image with a green section. The preceding command will give you a clip that starts at the five-minute mark in the Sintel film and that lasts for one minute.ĭo the same with the Tears of Steel film. The -ss parameter tells FFmpeg the starting time from which to cut. Otherwise, every time you want to render something, you will have to render two complete films, and that takes a long time. You may also want to cut out a one-minute clip to work with: ffmpeg -i -ss 00:05:00 -t 00:01:00 Sintel_cut.mp4 If necessary, you can change your movie's SAR like this: ffmpeg -i -filter_complex 'setsar=sar=1' Before you proceed, both of your films must have the same SAR, preferably 1:1. A different SAR would define an oblong shape. The SAR tells you the shape of the pixels that make up each frame. The ffprobe tool gives you more useful information, like the Storage Aspect Ratio (SAR). You can confirm this using ffprobe with the file. Formatted for widescreens, they are actually 1280x534p.

#LINUX VIDEO EDITING SOFTWARE 2018 720P#

Note that the two films are not really 720p that is, they are not 1280 pixels wide by 720 pixels high. Both movies were produced by the Blender Foundation and are distributed under a permissive license. In the spirit of this section, you can do everything using command-line tools, including the Pacman animation – if you want to try, I used ImageMagick for everything, from the Pacman drawings to the generation of the 48 frames used in the transition.įor this exercise, you will need the 720p version of Sintel and the 720p version of Tears of Steel. Suppose I want to create a vanity transition in which an animated Pacman gobbles up one scene to reveal another one below.

That got me thinking… Remember what other video-manipulation software works with streams ? FFmpeg. Figure 5: Merging the top clip with the animation and then using a chroma key filter to merge with the bottom clip in Natron.

Linux video editing software 2018