ffmpeg -i input_file -f rawvideo -c:v copy output_file.dv
This script will take a video that is encoded in the DV Codec but wrapped in a different container (such as MOV) and rewrap it into a raw DV file (with the .dv extension). Since DV files potentially contain a great deal of provenance metadata within the DV stream, it is necessary to rewrap files in this method to avoid unintentional stripping of this metadata.
+This script will take a video that is encoded in the DV Codec but wrapped in a different container (such as MOV) and rewrap it into a raw DV file (with the .dv extension). Since DV files potentially contain a great deal of provenance metadata within the DV stream, it is necessary to rewrap files in this method to avoid unintentional stripping of this metadata.
You can speed up or slow down a file using the fps and atempo filters (see also the Modify speed command).
Here's an example of the full command, in which input_1 is 30fps, input_2 is 25fps, and 25fps is the desired output speed.
ffmpeg -i input_1.avi -i input_2.mp4 -filter_complex "[0:v:0] fps=fps=25 [video_to_25fps]; [0:a:0] atempo=(25/30) [audio_to_25fps]; [video_to_25fps] [audio_to_25fps] [1:v:0] [1:a:0] concat=n=2:v=1:a=1 [video_out] [audio_out]" -map "[video_out]" -map "[audio_out]" output_file
Note that the fps filter will drop or repeat frames as necessary in order to achieve the desired frame rate - see the FFmpeg fps docs for more details.
Note that the fps filter will drop or repeat frames as necessary in order to achieve the desired frame rate - see the FFmpeg fps docs for more details.
For more information, see the FFmpeg wiki page on concatenating files of different types.
Simulates Conway's Game of Life
+Simulates Conway's Game of Life
ffplay -f lavfi life=s=300x200:mold=10:r=60:ratio=0.1:death_color=#C83232:life_color=#00ff00,scale=1200:800
ImageMagick is a free and open-source software suite for displaying, converting, and editing raster image and vector image files.
-It's official website can be found here.
-Another great resource with lots of supplemental explanations of filters is available at Fred's ImageMagick Scripts.
+It's official website can be found here.
+Another great resource with lots of supplemental explanations of filters is available at Fred's ImageMagick Scripts.
Unlike many other command line tools, ImageMagick isn't summoned by calling its name. Rather, ImageMagick installs links to several more specific commands: convert, montage, and mogrify, to name a few.
Compares two images to each other.