![]() ![]() ![]() Here, we passed the -c copy option which causes the original audio + video streams (with their codecs) to simply be copied. I am using ffmpeg to scale video files to fit within a size of 1280:720, maintaining aspect ratio, using the below commands. ffmpeg -i inputFile.avi -c copy outputFile.mp4 / -i > Input file -c > codec to use /. If you need original audio available in the output video use -map 0:a before specifying the output file. ffmpeg -i test.avi -filter:v 'crop1280:670' outputvideo. Lets say you wish to encode an AVI into a MP4 file. loop will loop the image through out the video duration and -t will limit the duration of the output video to seconds you want. To scale the video file by times its self such as twice as large or twice as small you can use variables or / along with iw and ih to specify the input width and input height respectively. 1:v refers to the input image and it is overlay with the scaled video to the centre of the image. ![]() 0:v refers to the input video and it's width and height being scaled to be 80% of its original. Here you have to use filter_complex and map for overlaying and do the scaling, etc. One advantage of this method is the ability to set one dimension, and let ffmpeg calculate the other based on the aspect ratio. For example: ffmpeg -i input.mp4 -vf scale640:360 output.mp4. ![]() Automatic stream selection In the absence of any map options for a. There's another way to change the size of the video with ffmpeg the video filter 'scale'. ffmpeg -i input_video -loop 1 -i input_image -t video_duration -filter_complex "scale=iw*80/100:ih*80/100 overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2,setpts=PTS-STARTPTS" -c:v libx264 -map output_video It can also convert between arbitrary sample rates and resize video on the fly with a. The tasks that can be performed with the aid of ffmpeg include audio file conversion, video file conversion, photo conversion, image file. ![]()
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