![]() ![]() Note that the "scale=640:360" filter works for both upscaling and downscaling. Multiple filters are separated by a comma. ![]() The quotation marks allow to insert a space between the filters for readability. The quotation marks are not mandatory for these video filters, yet we advice to put multiple filters into quotation marks. We advise to avoid the alias -vfilter and its abbreviation -vf as well. The video filter is specified by -filter:v. Note that downscaling – including from HD to SD – does never increase the quality of the image. HD video has 1920 x 1080 pixels and 640 x 360 pixel is the maximal size in 16:9 aspect ratio fitting into the 640 x 480 pixels of SD 1. c:a copy \ output_file Command syntax ffmpeg starts the command -i input_file path, name and extension of the input file -filter:v "scale=640:360:flags=lanczos, pad=640:480:0:60" video scaling and padding -c:a copy re-encodes using the same audio codec output_file path, name and extension of the output file Discussion Downscale and letter-box a HD video file into a SD video file. ![]()
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