The regex %06d matches six digits long numbers, possibly with leading zeroes. The frame rate of sound film is 24 fps (frames per second) and the default frame rate of image2 is 25 fps, therefore we have to change it. Therefore the option -f image2 must precede the image sequence given as input. The parameters witch apply to the input files must precede them.
output_file path, name and extension of the output file Discussion pix_fmt yuv420p The pixel format for “YUV” colour space with 4:2:0 chroma subsampling and planar colour alignment is chosen for best compatibility. crf constant_rate_factor A parameter of 18 means a “visually lossless” compression. preset preset_value A slower encoding preset means a better compression rate. pix_fmt yuv420p \ output_file Command syntax ffmpeg starts the command -f image2 forces the image file de-muxer for single image files -framerate frames_per_second sets the frame rate -i input_file_regex.ext path, name with regex and extension of the input files -c:v libx264 The library libx264 re-encodes the video stream using the H.264 video codec. pix_fmt yuv420p \ output_file General command ffmpeg \ Transcode an image sequence by using the H.264 codec for dissemination purposes. Image sequence into H.264 / MPEG-4 AVC Problem
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