Typically used if your viewers are watching via progressive download in a browser or similar. movflags +faststart will re-locate the moov atom from the end of the file to the beginning once encoding is finished. See the FFmpeg H.264 Video Encoding Guide for more info on these options. so moving on to compile the FFmpeg with the needed version, get the code: Code: Select all.
piDev64b: ffmpeg ffmpeg version 4.1.6-1deb10u1+rpt1. The FFmpeg ver shipped with this beta is: Code: Select all. preset and -crf control the encoding speed and output quality. following fruitoftheloom reply, I downloaded the -raspios-buster-arm64 and installed it. This is the same as using -pix_fmt yuv420p that you may see in other examples, but I prefer to use it in a filtergraph if I do any other filtering. There is a difference in the two ffprobe outputs: For the MKVToolNIX concatenated file ffprobe says 'bitrate: 3021 kb/s' and for the ffmpeg concatenated file 'bitrate: 4696 kb/s'. I added the format filter to ensure that the output uses a chroma subsampling that is compatible with non-FFmpeg based players otherwise ffmpeg, depending on many factors, attempts to minimize or avoid subsampling which is technically often desired but not for playback with dumb players. Stream 0:1: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s (default) Metadata: DURATION : 00:03:40.016000000. c:v libx264 -preset medium -crf 23 -movflags +faststart out.mp4 Use the vstack filter: ffmpeg -i dir1/%d.png -i dir2/%d.png -filter_complex \ Boring representation of overlay of two images of same width and different height
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