Sp.run('ffmpeg -y -f lavfi -i testsrc=size=1920x1080:rate=1 -vf hue=s=0 -vcodec libx264 -preset superfast -tune zerolatency -pix_fmt yuv420p -t 1000 -movflags +faststart vid.mp4') # Use superfast preset and tune zerolatency for all frames to be key frames (not a must) # Place the moov atom at the beginning of the file: Here is the Python code: import subprocess as sp Pad file with zeros at the end to make file size exactly 50 MB. You may use Python subprocess module: sp.run('ffmpeg -y -f lavfi -i testsrc=size=1920x1080:rate=1 -vf hue=s=0 -vcodec libx264 -preset superfast -tune zerolatency -pix_fmt yuv420p -t 1000 -movflags +faststart vid.mp4') ![]() ![]() Generate synthetic (gray) video using FFmpeg: ffmpeg -y -f lavfi -i testsrc=size=1920x1080:rate=1 -vf hue=s=0 -vcodec libx264 -preset superfast -tune zerolatency -pix_fmt yuv420p -t 1000 -movflags +faststart vid.mp4 The key is to place the "moov atom" at the begging of the file. You may create a shorter file and add zero padding to the end of the file.
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