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I am not familiar with the use of MP4Box but I can explain a little of what is going on behind the scenes. In order to decode video, you first need an entry point, a picture to reference if you will. This reference picture is built by Intra-referencing so it is independent of the other frames. Other frames will reference this frame and other previously ...


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Thank you @LordNeckbeard for the solution. It seems ffmpeg encodes x264 way better using -crf instead of -v:b. So -crf 26 worked perfectly to eliminate the blockiness at the beginning of the video encoding process. My final code is now: ffmpeg.exe -i test.mp4 -i watermark.png -filter_complex overlay="(main_w)-(overlay_w):(main_h)-(overlay_h)" -c:v libx264 ...


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Fill disclosure: VidCoder author here. An alternative might be to use the latest VidCoder beta, which uses the HandBrake engine and has in-GUI support for rotation and reflection (with previews):



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