Create 5 second intro from image and concatenate to a video
ffmpeg -y -i 55.mp4 -loop 1 -framerate 30000/1001 -t 5 -i 55.png -t 0.5 -f lavfi -i anullsrc=channel_layout=stereo:sample_rate=44100 -filter_complex "[0:a]atempo=1.15,volume=1.6,pan=stereo|c0&lt;c0+0*c1|c1&lt;c0+0*c1,aeval=val(0)|-val(1) [amain]; [0:v]setpts=PTS/1.15,crop=iw/1.2:ih/1.2,scale=1280:720,setdar=16/9 [vmain]; [1:v]premultiply=inplace=1,scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2,setsar=1[vintro]; [vintro][2][vmain][amain]concat=n=2:v=1:a=1" -vcodec libx264 -pix_fmt yuv420p -g 60 -b:v 1400k -profile:v main -level 3.1 -acodec libmp3lame -b:a 128k -ar 44100 -metadata title="" -metadata artist="" -metadata album_artist="" -metadata album="" -metadata date="" -metadata track="" -metadata genre="" -metadata publisher="" -metadata encoded_by="" -metadata copyright="" -metadata composer="" -metadata performer="" -metadata TIT1="" -metadata TIT3="" -metadata disc="" -metadata TKEY="" -metadata TBPM="" -metadata language="eng" -metadata encoder="" -bufsize 500000k -threads 0 -preset superfast out2222.mp4



The intro needs audio to concat to the audio of 55.mp4 or else concat will fail. This example uses the anullsrc filter to generate silent audio. A short duration is declared because anullsrc duration by default is infinite. The concat filter will automatically extend this shortened duration to match its associated video segment.
The width, height, and aspect ratio of the 55.png is modified with the scale, pad, and setsar filters to match those of 55.mp4.