问题
I'm trying to make a slideshow from some pictures along with an existing mp3 (copied). Picture dimensions differ, but I want the video output to be 16:9 aspect ratio and 3840x2160. I also want a watermark. It is important that pictures are not stretched.
I tried this code...
ffmpeg -y -framerate 1/1.5 -i "pics/%03d.jpg" -i audio.mp3 -c:v libx264 -r 24 -preset veryfast -tune stillimage -c:a copy -pix_fmt yuv420p -aspect 16:9 -filter_complex "scale=iw*min(3840/iw\,2160/ih):ih*min(3840/iw\,2160/ih),pad=3840:2160:(3840-iw)/2:(2160-ih)/2, movie=watermark.png [watermark]; [in][watermark] overlay=main_w-overlay_w-10:main_h-overlay_h-10 [out]" vid.mkv
But it is giving me this error:
[AVFilterGraph @ 0x2d21480] Too many inputs specified for the "movie" filter. Error initializing complex filters. Invalid argument
I am able to successfully make a slideshow with pictures, audio, and watermark; however, I am unable to factor in the aspect ratio without having pictures getting stretched.
If it makes a difference, the output video will be uploaded to YouTube.
回答1:
You can remove the aspect flag. Since your filter output is 3840x2160, which is 16:9, you don't need it. Your scale filter works for me with images of varying ratios.
Here's a full command for you to try:
ffmpeg -y -framerate 2/3 -i "pics/%03d.jpg" -i audio.mp3 -loop 1 -i watermark.png
-filter_complex
"[0:v]scale=iw*min(3840/iw\,2160/ih):ih*min(3840/iw\,2160/ih),
pad=3840:2160:(3840-iw)/2:(2160-ih)/2[ss];
[ss][2:v] overlay=main_w-overlay_w-10:main_h-overlay_h-10:shortest=1[out]"
-map "[out]" -map 1:a
-c:v libx264 -r 24 -preset veryfast -tune stillimage -pix_fmt yuv420p
-c:a copy
vid.mkv
来源：https://stackoverflow.com/questions/34827238/ffmpeg-slideshow-audio-watermark-maintain-aspect-ratio