I have a ffmpeg command which is working fine to inject 2 image on the top left and bottom right of the video.
ffmpeg -i ori.mp4 -y -i 1.png -i 2.png -filter_complex \
"[0:v][1:v]overlay=20:20[bkg]; \
[bkg][2:v]overlay=(main_w-overlay_w)-20:(main_h-overlay_h)-20" \
-codec:v libx264 -crf 18 -preset slow -pix_fmt yuv420p \
-c:a aac -strict -2 out1.mp4
this command working fine with video that has large size like 720x480, however when the input video size is 320x240 size, it will overlay half of the video size.
1.png size is: 160x100
2.png size is: 341x44
any idea how to combine the scale2ref into above command?
been trying solution from this link so far no luck.
update 1: i found this command from here
ffmpeg -i ori.mp4 -y -i 1.png \
-filter_complex "[1:v][0:v]scale2ref=iw*0.25:-1[logo1][base]; \
[base][logo1]overlay=20:20[v]" -map [v] -map 0:a \
-codec:v libx264 -crf 18 -preset slow -pix_fmt yuv420p \
-c:a aac -strict -2 out2.mp4
that command work fine to get one image to scale.
update 2:
ffmpeg -i ori.mp4 -y -i 1.png -i 2.png \
-filter_complex "[1:v][0:v]scale2ref=iw*0.25:-1[logo1][base];\
[base][logo1]overlay=20:20[v];[2:v][0:v]scale2ref=iw*0.30:-1[logo2][base2];\
[base2][logo2]overlay=(main_w-overlay_w)-20:(main_h-overlay_h)-20[v]" \
-map [v] -map 0:a -codec:v libx264 -crf 18 -preset slow -pix_fmt yuv420p \
-c:a aac -strict -2 out4.mp4
tried above, nothing work. got error like this
Filter overlay has an unconnected output
any help would be great
答案 0 :(得分：1)
Use
ffmpeg -i ori.mp4 -y -i 1.png -i 2.png -filter_complex \
"[1:v][0:v]scale2ref=160/100*oh:ih/5[v1][bk1];[bk1][v1]overlay=20:20[bkg]; \
[2:v][bkg]scale2ref=341/44*oh:ih/11[v2][bk2];[bk2][v2]overlay=W-w-20:H-h-20" \
-c:v libx264 -crf 18 -preset slow -pix_fmt yuv420p \
-c:a aac -strict -2 out1.mp4