Zoom in and pan always at center

Question

Zoom in and pan always at center

trungbq06 opened this issue 6 years ago · 9 comments

trungbq06 commented 6 years ago

Hi @tanersener ,

I'm trying to use the effects described here https://ffmpeg.org/ffmpeg-filters.html#Examples-113 but it doesn't work.

I add x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)'

to file zoom_in_and_pan_with_fade_in_out_one.sh but it doesn't work. Could you please help me with this?

Answer 1 · 2019-06-21T05:14:14.000Z

Please use POSITION_NUMBER=2 on this line?

Answer 2 · 2019-06-21T05:46:46.000Z

Thank you so much for your reply,

In my case, remove POSITION_FORMULA help me get happy results.

Answer 3 · 2019-06-21T05:49:11.000Z

Great 👍

Answer 4 · 2019-06-21T07:03:44.000Z

Hi @tanersener ,

I'm trying to make another animation with zoom in and pan filter. I don't want the raw image zoomin and pan. I just want the raw image move from left to right.

I think I will need to make some animation on [stream${c}raw] from line 77 in zoom_in_and_pan_with_fade_in_out_one.sh but cannot do that.

Would you please help me out?

Answer 5 · 2019-06-21T07:51:05.000Z

# 4. PREPARE INPUTS & FADE IN/OUT PARTS section fits images to screen. If you don't apply zoom effect and move the image left/right then background color will be shown during the movement, similar to the beginning of Stack transitions. Is this what you want to implement?

Answer 6 · 2019-06-21T08:33:28.000Z

No, that's not I want to implement.

I want to pan the raw image (left to right or right to left), while still blur background.

Answer 7 · 2019-06-21T08:58:56.000Z

I changed line 67 to this:

FULL_SCRIPT+="[stream${c}blurred][stream${c}raw]overlay=x='-(overlay_w-${WIDTH})+(overlay_w-${WIDTH})*t/${IMAGE_DURATION}':y='if(gte(H,${HEIGHT}),0,overlay_h/2)',trim=duration=${IMAGE_DURATION},format=yuv420p[stream$((c+1))out];"

But the moving is too fast. How can I slow down it?

Answer 8 · 2019-06-21T09:03:03.000Z

Line 67 controls SCREEN_MODE = 1. If you want to use blurred background you need to use SCREEN_MODE = 4 and update Line 78.

(main_w-overlay_w)/2 expression of overlay filter in Line 78 defines the horizontal position (x). It is currently fixed and defines the horizontal center. You need to update it.

FULL_SCRIPT+="[stream${c}blurred][stream${c}raw]overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2:format=rgb,setpts=PTS-STARTPTS,split=2[stream$((c+1))out1][stream$((c+1))out2];"

Answer 9 · 2019-06-22T07:18:52.000Z

Thank you so much for your help.