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  • FFMpeg - moving overlay smoothly across background - ex. on Youtube

    12 septembre 2017, par techr

    Can somebody help me out with this. I was able to create a sliding video overlay on top of a background screen and moved it from point a to point b. However, the resulting video produces choppy movement. The overlay moves step at a time instead of one continous motion. Here’s an example of the code :

    ffmpeg -y -stream_loop -1 -i b.mpg -i bg.jpg -filter_complex "
    
[0:v]scale=320:240[vid];[1][vid]overlay=x='(180+(30-180)*(t-
    
0)/60)*between(t,0,60)+(30+(290-30)*(t-60)/60)*between(t,60,120)':y='(120+
    
(120-120)*(t-0)/60)*between(t,0,60)+(120+(30-120)*(t-
    
60)/60)*between(t,60,120)'[out]" -map "[out]" -r 29.97 -aspect 4:3 -b:v 
    
4000k -minrate 4000k -maxrate 4000k -bufsize 2000k -t 64 t.mpg
    

    
Input #0, mpegvideo, from 'b.mpg':
    
Duration: 00:00:32.34, bitrate: 4000 kb/s
    
Stream #0:0: Video: mpeg2video (Main), yuv420p(tv, progressive), 720x480 
    
[SAR 32:27 DAR 16:9], 4000 kb/s, 29.97 fps, 29.97 tbr, 1200k tbn, 59.94 tbc
    
Input #1, image2, from 'bg.jpg':
    
Duration: 00:00:00.04, start: 0.000000, bitrate: 19637 kb/s
    
Stream #1:0: Video: mjpeg, yuvj444p(pc, bt470bg/unknown/unknown), 640x480, 
    
25 tbr, 25 tbn, 25 tbc
    
Stream mapping:
    
Stream #0:0 (mpeg2video) -> scale
    
Stream #1:0 (mjpeg) -> overlay:main
    
overlay -> Stream #0:0 (mpeg1video)
    
Press [q] to stop, [?] for help
    
[swscaler @ 0000000002adc740] deprecated pixel format used, make sure you 
    
did set range correctly
    
Output #0, mpeg, to 't.mpg':
    
Metadata:
    
encoder         : Lavf57.73.100
    
Stream #0:0: Video: mpeg1video, yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=2-31, 
    
4000 kb/s, 29.97 fps, 90k tbn, 29.97 tbc (default)
    
Metadata:
    
encoder         : Lavc57.99.100 mpeg1video
    
Side data:
    
cpb: bitrate max/min/avg: 4000000/4000000/4000000 buffer size: 2000000 
    
vbv_delay: -1
    
warning, clipping 1 dct coefficients to -255..255repeated 2 timesnter

    Link to video here : https://youtu.be/EE_hrjy4ilg

  • FFMpeg - Need help on moving an overlay smoothly

    14 septembre 2017, par techr

    Can somebody help me out with this. I was able to create a sliding video overlay on top of a background screen and moved it from point a to point b. However, the resulting video produces choppy movement. The overlay moves step at a time instead of one continous motion. Here’s an example of the code :

    ffmpeg -y -stream_loop -1 -i b.mpg -i bg.jpg -filter_complex "
    
[0:v]scale=320:240[vid];[1][vid]overlay=x='(180+(30-180)*(t-
    
0)/60)*between(t,0,60)+(30+(290-30)*(t-60)/60)*between(t,60,120)':y='(120+
    
(120-120)*(t-0)/60)*between(t,0,60)+(120+(30-120)*(t-
    
60)/60)*between(t,60,120)'[out]" -map "[out]" -r 29.97 -aspect 4:3 -b:v 
    
4000k -minrate 4000k -maxrate 4000k -bufsize 2000k -t 64 t.mpg
    

    
Input #0, mpegvideo, from 'b.mpg':
    
Duration: 00:00:32.34, bitrate: 4000 kb/s
    
Stream #0:0: Video: mpeg2video (Main), yuv420p(tv, progressive), 720x480 
    
[SAR 32:27 DAR 16:9], 4000 kb/s, 29.97 fps, 29.97 tbr, 1200k tbn, 59.94 tbc
    
Input #1, image2, from 'bg.jpg':
    
Duration: 00:00:00.04, start: 0.000000, bitrate: 19637 kb/s
    
Stream #1:0: Video: mjpeg, yuvj444p(pc, bt470bg/unknown/unknown), 640x480, 
    
25 tbr, 25 tbn, 25 tbc
    
Stream mapping:
    
Stream #0:0 (mpeg2video) -> scale
    
Stream #1:0 (mjpeg) -> overlay:main
    
overlay -> Stream #0:0 (mpeg1video)
    
Press [q] to stop, [?] for help
    
[swscaler @ 0000000002adc740] deprecated pixel format used, make sure you 
    
did set range correctly
    
Output #0, mpeg, to 't.mpg':
    
Metadata:
    
encoder         : Lavf57.73.100
    
Stream #0:0: Video: mpeg1video, yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=2-31, 
    
4000 kb/s, 29.97 fps, 90k tbn, 29.97 tbc (default)
    
Metadata:
    
encoder         : Lavc57.99.100 mpeg1video
    
Side data:
    
cpb: bitrate max/min/avg: 4000000/4000000/4000000 buffer size: 2000000 
    
vbv_delay: -1
    
warning, clipping 1 dct coefficients to -255..255repeated 2 timesnter

    Link to video here : https://youtu.be/EE_hrjy4ilg

  • Moving an overlay smoothly

    6 décembre 2017, par techr

    I have a sliding video overlay on top of a background screen and move it from point a to point b.

    The resulting video produces choppy movement. The overlay moves a step at a time instead of in one continous motion.

    Here’s an example of the code :

    ffmpeg -y -stream_loop -1 -i b.mpg -i bg.jpg -filter_complex "
    
[0:v]scale=320:240[vid];[1][vid]overlay=x='(180+(30-180)*(t-
    
0)/60)*between(t,0,60)+(30+(290-30)*(t-60)/60)*between(t,60,120)':y='(120+
    
(120-120)*(t-0)/60)*between(t,0,60)+(120+(30-120)*(t-
    
60)/60)*between(t,60,120)'[out]" -map "[out]" -r 29.97 -aspect 4:3 -b:v 
    
4000k -minrate 4000k -maxrate 4000k -bufsize 2000k -t 64 t.mpg
    

    
Input #0, mpegvideo, from 'b.mpg':
    
Duration: 00:00:32.34, bitrate: 4000 kb/s
    
Stream #0:0: Video: mpeg2video (Main), yuv420p(tv, progressive), 720x480 
    
[SAR 32:27 DAR 16:9], 4000 kb/s, 29.97 fps, 29.97 tbr, 1200k tbn, 59.94 tbc
    
Input #1, image2, from 'bg.jpg':
    
Duration: 00:00:00.04, start: 0.000000, bitrate: 19637 kb/s
    
Stream #1:0: Video: mjpeg, yuvj444p(pc, bt470bg/unknown/unknown), 640x480, 
    
25 tbr, 25 tbn, 25 tbc
    
Stream mapping:
    
Stream #0:0 (mpeg2video) -> scale
    
Stream #1:0 (mjpeg) -> overlay:main
    
overlay -> Stream #0:0 (mpeg1video)
    
Press [q] to stop, [?] for help
    
[swscaler @ 0000000002adc740] deprecated pixel format used, make sure you 
    
did set range correctly
    
Output #0, mpeg, to 't.mpg':
    
Metadata:
    
encoder         : Lavf57.73.100
    
Stream #0:0: Video: mpeg1video, yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=2-31, 
    
4000 kb/s, 29.97 fps, 90k tbn, 29.97 tbc (default)
    
Metadata:
    
encoder         : Lavc57.99.100 mpeg1video
    
Side data:
    
cpb: bitrate max/min/avg: 4000000/4000000/4000000 buffer size: 2000000 
    
vbv_delay: -1
    
warning, clipping 1 dct coefficients to -255..255repeated 2 timesnter

    Link to video here : https://youtu.be/EE_hrjy4ilg

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