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• ffmpeg perspective filter animation error

  17 mars 2021, par eeun

  I'm trying to create a pseudo-3d pan effect in ffmpeg using the perspective filter.

  


  Here is a sample for the starting point...

  


  ffmpeg -y -filter-complex "color=black:s=1600x900,trim=0:5,drawgrid=width=100:height=100:thickness=2:color=white,perspective=x0=200:y0=200:x1=1600:y1=0:x2=200:y2=700:x3=1600:y3=900[skew]" -an -map [skew] "skew-start.mp4"


  


  And here is a sample for the end point...

  


  ffmpeg -y -filter-complex "color=black:s=1600x900,trim=0:5,drawgrid=width=100:height=100:thickness=2:color=white,perspective=x0=0:y0=0:x1=1600:y1=0:x2=0:y2=900:x3=1600:y3=900[skew]" -an -map [skew] "skew-end.mp4"


  


  So far so good. Adding the animation would give this...

  


  ffmpeg -y -filter-complex "color=black:s=1600x900,trim=0:5,drawgrid=width=100:height=100:thickness=2:color=white,perspective=eval=frame:x0='200-(200*t/5)':y0='200-(200*t/5)':x1=1600:y1=0:x2='200-(200*t/5)':y2='700+(200*t/5)':x3=1600:y3=900[skew]" -an -map [skew] skew.mp4


  


  This is where the problem occurs. I get an error saying [Eval @ 000000f36ebfebf0] Undefined constant or missing '(' in 't/5)' Error while filtering: Invalid argument

  


  The perspective docs say it should work with an eval=frame option. Anyone got any ideas ? Does this look like a bug in ffmpeg ? I'm using the latest version, 4.3.2.

  


• FFMpeg : Convert image + audio to MP4 60FPS including FadeIn / FadeOut and overlay

  6 juillet 2022, par Dev01

  Here is what I'm trying to achieve :

  


  

  1. Inputs are an MP3 or WAV, and an image (JPG or PNG)

  


  2. The output should be an MP4 video with the MP3 audio with the image, at 60FPS for a very smooth fade in/fade out (black) on the video (1s each)

  


  


  I strugguling to make this fade in / fade out.
Here is what I have :

  


   ffmpeg -r 1 -loop 1 -i image.jpg -i audio.mp3 -acodec copy -r 60 -shortest -vf fade=in:0:01 -pix_fmt yuv420p output.mp4


  


  My fadein is static, so black image and then my video, not smooth.
How do I get a smooth 60FPS fade ?

  


  I also have another request, let's say I have an overlay video that I want to concatenate to my video. If I concatenate a video to the existing video, the overlay will also be on top of the fades which is not right, how can I achieve this ? Thank you so much.

  


• Creating video from audio and resized image using FFMPEG

  26 septembre 2018, par nemeskeriors

  Im trying to create an mp4 video from an mp3 and an image with ffmpeg. The video should be the size of 640x360 with black background and the image should be resized to fit in this dimensions and centred in the middle. The video’s length must match the mp3’s length.

  Its basically a video creation for youtube from a song and an artwork.

  For now i was able to achieve this with 3 steps :

  1. resize image :

  -i %image% -vf scale='if(gt(a,4/3),640,-1)':'if(gt(a,4/3),-1,360)' %resized_image%

  2. create a music video with black background :

  -f lavfi -i color=s=640x360 -i %audio_file% -c:v libx264 -s:v 640x360 -c:a aac -strict experimental -b:a 320k -shortest -pix_fmt yuv420p %video%

  3. put the resized image centred in the video :

  -i %video% -i %resized_image% -filter_complex "overlay=(W-w)/2:(H-h)/2" -codec:a copy %final_video%

  Is it possible to achieve all this with one ffmpeg command ?