Newest 'ffmpeg' Questions - Stack Overflow

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• PHP-FFMPEG How can I display the progress ?

  24 mars, par Mondi

  Formathttps://github.com/PHP-FFMpeg/PHP-FFMpeg?tab=readme-ov-file#formats

  The callback provided for the event can be any callable.

  I'm just learning and I don't understand how to make a callback. Is it possible to give an example, please?

• FFmpeg, low quality merge using overlay filter [closed]

  24 mars, par He2A

  I am currently building a script, part of its functionality is to generate a cover art. I want to limit the scripts dependency to ffmpeg only so please don't suggest to use any other software to do the same.

  For this, I am using ffmpeg to generate separate components for the coverart, code is given below:

  # Draws transparent circle in correct background
  ffmpeg -y -f lavfi -i "color=c=0x20292FFF:s=4000x4000,format=rgba" -filter_complex "geq=r='32':g='41':b='47':a='255*(1-between(hypot(X-2000,Y-2000),0,1150))'" -frames:v 1 -update 1 background.png
  
  # Draws a circle gradient
  ffmpeg -y -f lavfi -i "gradients=s=4000x4000:c0=0x33517e:c1=0x645098:c2=0xa53f97:c3=0xdf1177:c4=0xff033e:c5=0x2f4858:n=5:y0=750:x0=750:y1=3250:x1=3250:t=linear,format=rgba" -filter_complex "geq=g='g(X,Y)':a='255*between(hypot(X-2000,Y-2000),0,1200)'" -frames:v 1 -update 1 gradcir.png
  
  # Draws the inner symbol
  ffmpeg -y -f lavfi -i "color=c=0x20292FFF:s=4000x4000,format=rgba" -vf "geq=a='255*max(lte((X-2000+(530/3)+25)+sqrt(3)*abs(Y-2000),530)*gte(X-2000+(530/3)+25,0),between(hypot(X-2000,Y-2000),570,630))':r='255*max(lte((X-2000+(530/3)+25)+sqrt(3)*abs(Y-2000),530)*gte(X-2000+(530/3)+25,0),between(hypot(X-2000,Y-2000),570,630))':g='255*max(lte((X-2000+(530/3)+25)+sqrt(3)*abs(Y-2000),530)*gte(X-2000+(530/3)+25,0),between(hypot(X-2000,Y-2000),570,630))':b='255*max(lte((X-2000+(530/3)+25)+sqrt(3)*abs(Y-2000),530)*gte(X-2000+(530/3)+25,0),between(hypot(X-2000,Y-2000),570,630))'" -frames:v 1 shape.png
  

  Now to merge all three pngs, I am using the following command:

  ffmpeg -y -i background.png -i gradcir.png -i shape.png -filter_complex "[0][1]overlay[tmp];[tmp][2]overlay" cover.png
  

  All the code works but the problem is that the output is severely low quality with banding and improper merges in the borders of each image.

  I believe png is lossless so there shouldn't be any issue with artifacts but still I experimented with different levels of png compression but to no avail. I even tried enforcing rgba format for all three images prior to merging but to no avail.

  For now I alleviated the problem by generating all images in 4000x4000 resolution, applying a deband filter and then resizing it to 1000x1000.

  ffmpeg -y -i background.png -i gradcir.png -i shape.png -filter_complex "[0][1]overlay[tmp1];[tmp1][2]overlay[tmp2];[tmp2]format=rgb24,scale=2000:2000:flags=spline,deband,scale=1000:1000:flags=lanczos" -frames:v 1 -update 1 cover.png
  

  But the above method is expensive, which is problematic for low performance systems. Can anyone find out what seems to be the issue or suggest some better way to merge it?

• Requested MovieWriter (ffmpeg) not available even when I installed it

  23 mars, par EXODIA

  I am running this command.

  import bar_chart_race as bcr
  bcr.bar_chart_race(df=covid_df,filename=None,figsize=(3.5,3),title='Covid-19 Cases by State',n_bars=10)
  

  Getting the below error

  Exception: You do not have ffmpeg installed on your machine. Download
                              ffmpeg from here: https://www.ffmpeg.org/download.html.
                              
                              Matplotlib's original error message below:
  
                              Requested MovieWriter (ffmpeg) not available
  
  

  Have already installed the module

  D:\py\Scripts>pip install ffmpeg-python
  Requirement already satisfied: ffmpeg-python in d:\py\lib\site-packages (0.1)
  
  D:\py\Scripts>
  

• FFmpeg, how to output AVIF image series instead of animated AVIF ? [closed]

  23 mars, par EntityinArray

  I want to convert a series of huge PNGs into AVIF.

  ffmpeg -i 'img (%d).png' -c:v libsvtav1 -s 1280x720 .\lidl\img%d.avif
  

  FFmpeg always outputs an animated AVIF. How to force it to output AVIF image series?

• FFmpeg, output AVIF image series instead of animated AVIF

  23 mars, par EntityinArray

  I want to convert a series of huge PNGs into AVIF.

  ffmpeg -i 'img (%d).png' -c:v libsvtav1 -s 1280x720 .\lidl\img%d.avif
  

  FFmpeg always outputs an animated AVIF. How to force it to output AVIF image series?