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• How to combine pictures with an audio into a video by ffmpeg ? [duplicate]

  3 septembre 2019, par Saeron Meng

  This question already has an answer here :

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  I recorded my voice for a powerpoint (or a bunch of pictures). Now I have all materials and a list of starttimes and endtimes of each picture, but I don’t know how I should use the command line to apply ffmpeg so as to combine those to a video.

  I have searched on the Internet, some of the websites tell me to create a txt file containing the starttime and endtime of each picture and use the concat option of ffmpeg. But I don’t know how to write the txt and achieve it.

  Previously, I have an xml file containing starttimes and endtimes, to indicate my pictures :

  <page title="1" height="540" width="960" starttimestamp="794.852" speedup="true" step="65535" stoptimestamp="1008.887" loc="hls/128345566_0.png"></page>
  
  <page title="2" height="540" width="960" starttimestamp="1008.887" speedup="false" step="0" stoptimestamp="1078.888" loc="hls/128345566_1.png"></page>
  
  <page title="3" height="540" width="960" starttimestamp="1078.888" speedup="false" step="0" stoptimestamp="1081.206" loc="hls/128345566_2.png"></page>

  How to write the concat list and apply ffmpeg ? (just format will be okay)

• FFMPEG - why zoompan causes stretching

  14 septembre 2020, par Sarmad S.

  I have two images as input, both are 1600x1066. I am vertically stacking them. Then I am drawing a box and vertically stacking that box under both of the image. Inside of the box I write text, then I output a video that is 1080x1920. Everything works well, until I use zoompan to zoom in on the images, I get weird behavior. basically all input images including the box stretchs (shrink) horizontally and no longer fit the entire height of the video which is 1920.

  


  The command (removed some drawtext commands from it) :

  


  -filter_complex 
"color=s=1600x1066:color=blue, drawtext=fontfile=font.otf: text='My Text':fontcolor=white: fontsize=30: x=50: y=50[box]; 
[0]scale=4000x4000,zoompan=z='min(zoom+0.0015,1.5)':x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)':d=125:s=1600x1066[z0];
[1]scale=4000x4000,zoompan=z='min(zoom+0.0015,1.5)':x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)':d=125:s=1600x1600[z1];
[z0][z1][box]vstack=inputs=3"


  


  How do I fix this ? I want to zoom in without stretching the images

  


  Before using zoompan this is how the video looks like (I want to keep it this way while zooming in the images) :


  


  After using zoompan this is how the video looks like :

  


  

  


• FFMPEG - why zoompan causes unexpected stretching ?

  14 septembre 2020, par Sarmad S.

  I have two images as input, both are 1600x1066. I am vertically stacking them. Then I am drawing a box and vertically stacking that box under both of the image. Inside of the box I write text, then I output a video that is 1080x1920. Everything works well, until I use zoompan to zoom in on the images, I get weird behavior. basically all input images including the box stretchs (shrink) vertically and no longer fit the entire height of the video which is 1920.

  


  The command (removed some drawtext commands from it) :

  


  -filter_complex 
"color=s=1600x1066:color=blue, drawtext=fontfile=font.otf: text='My Text':fontcolor=white: fontsize=30: x=50: y=50[box]; 
[0]scale=4000x4000,zoompan=z='min(zoom+0.0015,1.5)':x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)':d=125:s=1600x1066[z0];
[1]scale=4000x4000,zoompan=z='min(zoom+0.0015,1.5)':x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)':d=125:s=1600x1066[z1];
[z0][z1][box]vstack=inputs=3"


  


  How do I fix this ? I want to zoom in without stretching the images

  


  Before using zoompan this is how the video looks like (I want to keep it this way while zooming in the images) :


  


  After using zoompan this is how the video looks like :