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• ffmpeg video aspect ratio for new Instagram API

  3 juillet 2019, par reinierkors

  For the new Instagram API videos that are uploaded need to be :

  • Between 4:5 and 16:9 (aspect ratio range)
  • Between 0.8 and 1.78 (numeric aspect ratio range)

  So, for example, an aspect ratio written as 4:5 has a value of 4/5 = 0.8.

  Any aspect ratio within is fine. How could I make it so that ffmpeg checks if it’s between those ratios and if not, rescales it (using some kind of padding).

  I’ve tried :

  ffmpeg -i video.mp4 -c copy -bsf:v h264_metadata=sample_aspect_ratio=0.8 video2.mp4

  This does not seem to be doing anything.

  ffmpeg -i video.mp4 -vf "scale=w=640:h=640:force_original_aspect_ratio=decrease,pad=w=640:h=640:x=(iw-ow)/2:y=(ih-oh/2):color=white" video2.mp4

  This only scales to 640x640 and adds white padding.

  Any ideas ? Thanks !

• FFmpeg : Reuse value of a filter parameter for another one

  23 mars 2023, par Raphaël Goisque

  I have this command which draws a text ('First line Second line') on two different lines. Each text has a box drawn around it but they are not the same dimension as the size of the texts differs.

  


  As I want a unique box englobing the two lines, I thought of using the drawbox filter. The problem is that I need to know the values of the x parameter of the drawtext filters (i.e x=(main_w-text_w)/2) in order to set the x of the drawbox filter accordingly... but these value uses the variable text_w which is obviously not available from the drawbox filter.

  


  So does someone know if we can access the value of a parameter previously set ; or maybe create custom variables that we could reuse elsewhere in the command ?

  


  ffmpeg -y -i video.mp4 -vf /
"drawtext=box=1:boxcolor=white:fontcolor=black: /
text='First line':fontsize=55: /
x=(main_w-text_w)/2:y=main_h*1/6, /
drawtext=box=1:boxcolor=white:fontcolor=black: /
text='Second line':fontsize=55: /
x=(main_w-text_w)/2:y=main_h*1/6+57, /
drawbox=color=white" title.mp4


  


• ffmpeg add overlay image to command with already drawtext

  29 octobre 2020, par fedep11

  I have two ffmpeg commands I would like to add an overlay image to both :

  


  ffmpeg -i "video.mp4" -filter_complex "drawtext=textfile=sub.txt:fontfile=SourceSansPro-Bold.ttf:fontcolor=white:fontsize=100: box=1: boxcolor=black@0.5: boxborderw=5: x=200:y=h-th-200:enable='between(t,1,9)',fade=t=in:start_time=1:d=1:alpha=1,fade=t=out:start_time=8:d=1:alpha=1[fg];[0][fg]overlay=format=auto,format=yuv420p" -an -vcodec libx264 -r 25 -crf 17 -aspect 16/9 out.mp4

ffmpeg -i "video.mp4" -filter_complex "color=black@0:100x100,format=yuva444p[c]; [c][0]scale2ref[ct][mv0];[ct]setsar=1,split=4[t1][t2][t3][t4];[t1]drawtext=textfile=1.txt:fontfile=SourceSansPro-Bold.ttf:fontsize=100:fontcolor=white: box=1: boxcolor=black@0.5: boxborderw=5: x=200:y=h-th-200,fade=t=in:st=1:d=1:alpha=1,fade=t=out:st=7:d=1:alpha=1[txta1];[t2]drawtext=textfile=2.txt:fontfile=SourceSansPro-Bold.ttf:fontsize=100:fontcolor=white: box=1: boxcolor=black@0.5: boxborderw=5: x=200:y=h-th-200,fade=t=in:st=9:d=1:alpha=1,fade=t=out:st=15:d=1:alpha=1[txta2];[t3]drawtext=textfile=3.txt:fontfile=SourceSansPro-Bold.ttf:fontsize=100:fontcolor=white: box=1: boxcolor=black@0.5: boxborderw=5: x=200:y=h-th-200,fade=t=in:st=17:d=1:alpha=1,fade=t=out:st=24:d=1:alpha=1[txta3];[t4]drawtext=textfile=4.txt:fontfile=SourceSansPro-Bold.ttf:fontsize=100:fontcolor=white: box=1: boxcolor=black@0.5: boxborderw=5: x=200:y=h-th-200,fade=t=in:st=26:d=1:alpha=1,fade=t=out:st=28:d=1:alpha=1[txta4];[mv0][txta1]overlay=x='0':y='0':shortest=1[mv1];[mv1][txta2]overlay=x='0':y='0':shortest=1[mv2];[mv2][txta3]overlay=x='0':y='0':shortest=1[mv3];[mv3][txta4]overlay=x='0':y='0':shortest=1" -an -vcodec libx264 -r 25 -crf 17 -aspect 16/9 out.mp4