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• Video Editing with Python : other transitions than crossfade

  11 février 2018, par Jay D.

  I am trying to make various transitions effects for a video-editing python script.

  Moviepy allows me to do crossfades and fades to black, but I would like a bit more diversity to transitions.

  I was thinking about : wipes, blurry wipes, blurs to black and crossblurs. All quite simple transisions types that you can find in basic video editing softwares like Windows Movie Maker.

  Examples of these transitions can be found at :
  https://www.dailymotion.com/video/x6ekx70

  Do you know any solutions ?

  Current research :

  I looked at ffmpeg but I didn t saw a single tutorial online for transitions other than crossfades & fades to black.

  The closest thing I found to my search is MLT Multimedia Framework with "Luma" patterns, working example at : https://youtu.be/t1KV6gy92i0?t=28s

  MLT has python bidings : https://github.com/mltframework/mlt/tree/master/src/swig/python

  But I have absolutely no idea how to implement those "Luma" patterns transitions in a python script.

• ffmpeg Fade-in stuck at first frame

  14 janvier 2017, par Pradeep Varadharajan

  I am trying to apply a fade-in effect at the start of a video and a fade-out effect at the end of a video.

  The fade-out effect works as I expect. However the fade-in doesn’t. I am noticing that at the starting, when the video is supposed to be black before fading in, the initial frame shows up vaguely and is stuck till the fade duration ends. The Audio fade-in seems to work correctly however.

  ffmpeg -i infile.mp4 -strict experimental -y -vf "fade=t=out:st=28:d=2, fade=t=in:st=2:d=2" -af "afade=t=out:st=28:d=2, afade=t=in:st=2:d=2" fade_in.mp4

  Can someone please help me understand what I am doing wrong here ?

  According to ffmpeg documentation for this filter, the below example is supposed to make the first 5.5 seconds black, then fade in for 0.5 seconds :

  fade=t=in:st=5.5:d=0.5

• FFMPEG : Creating video using drawtext along with word wrap and padding

  11 octobre 2022, par Chaitanya Sai

  I'm working to create a video from text with drawtext filter. Output video i can see the text is overflowing instead of coming in new line.

  



  Is there any way i can archive word wrapping and also set the internal padding to video ?

  



  Below is the snippet I'm using to generate video from text

  



  ffmpeg.exe -f lavfi -i color=c=white:s=640x480:d=5.396 -vf "[in] drawtext=fontfile=font.ttf:fontsize=20:fontcolor=black:x=0+0*print(tw):y=0+0*print(th):text='this is new whiteboard te':enable='between(t,6.634,6.818)',drawtext=fontfile=font.ttf:fontsize=20:fontcolor=black:x=0+0*print(tw):y=0+0*print(th):text='this is new whiteboard testing':enable='between(t,0.0,2.032)',drawtext=fontfile=font.ttf:fontsize=20:fontcolor=black:x=0+0*print(tw):y=0+0*print(th):text='this is new whiteboard testing no padding and the text is overflowing from the video frame check this  need to acheve word wrapping':enable='between(t,2.032,5.396)'"[out] -c:v libx264 -t 30 -crf 30 ../output.mp4


  



  Output looks like this