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• ffmpeg fade in animation and logo overlay in a single step

  24 octobre 2018, par Amin Baig

  I have the following commands to create a fade in effect with a series of images and then place a water mark png using the lut filter on the generated video :

  //Creating the fade in video :

  ffmpeg -t 5 -i 1.jpg -t 5 -i 2.jpg -t 5 -i 3.jpg -t 5 -i 4.jpg -i 5.jpg -filter_complex "[0:v]zoompan=z='min(zoom+0.0015,1.5)':d=125,fade=t=out:st=4:d=1[v0];[1:v]zoompan=z='min(zoom+0.0015,1.5)':d=125,fade=t=in:st=0:d=1,fade=t=out:st=4:d=1[v1];[2:v]zoompan=z='min(zoom+0.0015,1.5)':d=125,fade=t=in:st=0:d=1,fade=t=out:st=4:d=1[v2];[3:v]zoompan=z='min(zoom+0.0015,1.5)':d=125,fade=t=in:st=0:d=1,fade=t=out:st=4:d=1[v3];[4:v]zoompan=z='min(zoom+0.0015,1.5)':d=125,fade=t=in:st=0:d=1,fade=t=out:st=4:d=1[v4];[v0][v1][v2][v3][v4]concat=n=5:v=1:a=0,format=yuva444p[v]" -map "[v]" -s "480x600" -t 40 series_out_fade_v2_5images.mp4

  After the video is created I use the following command to place a water mark logo over it :

  //Water mark

  ffmpeg -y -i series_out_fade_v2_5images.mp4 -i optimaken_logo.png -filter_complex "[1]lut=a=val*0.5[a];[0][a]overlay=0:0" -c:v libx264 -an v4_output.mp4

  my questions are :

  1. How can I achieve both in a single command
     2. How do I scale overlay proportionally so that the height of the water mark is always 65 pixels and the width is scaled
        proportionally
     3. Explicitly tell where to place the logo to the top right corner with a padding of 10 pixels for both x and y

• ffmpeg build thumbnail sequence while transcoding

  9 novembre 2018, par Redtopia

  With the goal of improving performance while processing a video file and outputting it into 3 parallel output files, would it be possible to also build a thumbnail sequence as another parallel output or in another process ?

  To create the 3 parallel outputs, I’m following the example on this page : https://trac.ffmpeg.org/wiki/Creating%20multiple%20outputs

  ...and using this example :

  ffmpeg -i input \
  
      -s 1280x720 -acodec … -vcodec … output1 \
  
      -s 640x480  -acodec … -vcodec … output2 \
  
      -s 320x240  -acodec … -vcodec … output3

  My command to generate thumbnails looks like this :

  ffmpeg -f image2 -ss 2 -r "1/3" -s 100x50 ./thumbs/th-%04d.png

  I’m using the ffmpeg 4.1

  What I’m finding is that building a series of thumbnails, say 1 every 10 seconds, can be quite time consuming for large video files, so I’m guessing I could save some processing time if I could build the thumbs at the same time.

• ffmpeg setpts apply uniform offset

  19 novembre 2018, par Vinay

  I have a series of videos that I’m converting from .mov to .ts and then create an HLS playlist for. I’m able to figure out the ending pts for both the audio and video streams of any given video and am trying apply that ending (cumulative) offset when converting later videos in the sequence. For instance :

  1. convert 0.mov -> 0.ts
  2. Get ending pts of audio stream and video stream for 0.ts.
  3. Apply ending video/audio stream as a setpts filter for converting 1.mov -> 1.ts
  4. Repeat

  As an example, I’m using the following command for the second video in the sequence :

  ffmpeg -y -i 1.mov \
  
      -filter:a "asetpts=PTS-STARTPTS+367534" \
  
      -filter:v "setpts=PTS-STARTPTS+363000" \
  
      -codec:v libx264 -crf 18 -preset veryfast \
  
      -acodec aac -muxdelay 0 1.ts

  The offset pts 367534 (audio) and 363000 were grabbed from 0.ts converted before, however, when I do this, 1.ts ends up having a duration of 58s and an offset of 8.31s.

  This is how I’m grabbing the ending pts offset of 0.ts (inspired by https://stackoverflow.com/a/53348545/696130) :

  ffprobe -v 0 \
  
      -show_entries packet=pts,duration -of compact=p=0:nk=1 \
  
      -select_streams a \
  
      0.ts | | sed \'/^\s*$/d\' | tail -1