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• lavfi/movie : return proper error code in case of av_get_token() allocation failure

  6 novembre 2012, par Stefano Sabatini

  lavfi/movie : return proper error code in case of av_get_token() allocation failure

• Combining a movie file with a text file

  12 décembre 2012, par Hugo

  Current Status : I have a movie I recorded on a microscopy and a .txt file with two columns : time and temperature. This file is synchronous with the video.
  I would like to 'edit' the video so there is a text box with the temperature that would update as the movie plays.

  My approach, for the moment, is to use ffmpeg. I managed to draw some text and it seems all is working as intended.

  The problem is : I can't find any reference on how to update that text dynamically. I am using some Python to read the file and launch ffmpeg with subprocess.

  I would like to ask if anyone knows some workaround for this. Maybe some other approach.

• ffmpeg make image and movie in one command

  22 juin 2012, par knishua

  this is the situation :
  given a thumbnail, i need to overlay it on top of an image.

  so, i need to scale image pass it as parameter to overlay pass that to drawtext.

  I have got so far, adding multiple text + overlay + thumbnail,

  1. ffmpeg -threads 8 -i D:/imagesequence/background.jpg -vf "movie='D\:/imagesequence/dpx/thumbnail.jpg' [watermark]; [in][watermark] overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/3[water];[water] drawtext=fontsize=32:fontcolor=White:fontfile=/Windows/Fonts/arial.ttf:text='shotName':x=(w)/2:y=(h)-50,drawtext=fontsize=28:fontcolor=White:fontfile=/Windows/Fonts/arial.ttf:text='Notes \:':x=(w)/5:y=(h)-90,drawtext=fontsize=28:fontcolor=White:fontfile=/Windows/Fonts/arial.ttf:text='Frame Range \:':x=(w)/5:y=(h)-130,drawtext=fontsize=28:fontcolor=White:fontfile=/Windows/Fonts/arial.ttf:text='Lens \:':x=(w)/5:y=(h)-170,drawtext=fontsize=28:fontcolor=White:fontfile=/Windows/Fonts/arial.ttf:text='Undistortion \:':x=(w)/5:y=(h)-210,drawtext=fontsize=28:fontcolor=White:fontfile=/Windows/Fonts/arial.ttf:text='Image Sequence \:':x=(w)/5:y=(h)-250,drawtext=fontsize=28:fontcolor=White:fontfile=/Windows/Fonts/arial.ttf:text='Date \:':x=(w)/5:y=(h)-290,drawtext=fontsize=28:fontcolor=White:fontfile=/Windows/Fonts/arial.ttf:text='Element Name \:':x=(w)/5:y=(h)-330,drawtext=fontfile=/Windows/Fonts/arial.ttf:text='FUTUREWORKS':x=130:y=200:fontsize=54:fontcolor=White[out]" D:\imagesequence\dpx\brn_055.0000.dpx

  2. ffmpeg -threads 8 -i D:\imagesequence\dpx\brn_055.%04d.dpx -vf "drawtext=fontfile=/Windows/Fonts/arial.ttf:text='shotcam':x=(w)/2:y=(h)-35:fontsize=24:fontcolor=Yellow,drawtext=fontfile=/Windows/Fonts/arial.ttf:text='Frame \:':x=(w)-600:y=(h)-35:fontsize=24:fontcolor=Yellow,drawtext=fontfile=/Windows/Fonts/arial.ttf:text='Focal Length \:':x=(w)-600:y=(h)-65:fontsize=24:fontcolor=Yellow" D:\imagesequence\dpx\test2.mov

  3. how do i scale an image and pass it to movie, in 1

  4. how do i make a blackscreen size that of an image say
     'D :\imagesequence\dpx\brn_055.0001.dpx' and pass it to input in 1

  5. is it possible do bother 1 and 2 in one command line ( ffmpeg ....)
     i.e. make an image from first point ( 1 ) and continue with making .mov ( of 1 image + input from point 2 )

  or in other words if it is not possible to do (1 + 2) in one command then is it possible to first execute 1 then execute 2 ( but with output from 1)
  do it