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• FFMPEG : Fixing frame rate with filter_complex movie filter

  4 mai 2018, par stevendesu

  With some help from @Gyan I came up with the following FFMPEG command which streams 4 videos simultaneously to 4 separate RTMP endpoints, looping the videos infinitely and keeping the audio and video synchronized :

  ffmpeg \
  
      -filter_complex \
  
          "movie=01.mp4:loop=0[v1];[v1]setpts=N/FRAME_RATE/TB[v1];
  
           amovie=01.mp4:loop=0[a1];[a1]asetpts=N/SR/TB[a1];
  
           movie=02.mp4:loop=0[v2];[v2]setpts=N/FRAME_RATE/TB[v2];
  
           amovie=02.mp4:loop=0[a2];[a2]asetpts=N/SR/TB[a2];
  
           movie=03.mp4:loop=0[v3];[v3]setpts=N/FRAME_RATE/TB[v3];
  
           amovie=03.mp4:loop=0[a3];[a3]asetpts=N/SR/TB[a3];
  
           movie=04.mp4:loop=0[v4];[v4]setpts=N/FRAME_RATE/TB[v4];
  
           amovie=04.mp4:loop=0[a4];[a4]asetpts=N/SR/TB[a4]" \
  
      -map "[v1]" -map "[a1]" \
  
          -c:a libfdk_aac \
  
          -c:v libx264 -preset ultrafast \
  
          -b:v 500k -b:a 32k \
  
          -f flv rtmp://output/01 \
  
      -map "[v2]" -map "[a2]" \
  
          -c:a libfdk_aac \
  
          -c:v libx264 -preset ultrafast \
  
          -b:v 500k -b:a 32k \
  
          -f flv rtmp://output/02 \
  
      -map "[v3]" -map "[a3]" \
  
          -c:a libfdk_aac \
  
          -c:v libx264 -preset ultrafast \
  
          -b:v 500k -b:a 32k \
  
          -f flv rtmp://output/03 \
  
      -map "[v4]" -map "[a4]" \
  
          -c:a libfdk_aac \
  
          -c:v libx264 -preset ultrafast \
  
          -b:v 500k -b:a 32k \
  
          -f flv rtmp://output/04

  This is almost perfect, except that it’s doubling my frame rate :

  frame=20822 fps= 46 q=32.0 q=34.0 q=29.0 q=32.0 size=   57617kB time=00:14:28.39 bitrate= 543.5kbits/s speed=1.92x

  Note the speed=1.92x bit. This is causing the live stream to play at double speed, as well.

  (the original video was approximately 24 fps)

• does movie filter in ffmpeg 4.3.1 support png format picture

  1er janvier 2021, par TONY

  I use ffmpeg's moive filter to add wartermark on my video.
The str is "const char *filter_descr = "movie=test.png:seek_point=3.2, scale=180 :-1, setpts=PTS-STARTPTS [over] ;[in] setpts=PTS-STARTPTS [main] ;[main][over] overlay=16:16 [out]" ;"
it shows that can't find codec, but if the wartermark picture is bmp ,then it's ok.
I found that the png code exists in ffmpeg, it should support png decoder.

  


• ffmpeg is overlying images when making movie from png files of an evolving chart

  15 octobre 2020, par James Carroll

  I am trying to make a movie of a series of charts as they change through time. I have 30 or so still versions of the chart in .png format.

  


  But when I combine them into a movie, the charts are progressively overlaid on top of each other, rather than progressing through time.

  


  I have tried several variations including :

  


  ffmpeg -r 1 -f image2 -start_number 0 -i name%2d.png -q:v 5 movie.wmv


  


  and

  


  ffmpeg -r 1/5 -start_number 1 -i name%2d.png -c:v libx264 -r 30 -pix_fmt yuv420p out.mp4


  


  All do the same thing.

  


  Any idea why this is happening ?

  


  Update 1 :

  


  git repo of sample images and failed movie here : https://github.com/jlc42/MovieTest.git

  


  Update 2 :

  


  Just in case, I tried removing the alpha channel with the following command which I found in another thread Remove alpha channel in an image :

  


  for i in `ls *.png`; do convert $i -background black -alpha remove -alpha off $i; done


  


  because my background is white, I also tried :

  


  for i in `ls *.png`; do convert $i -background white -alpha remove -alpha off $i; done


  


  I THINK I have now successfully removed the alpha channel in the images, but this did not seem to make a difference for what ffmpeg is doing.