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• FFmpeg - add an animated gif (cropped by mask) to the video

  11 mars 2021, par zeromodule

  I have 3 inputs :

  


  

  1. Video file : https://file.io/6jtUlnZ7TGmT

  


  2. Animated GIF with transparent background https://i.imgur.com/Vo3KHZm.gif

  


  3. Mask file (BW) the same resolution as the video https://i.imgur.com/YJXUUrZ.png

  


  


  I want to put the image on the video, but throw out all GIF pixels that are transparent in the mask (replace them with transparent ones).

  


  
  

  

  


  


  My current command, without masking (it works fine) :

  


  ffmpeg -i input.mp4 -ignore_loop 0 -i animation.gif \
-filter_complex "[1]scale=700x700[scaled_gif];\
[0][scaled_gif]overlay=50:30:shortest=1" \
-codec:a copy output.mp4


  


  UPDATE #1

  


  I managed to get closer to my goal with this command :

  


  ffmpeg -y -i input.mp4 -loop 1 -i mask.png \ 
-filter_complex "[1:v]alphaextract[mask]; \
movie=animation.gif,scale=1920x1080[scaled_gif]; \
[scaled_gif][mask]alphamerge[masked]; \
[0:v][masked]overlay=0:0" \
-c:a copy output_masked.mp4


  


  but it has 2 problems :

  


  

  1. GIF loses it's transparency. Transparent pixels become white.

  


  2. GIF plays only once (i.e. no loop)

  


  


  Output : https://file.re/2021/03/11/outputmasked/

  


• Using `grab_frame` with `FFMpegFileWriter` Yields Error in the Figure Argument to Subprocess

  7 juillet 2024, par GPU Programmer

  I want to generate an MP4 file using frames produced by a rather complicated simulation. If I have to watch the movie as a side affect of generating it I will not complain too much, but would rather not "show" anything on the screen. The overhead of making the movie is trivial compared to the simulations, so I care much more about clean simple code than about performance.

  


  It seemed natural to use grab_frame with FFMpegFileWriter. The following code seemed right.

  


  fig, ax = plot.subplots(figsize=(6.5, 6.5))

assert(animation.FFMpegFileWriter().isAvailable())
writer = animation.FFMpegFileWriter(fig)
writer.setup(fig, "test1.mp4",224)

with writer.saving(fig,"test1.mp4", dpi=224):
    for i in range(len(frameSeg)):
        PlotFrame(i)
        writer.grab_frame()

# writer.finish()

print("done")


  


  It runs, but yeilds the following error

  


  


  [image2 demuxer @ 0000021fab8c1000] Unable to parse option value "Figure(650x650)" as video rate
[image2 demuxer @ 0000021fab8c1000] Error setting option framerate to value Figure(650x650).
[in#0 @ 0000021fab8c1e00] Error opening input : Invalid argument
Error opening input file ... AppData\Local\Temp\tmpe19ci2wz\tmp%07d.png.
Error opening input files : Invalid argument

  


  


  


  subprocess.CalledProcessError : Command '['ffmpeg', '-framerate', 'Figure(650x650)', '-i', 'F :\Users\Kenne.DESKTOP-BT6VROU\AppData\Local\Temp\tmpe19ci2wz\tmp%07d.png', '-loglevel', 'error', '-vcodec', 'h264', '-pix_fmt', 'yuv420p', '-y', 'test1.mp4']' returned non-zero exit status 4294967274.

  


  


  Did I miss something in setup, is it an installation problem, or is it a bug ?

  


  By the way using FFMpegWRiter with FuncAnimation works ...

  


• Python script creates too short video using ffmpeg

  25 mai 2014, par Majzlik

  I use python script to create multiple pictures and call ffmpeg to create video. But there is a problem, because ffmpeg use just few pictures (about 7 - 10 from 160), but throws no error. I’ve tried the same command from commandline and video was correct. I’m calling ffmpeg this way :

  ffmpeg_call = ["ffmpeg", "-r", str(FPS), "-b", "16777216", "-y", "-i", "./sample_%05d.png", FILEOUTNAME + ".mp4"]
  
  subprocess.call(ffmpeg_call)

  and this was command in commandline :

  ffmpeg -r 25 -b 16777216 -y -i ./sample_%05d.png animation.mp4

  I’ve printed these commands to compare and they were the same, so there has to be problem in ffmpeg + python cooperation. Don’t you know, how to fix it ?

  UPDATE :

  this is log from ffmpeg :

  ffmpeg version 0.8.10-4:0.8.10-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav     developers
  
    built on Feb  6 2014 20:56:59 with gcc 4.6.3
  
  *** THIS PROGRAM IS DEPRECATED ***
  
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
  
  Input #0, image2, from '/tmp/tmpRKxT6s/ampgraph/tmp/sample_%05d.png':
  
  Duration: 00:00:00.44, start: 0.000000, bitrate: N/A
  
  Stream #0.0: Video: png, pal8, 640x480, 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  Incompatible pixel format 'pal8' for codec 'mpeg4', auto-selecting format 'yuv420p'
  
  [buffer @ 0x19e18a0] w:640 h:480 pixfmt:pal8
  
  [avsink @ 0x19ee1c0] auto-inserting filter 'auto-inserted scaler 0' between the filter 'src' and the filter 'out'
  
  [scale @ 0x19e2fc0] w:640 h:480 fmt:pal8 -> w:640 h:480 fmt:yuv420p flags:0x4
  
  Output #0, mp4, to './ampgraph/animation.mp4':
  
    Metadata:
  
      encoder         : Lavf53.21.1
  
      Stream #0.0: Video: mpeg4, yuv420p, 640x480, q=2-31, 200 kb/s, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
  Press ctrl-c to stop encoding
  
  frame=   11 fps=  0 q=2.5 Lsize=      46kB time=0.44 bitrate= 859.1kbits/s    
  
  video:45kB audio:0kB global headers:0kB muxing overhead 1.906569%