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• How to complex the video and gif and make the watermark loop in FFmpeg ?

  19 août 2017, par Wooi

  I had complex video and gif but the gif was play once time, I also set the loop param , It seem didn’t work any more.

  ffmpeg -y -i /sdcard/Download/Test2/test2.mp4 -loop 1 -i /sdcard/Download/Test2/1.gif -loop 1 -i /sdcard/Download/Test2/2.gif -filter_complex [1:v]rotate=30*PI/180:c=none:ow=rotw(iw):oh=roth(ih)[rotete1];[0:v][rotete1]overlay=main_h-overlay_h-10:main_w-overlay_w-10[overlayout1];[2:v]rotate=30*PI/180:c=none:ow=rotw(iw):oh=roth(ih)[rotete2];[overlayout1][rotete2]overlay=20:20[out3] -map [out3] -map 0:a -codec:a copy /sdcard/Download/Test2/output.mp4

• Python ffmpeg subprocess makes unplayable file, but is right size, and just hangs

  8 juin 2021, par nadermx

  I currently have this subprocess calling ffmpeg.

  


  print("Starting alphamerge")
cmd = "ffmpeg -y -nostats -loglevel 0 -i %s -i %s -filter_complex '[1][0]scale2ref[mask][main];[main][mask]alphamerge' -c:v qtrle %s" % (
            file_path, temp_file, output)
process = sp.Popen(cmd, shell=True, stdout=sp.PIPE, stderr=sp.PIPE)
stdout, stderr = process.communicate()
print('after call')

if stderr:
   return "ERROR: %s" % stderr.decode("utf-8")
print("Process finished")




  


  But the process ends up making a file over 2 gigs, unplayable, and just hangs. It never prints "Process finished", "after call", or an error, it just hangs.

  


  Am I calling subprocess with ffmpeg wrong ?

  


• FFMPEG images to video with reverse sequence with other filters

  4 juillet 2019, par Archimedes Trajano

  Similar to this ffmpeg - convert image sequence to video with reversed order

  But I was wondering if I can create a video loop by specifying the image range and have the reverse order appended in one command.

  Ideally I’d like to combine it with this Make an Alpha Mask video from PNG files

  What I am doing now is generating the reverse using https://stackoverflow.com/a/43301451/242042 and combining the video files together.

  However, I am thinking it would be similar to Concat a video with itself, but in reverse, using ffmpeg

  My current attempt was assuming 60 images. which makes vframes x2

  ffmpeg -y -framerate 20 -f image2 -i \
  
    running_gear/%04d.png -start_number 0 -vframes 120 \
  
    -filter_complex "[0:v]reverse,fifo[r];[0:v][r] concat=n=2:v=1 [v]" \
  
    -filter_complex alphaextract[a]
  
    -map 0:v -b:v 5M -crf 20 running_gear.webm 
  
    -map [a] -b:v 5M -crf 20 running_gear-alpha.web

  Without the alpha masking I can get it working using

  ffmpeg -y -framerate 20 -f image2 -i running_gear/%04d.png \
  
    -start_number 0 -vframes 120 \
  
    -filter_complex "[0:v]reverse,fifo[r];[0:v][r] concat=n=2:v=1 [v]" \
  
    -map "[v]" -b:v 5M -crf 20 running_gear.webm

  With just the alpha masking I can do

  ffmpeg -y -framerate 20 -f image2 -i running_gear/%04d.png \
  
    -start_number 0 -vframes 120 \
  
    -filter_complex "[0:v]reverse,fifo[r];[0:v][r] concat=n=2:v=1 [vc];[vc]alphaextract[a]"
  
    -map [a] -b:v 5M -crf 20 alpha.webm

  So I am trying to do it so the alpha mask is done at the same time.

  Although my ultimate ideal would be to take the images, reverse it get an alpha mask and put it side-by-side so it can be used in Ren’py