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• Is -vfilter not available on Debian 5 ?

  3 octobre 2011, par Kor

  I'm getting problems trying to make my website (done in PHP) work online.
  At a specific time, I need to upload a video and convert it, also scaling its dimensions. I use a call like this one :

  ffmpeg -y -i '/path/to/video.mp4' -f flv -ab 56 -ar 22050 -r 20 -vfilter "scale=704:-1" '/path/to/new/video.flv'

  It works offline on my computer (Ubuntu 10.10), but it doesn't do the same online (Debian Lenny 5.0). The response I get from the server is :

  [Mon Oct 03 15:48:56 2011] [error] [client 81.184.6.124] /servers/path/to/ffmpeg: unrecognized option '-vfilter'

  I have also tried with '-vf', but it just doesn't work at all. So my question is, am I doing it wrong, or is it that Debian unables video filters for some reason ?

  I give you some info about this server :

  Debian 5.0
  
  PHP: 5.2.6
  
  FFmpeg r11872+debian_0.svn20080206-18+lenny1
  
  libavutil   3212800
  
  libavcodec  3355136
  
  libavformat 3409664
  
  libavdevice 3407872

  EDIT : Oh my, I just saw it. No libavfilter installed. I'll tell you what their support tells me in a couple hours.

• Same command but different result, odd behavior between cmd and python subprocess

  22 juin 2020, par Josh Katz

  Hello and thanks everyone, I am having a very strange phenomenon and I hope you can help me solve it, I run a command through the cmd to save video coming from a camera to a local file in my computer,the command is :

  


  ffmpeg -rtsp_transport tcp -i "rtsp ://root:senswim2018@10.0.0.101/axis-media/media.amp" -c copy foo.mp4

  


  when I run the command through the cmd it works fine (recorded a video longer than 12 hours), but when I run it as a command "Using the subprocess in Python, it only records around 5:30 minutes

  


  cmd = ["ffmpeg","-rtsp_transport","tcp", "-i", "rtsp ://root:senswim2018@10.0.0.101/axis-media/media.amp" ,"-c", "copy","foo.mp4"]

  


  process = subprocess.Popen(cmd , stdout=subprocess.PIPE, stderr=subprocess.STDOUT)

  


  time.sleep(600000)

  


  process.terminate()

  


  This matter is very confusing and unclear to me, I would be very happy if you could give some insight thanks.

  


• Concat videos too slow using Python MoviePY

  29 juin 2021, par Mathematics

  I am joining 50s or more videos of 1,2,3 minutes using MoviePY but it's giving me 20 hours, even though I have 64 GB of ram, i7 and GTX 670, not top of range yet reasonable. Is there anyway I can speed this process up ?

  



  padding = 10 # padding option
video_clips = [VideoFileClip(video_dir + video) for video in os.listdir(video_dir)]
video_fx_list = [video_clips[0]]

idx = video_clips[0].duration - padding
for video in video_clips[1:]:
video_fx_list.append(video.set_start(idx).crossfadein(padding))
idx += video.duration - padding

final_video = CompositeVideoClip(video_fx_list)
final_video.write_videofile(video_dir + 'myoutfile.mp4', fps=24)


  



  I don't need original audio these clips have, would removing it going to speed things up ? not sure how to remove audio though/