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• How to cut videos automatically using Python with FFmpeg ?

  15 juillet 2021, par sunnydee123

  I'm trying to cut videos automatically using Python with FFmpeg so I don't have to type out the command everytime I want a new video cut. I'm not really sure what I'm doing wrong though, here's the code :

  


  import os

  


  path = r'C:/Users/user/Desktop/folder'

    for filename in os.listdir(path):
       if (filename.endswith(".mp4")): 
           command = "ffmpeg - i" + filename + "-c copy -map 0 -segment_time 00:00:06 -f segment -reset_timestamps 1 output%03d.mp4"
           os.system(command)
       else:
           continue


  


• Artifacts in screen captures from h.264 video using python-ffvideo

  8 juin 2015, par ajt

  I am using a python module called python-ffvieo to capture video stills from mkv files that are h.264 encoded. When I perform my screen captures the image files are heavily pixelated and contain many artifacts.

  I have converted one of the mkv files to a flv file and am able to get screen captures from it with no artifacts or pixilation. I am wondering if this is a codec issue or something similar, but I am not sure how even to go about troubleshooting it.

  Here is the information from ffmpeg on the mkv file that I am trying to get the image captures from :

  Input #0, matroska,webm, from 'mm.mkv':
  
    Metadata:
  
      encoder         : libebml v1.3.0 + libmatroska v1.4.1
  
      creation_time   : 2014-10-13 23:55:52
  
    Duration: 00:48:03.71, start: 0.000000, bitrate: 1370 kb/s
  
      Stream #0:0: Video: h264 (High), yuv420p(tv), 1280x720 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
  
      Stream #0:1: Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s (default)

  And here is an image sample of the pixelation that I am talking about :

  

  I know that this isn’t much to go off of and that the python module that I am using is kind of old, but I could really use some help.
  Are these types of artifacts common when there is an encoding issue ? Can anyone tell me what I should be looking into to troubleshoot this ? I appreciate any and all help.

• ffmpeg with Axis P1347 returns 400 Bad Request, but Axis 1357 works

  3 mai 2016, par steampowered

  I have two cameras : an Axis P1347 and an Axis P1357. ffmpeg gets a 400 Bad Request on the P1347 but everything works fine with the P1357.

  I am able to successfully stream rtsp video using vlc from an Axis P1347 Camera using the following url :

  rtsp://10.8.3.85:554/axis-media/media.amp?videocodec=h264&audio=1 

  However, this same url in ffmpeg gives the following for the Axis P1347 Camera :

  root@ubuntu4-virtual-machine:/home/ubuntu4# ffmpeg -re -v verbose  -i "rtsp://10.8.3.85:554/axis-media/media.amp?videocodec=h264&audio=1"
  
  ffmpeg version git-2016-05-02-9fcb59c Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.1)
  
    configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-version3
  
    libavutil      55. 23.100 / 55. 23.100
  
    libavcodec     57. 38.100 / 57. 38.100
  
    libavformat    57. 35.100 / 57. 35.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 44.100 /  6. 44.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  rtsp://10.8.3.85:554/axis-media/media.amp?videocodec=h264&audio=1: Server returned 400 Bad Request

  The same ffmpeg command works great with the nearly identical Axis P1357 Camera :

  root@ubuntu4-virtual-machine:/home/ubuntu4# ffmpeg -re -rtsp_transport tcp -i "rtsp://10.8.3.90:554/axis-media/media.amp?videocodec=h264&audio=1"
  
  ffmpeg version git-2016-05-02-9fcb59c Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.1)
  
    configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-version3
  
    libavutil      55. 23.100 / 55. 23.100
  
    libavcodec     57. 38.100 / 57. 38.100
  
    libavformat    57. 35.100 / 57. 35.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 44.100 /  6. 44.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, rtsp, from 'rtsp://10.8.3.90:554/axis-media/media.amp?videocodec=h264&audio=1':
  
    Metadata:
  
      title           : Media Presentation
  
    Duration: N/A, start: 0.083300, bitrate: N/A
  
      Stream #0:0: Video: h264 (Main), yuvj420p(pc, bt709), 2592x1944 [SAR 1:1 DAR 4:3], 12 tbr, 90k tbn
  
      Stream #0:1: Audio: aac (LC), 16000 Hz, mono, fltp

  Obviously rtsp is turned on and working if vlc can display video, correct ? So why does VLC work with the camera, but not ffmpeg ? Note ffmpeg is installed and works correctly with a similar camera.