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• Concatenate Movies from Python List using MoviePy or FFmpeg

  24 September 2020, by Python_Learner_DK

  I have about 10,000 short videos that I am trying to make several longer videos from.

  



  I've created these videos using MoviePy, but keep getting memory errors when trying to concatenate them back together.

  



  In my code I have an outer loop going through each letter of the alphabet and getting the files that start with that letter.

  



  From the returned video clips I get the length and and strip off the last 3.5 seconds (outro_clip_duration) of the video, and then add it into a Python list clips.

  



  Where I'm stuck is I then want to take this list of trimmed videos and make one long long video from it.

  



  I have all the files, I just need to trim them, concatenate them, and then export them as one.

  



  I've tried many times with different MoviePy attempts and keep getting MemoryErrors so I gave up and took a swing at an ffmpeg solution seen here but it is not working out either.

  



  The latest version of the main part of my code is here:

  



  clips = []
outro_clip = mpy.VideoFileClip('Logo_Intro_w_Stinger_Large.mp4')
outro_clip_duration = outro_clip.duration
for def_image in vid_list_long:
    video_item = mpy.VideoFileClip('F:/sm_My_Video/sm_%s.mp4' % def_image)
    video_item_duration = video_item.duration
    clips.append(ffmpeg_extract_subclip(video_item,0,(video_item_duration - outro_clip_duration), targetname = def_image))

# #Append the outro_clip to the end 
clips.append(mpy.VideoFileClip('Logo_Intro_w_Stinger_Large.mp4',target_resolution = (h,w),audio=True))
slided_clips = [CompositeVideoClip([clip.fx( transfx.crossfadein, transition_seconds)]) for clip in clips]
#added 'method = compose' NEED TO TEST - supposedly removes the weird glitches.
c = concatenate_videoclips(slided_clips, method = 'compose')
c.write_videofile('F:/Extended_Play/%s_Extended_Play_vid.mp4' % letter,fps=23.98)


  



  My PC is Windows 10 and I have 32 GB of RAM running Anaconda and Python 3.

  


• How to get DirectShow device list with ffmpeg in c++?

  24 August 2018, by fyo

  I’m trying to get dshow device list with ffmpeg. I cannot get it but ffmpeg gets it by its own. Here is the code. It returns AVERROR(ENOSYS) for avdevice_list_input_sources. But avformat_open_input prints all devices. How can I get dshow devices and options in c++ code.

      avdevice_register_all();
  
      AVInputFormat *iformat = av_find_input_format("dshow");
  
      printf("========Device Info=============\n");
  
      AVDeviceInfoList *device_list = NULL;
  
      AVDictionary* options = NULL;
  
      //av_dict_set(&options, "list_devices", "true", 0);
  
      int result = avdevice_list_input_sources(iformat, NULL, options, &device_list);
  
  
  
      if (result < 0)
  
          printf("Error Code:%s\n", av_err2str(result));//Returns -40 AVERROR(ENOSYS)
  
      else printf("Devices count:%d\n", result);
  
  
  
      AVFormatContext *pFormatCtx = avformat_alloc_context();
  
      AVDictionary* options2 = NULL;
  
      av_dict_set(&options2, "list_devices", "true", 0);
  
      avformat_open_input(&pFormatCtx, NULL, iformat, &options2);
  
      printf("================================\n");

• Revision 9ab47772bd: Update README - new date - add VP9 to the title - update list of available targ

  2 August 2013, by Paweł Hajdan

  Changed Paths:
   Modify /README

  
  
  Update README

   new date
   add VP9 to the title
   update list of available targets

  Change-Id: I56263336db393020bac5da8e42fbac3a276ffb1f