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• Concatenate Movies from Python List using MoviePy or FFmpeg

  24 septembre 2020, par 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.

  


• Need help to change working ffmpeg command to overlay instead of concatenate two audio files at specific position

  7 mars 2019, par lukistar

  By asking another question here, I got working code

  ffmpeg -i input.mp3 -i second.mp3 -filter_complex "[0:a]atrim=end=10,asetpts=N/SR/TB[begin];[0:a]atrim=start=10,asetpts=N/SR/TB[end];[begin][1:a][end]concat=n=3:v=0:a=1[a]" -map "[a]" output

  The code inserts second.mp3 into the input.mp3 at 10 seconds.

  But now I need to overlay second.mp3 into the input.mp3 starting at 10seconds.
  In other words I need playing input.mp3 and after 10 seconds I need start playing second.mp3 simultaneously.

  The code I have been given keeps the params of input.mp3 and changes everything about second.mp3 to match input.mp3.

  Could you help me altering the command I have to do the overlay...

• How to fix ffmpeg & mencoder pushing Persian (RTL) subtitles reversed ?

  5 avril 2019, par sheshkovsky

  I’m trying to build an application to burn subtitles on videos. The specific task to do is burning Persian (Right-to-left language) subtitles. But I have a problem with it.

  When I got several words simuntaneously without any "Enter" between them, the ffmpeg or mencoder push the lines to up. for example if I have three lines, the third lines comes on first line, then the second line, and then the first line prints on the screen.

  I have attached two screenshot to be clear about it. As you may see in the second one, there are 9 lines of persian subtitle which should be aligned from 1 on top to 9 on the bottom, but the 9th line appears on the first line on top.

  

  

  I’m using this code at the moment to burn the subtitles on mp4 videos :

  mencoder video.mp4 -sub subtitle.srt -utf8  -o output.mp4 -oac pcm -ovc lavc