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• Moviepy has issues when concatenating ImageClips of different dimensions

  22 mars 2021, par Lysander Cox

  Example of the issues : https://drive.google.com/file/d/1WxfYtDTD0kc_4WQzzvB6QXkZWo-e2Vuk/view?usp=sharing

  


  Here's the code that led to the issue :

  


  def fragmentConcat(comment, filePrefix):
    finalClips = []
    dirName = filePrefix + comment['id']
    vidClips = [mpy.VideoFileClip(dirName + '/' + file) for file 
                in natsorted(os.listdir(dirName))]
    
    finalClip = mpy.concatenate_videoclips(vidClips, method = "compose")
    finalClips.append(finalClip)
    
    if 'replies' in comment:
        for reply in comment['replies']:
            finalClips += fragmentConcat(reply, filePrefix)
            
    return finalClips

def finalVideoMaker(thread):
    fragmentGen(thread)
    filePrefix = thread['id'] + '/videos/'

    #Clips of comments and their children being read aloud.
    commentClips = []

    for comment in thread['comments']:
        commentClipFrags = fragmentConcat(comment, filePrefix)
        commentClip = mpy.concatenate_videoclips(commentClipFrags, method = "compose")
        commentClips.append(commentClip)

        #1 second of static to separate clips.
        staticVid = mpy.VideoFileClip('assets/static.mp4')
        commentClips.append(staticVid)

    finalVid = mpy.concatenate_videoclips(commentClips)
    finalVid.write_videofile(thread['id'] + '/final.mp4')


  


  I'm certain that these issues appear somewhere in here, because the individual video "fragments" (which are concatenated here) do not exhibit the issue with the clip I showed.

  


  I have tried adding and removing the method = "compose" parameter. It does not seem to have an affect. How can I resolve this ? Thanks.

  


• Command Line 'hls_segment_size' creates TS files with segment failures

  14 octobre 2019, par Phantom

  I am converting a simple mp4 video to hls but I need the segments to be in approximately a specific size

  I researched and found :

  -hls_segment_size 17000000

  17000000 bytes( 17MB)

  This creates TS files with approximate sizes, (does not have to be exact size)

  ffmpeg.exe -i "in.mp4" -vcodec copy -acodec aac -hls_list_size 0 -hls_segment_size 17000000 -f hls "out.m3u8"

  In the m3u8 file is created ’#EXT-X-BYTERANGE’, which is the way I want it

  #EXTM3U
  
  #EXT-X-VERSION:4
  
  #EXT-X-TARGETDURATION:10
  
  #EXT-X-MEDIA-SEQUENCE:0
  
  #EXTINF:8.400000,
  
  #EXT-X-BYTERANGE:1662108@0
  
  SampleVideo_1280x720_30mb0.ts
  
  #EXTINF:4.560000,
  
  #EXT-X-BYTERANGE:383896@0
  
  SampleVideo_1280x720_30mb1.ts
  
  #EXTINF:3.120000,
  
  #EXT-X-BYTERANGE:408712@383896
  
  SampleVideo_1280x720_30mb1.ts
  
  #EXTINF:5.640000,
  
  #EXT-X-BYTERANGE:1161840@0
  
  SampleVideo_1280x720_30mb2.ts
  
  #EXTINF:1.880000,
  
  #EXT-X-BYTERANGE:230864@0
  
  SampleVideo_1280x720_30mb3.ts
  
  #EXTINF:2.160000,
  
  #EXT-X-BYTERANGE:330880@230864
  
  SampleVideo_1280x720_30mb3.ts
  
  #EXTINF:2.080000,
  
  #EXT-X-BYTERANGE:489928@0
  
  SampleVideo_1280x720_30mb4.ts
  
  #EXTINF:4.400000,
  
  #EXT-X-BYTERANGE:1564348@489928
  
  SampleVideo_1280x720_30mb4.ts
  
  ...

  It seems alright, but it has a little problem. I’m testing on a player in the browser, and when the seconds goes from one segment to the other the video has a lock in sound and video. Something very annoying, not natural in the video.

  Not using ’-hls_segment_size’ will have functional TS files, and without BYTERANGE in the m3u8 file

  However, the size of the TS file will be according to the seconds defined

  I am currently trying to get a ts file that is close to a size set between 15MB and 20MB, and have BYTERANGE in the m3u8 file.

  Does anyone have any ideas ?

  here’s the problem I’m trying to describe :

  http://phantsc.rf.gd/AAA/Bbb.html

  exactly in the second 7 of the video a ’locking’ happens, this happens when going from one segment to another

• fftools/ffmpeg : rework initializing encoders with no frames

  6 juillet 2023, par Anton Khirnov

  fftools/ffmpeg : rework initializing encoders with no frames
  When no frames were passed from a filtergraph to an encoder, but the
  
  filtergraph is configured (i.e. has output parameters), encoder flush
  
  code will use those parameters to initialize the encoder in a last-ditch
  
  effort to produce some useful output.
  Rework this process so that it is triggered by the filtergraph, which
  
  now sends a dummy frame with parameters, but no data, to the encoder,
  
  rather than the encoder reaching backwards into the filter.
  This approach is more in line with the natural data flow from filters to
  
  encoders and will allow to reduce encoder-filter interactions in
  
  following commits.
  This code is tested by fate-adpcm-ima-cunning-trunc-t2-track1, which (as
  
  confirmed by Zane) is supposed to produce empty output.
  

  • [DH] fftools/ffmpeg_enc.c
  • [DH] fftools/ffmpeg_filter.c