Recherche avancée

Sur d’autres sites (10165)

• Merge several mp4 video using ffmpeg and php [on hold]

  8 novembre 2013, par user2969041

  I would like to merge several videos using ffmpeg and php. I want to retrieve the names of the videos dynamically but I can't merge all the videos together I only get i-1 merged videos

  (I can't post the code, each time i would post it occures an error and then i can't post it)

• List Directory of files to text file sorted by creation date but don't show creation creation date in file

  25 mars 2019, par Oli Shingfield

  I’ve been doing some research on this problem but I can’t get my head around it to suit my particular issue.

  I would like to create a text file of a list of files in a directory, sorted by date but I don’t want the date to be shown in the file.
  The code I have so far is :

  #create list of clips to merge
  
  save_path = 'downloads/'
  
  ignored = 'test.bat','mergeclips.bat','draw.bat'
  
  onlyfiles = [f for f in listdir('downloads/') if isfile(join('downloads/', f)) if f not in ignored]
  
  
  
  with open('downloads/clipstomerge.txt', 'w') as f:
  
      for item in onlyfiles:
  
          f.write("file '%s'\n" % item )

  This code ignores the bat files but lists everything else out to a text file in a format ready for ffmpeg to merge the clips. The format of the text file looks like this :

  file 'ARandomClipName.mov'
  
  file 'Butterflies.mov'
  
  file 'Chickens.mov'

  At the moment the files are sorted alphabetically but I would like it to be sorted by creation date.
  Does anyone have any ideas how I could modify my code to fix my problem ?

• FFmpeg : Splitting video into segments of very small size (e.g. 5KB)

  3 avril 2019, par user528827

  I am trying to split a video file into segments that are less than 10KB (ideally 5KB) using FFmpeg.

  The video I am using is this one : https://download.blender.org/peach/bigbuckbunny_movies/BigBuckBunny_320x180.mp4. It already has a low resolution.

  I have tried specifying a very small -segment_time of 00:00:0.04 :

  ffmpeg -i BigBuckBunny_320x180.mp4 -c copy -map 0 -f segment -segment_time 00:00:0.04 BigBuckBunny_320x180_%03d.mp4

  I have tried specifying sequential -segment_frames e.g. 1,2,3,4,5,6,7... etc. :

  ffmpeg -i BigBuckBunny_320x180.mp4 -c copy -map 0 -f segment -segment_frames 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30 -segment_list out.csv BigBuckBunny_320x180_%03d.mp4

  I have also tried to force key frames :

  ffmpeg -i BigBuckBunny_320x180.mp4 -force_key_frames "expr:gte(t,n_forced*0.04)" -c copy -map 0 -f segment -segment_frames 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30 BigBuckBunny_320x180_%03d.mp4

  All of these result in segments 0.5s long with varying file sizes averaging about 50KB.

  username@My-Air:~/dev/video$ less out.csv 
  
  BigBuckBunny_320x180_000.mp4,0.000000,0.500000
  
  BigBuckBunny_320x180_001.mp4,0.500000,1.000000
  
  BigBuckBunny_320x180_002.mp4,1.000000,1.500000
  
  BigBuckBunny_320x180_003.mp4,1.500000,2.000000
  
  BigBuckBunny_320x180_004.mp4,2.000000,2.500000
  
  BigBuckBunny_320x180_005.mp4,2.500000,3.000000
  
  ...
  
  
  
  username@My-Air:~/dev/video/bunny_0.5s_splits$ ls -l
  
  total 134552
  
  -rw-r--r--  1 username  staff    16K 25 Mar 23:40 BigBuckBunny_320x180_000.mp4
  
  -rw-r--r--  1 username  staff    26K 25 Mar 23:40 BigBuckBunny_320x180_001.mp4
  
  -rw-r--r--  1 username  staff    36K 25 Mar 23:40 BigBuckBunny_320x180_002.mp4
  
  -rw-r--r--  1 username  staff    44K 25 Mar 23:40 BigBuckBunny_320x180_003.mp4
  
  -rw-r--r--  1 username  staff    40K 25 Mar 23:40 BigBuckBunny_320x180_004.mp4
  
  -rw-r--r--  1 username  staff    38K 25 Mar 23:40 BigBuckBunny_320x180_005.mp4
  
  -rw-r--r--  1 username  staff    43K 25 Mar 23:40 BigBuckBunny_320x180_006.mp4
  
  -rw-r--r--  1 username  staff    44K 25 Mar 23:40 BigBuckBunny_320x180_007.mp4
  
  -rw-r--r--  1 username  staff    50K 25 Mar 23:40 BigBuckBunny_320x180_008.mp4
  
  -rw-r--r--  1 username  staff    49K 25 Mar 23:40 BigBuckBunny_320x180_009.mp4
  
  -rw-r--r--  1 username  staff    50K 25 Mar 23:40 BigBuckBunny_320x180_010.mp4
  
  -rw-r--r--  1 username  staff    51K 25 Mar 23:40 BigBuckBunny_320x180_011.mp4
  
  -rw-r--r--  1 username  staff    51K 25 Mar 23:40 BigBuckBunny_320x180_012.mp4
  
  -rw-r--r--  1 username  staff    57K 25 Mar 23:40 BigBuckBunny_320x180_013.mp4
  
  -rw-r--r--  1 username  staff    53K 25 Mar 23:40 BigBuckBunny_320x180_014.mp4
  
  -rw-r--r--  1 username  staff    57K 25 Mar 23:40 BigBuckBunny_320x180_015.mp4
  
  -rw-r--r--  1 username  staff    57K 25 Mar 23:40 BigBuckBunny_320x180_016.mp4
  
  -rw-r--r--  1 username  staff    61K 25 Mar 23:40 BigBuckBunny_320x180_017.mp4
  
  ...

  It’s strange that the timestamps are at exactly 0s and 0.5s. Is this limitation of FFmpeg ? I couldn’t find any documentation to verify this.

  Is there any way to get these file sizes down to 5KB ? Is it possible with FFmpeg ? If not, is there another tool I could use ? I looked at GStreamer but couldn’t really see if it was possible and it seems very complicated.

  Any help appreciated. Thanks.