Recherche avancée

Sur d’autres sites (5934)

• ffmpeg : unable to cut avi movie

  10 mars 2016, par ird

  I am using ffmpeg to cut video file :

  ffmpeg -<inputfile> -ss 00:00:00 -t 00:00:30 <outputfile>
  
  </outputfile></inputfile>

  It’s OK for different file formats exclude *.avi format. For avi movies ffmpeg shows that video is truncated, but output file contains full video (without truncating).
  Does anybody know possible ways for problem troubleshooting ?

  Here converting command output for avi file :

  FFmpeg version SVN-r26402, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Feb  1 2011 02:54:36 with gcc 4.4.5
  
    configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-x11grab
  
    libavutil     50.36. 0 / 50.36. 0
  
    libavcore      0.16. 1 /  0.16. 1
  
    libavcodec    52.108. 0 / 52.108. 0
  
    libavformat   52.93. 0 / 52.93. 0
  
    libavdevice   52. 2. 3 / 52. 2. 3
  
    libavfilter    1.74. 0 /  1.74. 0
  
    libswscale     0.12. 0 /  0.12. 0
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
  [mpeg4 @ 0x91e7e10] Invalid and inefficient vfw-avi packed B frames detected
  
  
  
  Seems stream 0 codec frame rate differs from container frame rate: 30000.00 (30000/1) -> 25.00 (25/1)
  
  Input #0, avi, from '/home/mightymeeting/Videos/tam-19.avi':
  
    Duration: 00:04:43.32, start: 0.000000, bitrate: 564 kb/s
  
      Stream #0.0: Video: mpeg4, yuv420p, 352x208 [PAR 1:1 DAR 22:13], 25 fps, 25 tbr, 25 tbn, 30k tbc
  
      Stream #0.1: Audio: mp3, 32000 Hz, 2 channels, s16, 80 kb/s
  
  [buffer @ 0x91e6ed0] w:352 h:208 pixfmt:yuv420p
  
  Output #0, avi, to 'out.avi':
  
    Metadata:
  
      ISFT            : Lavf52.93.0
  
      Stream #0.0: Video: mpeg4, yuv420p, 352x208 [PAR 1:1 DAR 22:13], q=2-31, 200 kb/s, 25 tbn, 25 tbc
  
      Stream #0.1: Audio: mp2, 32000 Hz, 2 channels, s16, 64 kb/s
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
    Stream #0.1 -> #0.1
  
  Press [q] to stop encoding
  
  [mpeg4 @ 0x91e7e10] Invalid and inefficient vfw-avi packed B frames detected
  
  frame= 7082 fps=999 q=2.0 Lsize=    7513kB time=30.02 bitrate=2049.8kbits/s dup=0 drop=1    
  
  video:7079kB audio:235kB global headers:0kB muxing overhead 2.718192%

• On Heroku I got FFMPEG::Error (Failed encoding.Errors : encoded file is invalid. Full output : )

  8 octobre 2020, par Ruslan Valeev

  The code is :

  


  tempfile = Tempfile.open('content')
tempfile.write(content)
movie = FFMPEG::Movie.new(tempfile.path)
screenshot_temp_file = Tempfile.open('screenshot')
movie.screenshot(screenshot_temp_file.path)


  


  everything works fine locally, but when I try this on Heroku I got error at last row :

  


  irb(main):013:0> movie.screenshot(screenshot_temp_file.path)&#xA;I, [2020-10-07T15:48:27.132114 #7]  INFO -- : Running transcoding...&#xA;["/app/vendor/ffmpeg/ffmpeg", "-y", "-i", "/tmp/content20201007-7-1g1955b", "-vframes", "1", "-f", "image2", "/tmp/screenshot20201007-7-1mmts7s"]&#xA;&#xA;E, [2020-10-07T15:48:27.190572 #7] ERROR -- : Failed encoding...&#xA;["/app/vendor/ffmpeg/ffmpeg", "-y", "-i", "/tmp/content20201007-7-1g1955b", "-vframes", "1", "-f", "image2", "/tmp/screenshot20201007-7-1mmts7s"]&#xA;&#xA;&#xA;Errors: encoded file is invalid. &#xA;&#xA;Traceback (most recent call last):&#xA;        7: from /app/bin/irb:30:in `<main>&#x27;&#xA;        6: from /app/bin/irb:30:in `load&#x27;&#xA;        5: from /app/vendor/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/irb-1.0.0/exe/irb:11:in `<top>&#x27;&#xA;        4: from (irb):13&#xA;        3: from /app/vendor/bundle/ruby/2.6.0/gems/streamio-ffmpeg-3.0.2/lib/ffmpeg/movie.rb:204:in `screenshot&#x27;&#xA;        2: from /app/vendor/bundle/ruby/2.6.0/gems/streamio-ffmpeg-3.0.2/lib/ffmpeg/transcoder.rb:45:in `run&#x27;&#xA;        1: from /app/vendor/bundle/ruby/2.6.0/gems/streamio-ffmpeg-3.0.2/lib/ffmpeg/transcoder.rb:112:in `validate_output_file&#x27;&#xA;FFMPEG::Error (Failed encoding.Errors: encoded file is invalid. Full output: )&#xA;</top></main>

  


  I've try to pass some options, like :seek_time and validate: false but nothing changed. What am I doing wrong ? Thank you so much !

  


  EDIT :
After Full output: ) there is nothing.
I've install FFMPEG buildpack on Heroku, and can see it in ui :

  


  

  


• ffmpeg output file size grows faster than linearly with movie length

  14 janvier 2021, par Jakob Filser

  I'm using ffmpeg to string together some .bmp images into a movie. In total, there are 1001 frames, amounting to 0:40 length. The command I'm using is

  


  ffmpeg -f image2 -i render.%05d.bmp -c:v libx264 -s 512:268 render.mp4


  


  The output file is 33,2 MB large, which is about twice the size of a full HD (about 16 times the pixels !) video of the same length. Apart from the file size being unreasonably large, I realized it grows faster than linearly (can't tell exactly if it is quadratic, exponential etc.) with the number of frames. After 100 frames it is about 1536 KB large (which is already too large), after 500 frames it is already 15104 KB, and after 1001 it finally arrives at 34085 KB.

  


  My educated guess would be that for each frame it stores some information about all of the previous frames again, which makes absolutely no sense.

  


  What am I doing wrong ? Before you recommend libx265 to me : It turns the entire video green.