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• Various small spelling fixes.

  14 avril 2014, par Reimar Döffinger

  Various small spelling fixes.
  Signed-off-by : Reimar Döffinger <Reimar.Doeffinger@gmx.de>
  

  • [DH] doc/demuxers.texi
  • [DH] libavcodec/atrac1data.h
  • [DH] libavcodec/avcodec.h
  • [DH] libavcodec/dirac_dwt.h
  • [DH] libavcodec/dnxhddata.h
  • [DH] libavcodec/error_resilience.h
  • [DH] libavcodec/fft_table.h
  • [DH] libavcodec/get_bits.h
  • [DH] libavcodec/rv30data.h
  • [DH] libavdevice/avdevice.h
  • [DH] libavformat/internal.h
  • [DH] libavformat/mux.c

• 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.

• FFMPEG compilation without non free and without gpl not working properly

  27 décembre 2019, par sarun

  I tried to compile ffmpeg for LGPL (without nonfree and with out gpl).

  I used following commands while configuring as mentioned in many blogs

  configure --prefix=/home/sarun/ffmpeg-build/FFmpeg-release-4.0/build --bindir=/home/sarun/ffmpeg-build/FFmpeg-release-4.0/build/bin --libdir=/home/sarun/ffmpeg-build/FFmpeg-release-4.0/build/lib --shlibdir=/home/sarun/ffmpeg-build/FFmpeg-release-4.0/build/slib --incdir=/home/sarun/ffmpeg-build/FFmpeg-release-4.0/build/include --datadir=/home/sarun/ffmpeg-build/FFmpeg-release-4.0/build/data --mandir=/home/sarun/ffmpeg-build/FFmpeg-release-4.0/build/man --pkgconfigdir=/home/sarun/ffmpeg-build/FFmpeg-release-4.0/build/slib/pkgconfig --disable-static --enable-shared

  after compilation i could still see non free codecs and gpl elements as part of installed libraries
  please help me whether i am missing anything, i want to create LGPL version for my work.