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• ffmpeg Limit File Size

  18 décembre 2014, par Ben Marinic

  I am converting MPGs into GIF files using ffmpeg. I need to limit the output to 2MB max as this is the maximum GIF size supported on the server. I have tried the -fs switch, however this chops off the video to fit the size. I would rather have the GIF scaled and the quality adjusted. The source videos are limited to 5 seconds, so I’m not trying to fit a video with particularly long duration into a small GIF file size. Some solutions I have seen include checking the file size after conversion, deleting if too large and trying again with modified properties until the desired file size is reached. Is there a more automated approach I could take with ffmpeg ?

• Revision 8d3d2b76f3 : Tx size selection enhancements (1) Refines the modeling function and uses that

  22 juin 2013, par Deb Mukherjee

  Changed Paths :
   Modify /vp9/common/vp9_blockd.h

  
   Modify /vp9/encoder/vp9_encodeframe.c

  
   Modify /vp9/encoder/vp9_onyx_if.c

  
   Modify /vp9/encoder/vp9_onyx_int.h

  
   Modify /vp9/encoder/vp9_rdopt.c

  
  
  Tx size selection enhancements

  (1) Refines the modeling function and uses that to add some speed
  features. Specifically, intead of using a flag use_largest_txfm as
  a speed feature, an enum tx_size_search_method is used, of which
  two of the types are USE_FULL_RD and USE_LARGESTALL. Two other
  new types are added :
  USE_LARGESTINTRA (use largest only for intra)
  USE_LARGESTINTRA_MODELINTER (use largest for intra, and model for
  inter)

  (2) Another change is that the framework for deciding transform type
  is simplified to use a heuristic count based method rather than
  an rd based method using txfm_cache. In practice the new method
  is found to work just as well - with derf only -0.01 down.
  The new method is more compatible with the new framework where
  certain rd costs are based on full rd and certain others are
  based on modeled rd or are not computed. In this patch the existing
  rd based method is still kept for use in the USE_FULL_RD mode.
  In the other modes, the count based method is used.
  However the recommendation is to remove it eventually since the
  benefit is limited, and will remove a lot of complications in
  the code

  (3) Finally a bug is fixed with the existing use_largest_txfm speed feature
  that causes mismatches when the lossless mode and 4x4 WH transform is
  forced.

  Results on derf :
  USE_FULL_RD : +0.03% (due to change in the tables), 0% encode time reduction
  USE_LARGESTINTRA : -0.21%, 15% encode time reduction (this one is a
  pretty good compromise)
  USE_LARGESTINTRA_MODELINTER : -0.98%, 22% encode time reduction
  (currently the benefit of modeling is limited for txfm size selection,
  but keeping this enum as a placeholder) .
  USE_LARGESTALL : -1.05%, 27% encode-time reduction (same as existing
  use_largest_txfm speed feature).

  Change-Id : I4d60a5f9ce78fbc90cddf2f97ed91d8bc0d4f936

• Merge/Join images & video files together using mencoder or ffmpeg

  6 novembre 2015, par Swati

  Hi i have command to merge video files
  but i want to join an image to a video file.

  What i am doing :

  1) convert image to mp4 using ffmpeg

  2) joining this converted video to my selected video using mencoder

  but it prommpts an error :
  cannot mix video only files with audio-video files try -nosound.

  i also added -nosound but with this the resultant file does not contains any audio.

  what to do ?

  ffmpeg command :

  -y -i Garden.jpg -s 640x480 converted.mp4

  this converted .mp4 file is created properly but with no audio

  mencoder command :

  -oac mp3lame -ovc lavc -noodml -o output.mp4 converted.mp4 selected.mp4

  Please help..