Recherche avancée

Sur d’autres sites (4981)

• ffmpeg create thumbnail sprites with duplicate frames

  5 mars 2019, par Kuipert

  I’m using ffmpeg to create thumbnail sprites for a video player and the player requires a sprite to be 101 frames. For videos that have less then 101 frames in total, I’m trying to add some frames multiple times to the sprite, for example :

  ffmpeg -y -i input.mp4 -frames 1 -q:v 1 -vf "select=eq(n\,0)+eq(n\,0)+eq(n\,1)+eq(n\,1)+eq(n\,2)+eq(n\,2)...+eq(n\,30)+eq(n\,30),scale=178:134,tile=101x1" output.jpg

  With this command ffmpeg is skipping the duplicate frames and adding black frames to the end of the sprite.
  Sprite example

  Is it possible to let ffmpeg add duplicate frames ?

• Merge three media files (Video and image) into one

  8 avril 2019, par Munshi Arif Rashid

  I have total three separated media files. The first file is 1600X900 .mp4 file which will be placed at the left side of the screen (Height size will be full screen and width will cover two-thirds of the screen). The second file is 640X480 .png file which will be placed at the upper right of the screen (Height size will be half of the screen and width will cover one-third of the screen). The third file is 640X480 .webm file which will be placed at the lower right of the screen (Height size will be half of screen and width will cover one-thirds of the screen). I want to merge these three files in a single screen as mentioned above. Can anyone help me ? Thanks

• truehd : add hand-scheduled ARM asm version of ff_mlp_rematrix_channel.

  20 mars 2014, par Ben Avison

  truehd : add hand-scheduled ARM asm version of ff_mlp_rematrix_channel.
  Profiling results for overall audio decode and the rematrix_channels function
  
  in particular are as follows :
                Before          After
  
                Mean   StdDev   Mean   StdDev  Confidence  Change
  
  6:2 total     370.8  17.0     348.8  20.1    99.9%       +6.3%
  
  6:2 function  46.4   8.4      45.8   6.6     18.0%       +1.2%  (insignificant)
  
  8:2 total     343.2  19.0     339.1  15.4    54.7%       +1.2%  (insignificant)
  
  8:2 function  38.9   3.9      40.2   6.9     52.4%       -3.2%  (insignificant)
  
  6:6 total     658.4  15.7     604.6  20.8    100.0%      +8.9%
  
  6:6 function  109.0  8.7      59.5   5.4     100.0%      +83.3%
  
  8:8 total     896.2  24.5     766.4  17.6    100.0%      +16.9%
  
  8:8 function  223.4  12.8     93.8   5.0     100.0%      +138.3%
  The assembly version has also been tested with a fuzz tester to ensure that
  
  any combinations of inputs not exercised by my available test streams still
  
  generate mathematically identical results to the C version.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavcodec/arm/mlpdsp_armv5te.S
  • [DH] libavcodec/arm/mlpdsp_init_arm.c