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• Trying to add intro on big amount of videos

  26 novembre 2019, par somerandomdude

  first time asking a question here so sorry if im not doing it right.

  so i’ve got lots of videos on different folders. im trying to add an intro and a watermark on them all
  watermark should be added to the video and then the intro should be added after.
  i tried ffmpeg on a video it worked but the video is so damn slow like x.25 or something

  im trying to write a batch script that does the whole thing on all folders.
  some of them are like :
  folder/video.mp4
  folder/subfolder/subfolder/video.mp4

  i don’t know how to deal with those and im talking like 6k videos.

  again sorry if im not doing it right.
  i tried something like this : in batch.

  (for %%i in (*.mp4) do @echo file '%%i') > ./list.txt
  
  ffmpeg -f concat -i ./list.txt -c copy ./output.mp4
  
  PAUSE

• Is it possible to use nvidia hardware to decode videos in opencv ?

  1er janvier 2016, par Mickey Shine

  I am using opencv 3.1 and try to deal with some video files and also streaming videos (rtps ://..). I installed vdpau and compiled ffmpeg 2.8.4 with vdpau enabled. But opencv seems still not using hardware to deocde videos. I don’t use GPU for video output but the integrated graphics.

  [root@localhost ~]# nvidia-smi dmon
  
  # gpu   pwr  temp    sm   mem   enc   dec  mclk  pclk
  
  # Idx     W     C     %     %     %     %   MHz   MHz
  
      0    72    49     0     0     0     0  3505  1001
  
      1    49    47     0     0     0     0  3505  1001
  
      0    73    49     0     0     0     0  3505  1001

  The ’dec’ were always 0. So any advices ?

• How to bulk insert an audio clip into a batch of videos using ffmpeg

  6 décembre 2018, par Date Captain

  I have a batch of videos, all in MP4 with different lenghts. I would like to insert a specific audio file exactly at the 30 second mark on ALL of the videos.

  For example. if the video file were 1 min & the audio file that i wanted to insert was about 3 seconds long.

  It would go like

  0.0-0.30- Original video with it’s audio
  0.30-0.33- Original video with the Custom audio cue
  0.33-1.00- Original Video with its audio

  ffmpeg -i a.mp4 -itsoffset 00:00:10 -i b.mp3 -map 0:0 -map 1:0 -preset ultrafast o.mp4

  • This does something close to the end result. But
    1. It the entirely mutes the videos audio
    2. Will only work for a single video. Need to batch convert everything in the folder.