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• ffmpeg : combine filter_complex trim, overlay and concat

  4 octobre 2015, par jb_alvarado

  I try to combine different video and audio clips with trimming and a logo on top.

  My syntax looks like this :

  ffmpeg -i "$introVid" -i "$introAud" -i "$mainVid" -i "$mainAud" -i "$outroVid" -i "$outroAud" -i "$logo" -i "$mainVid" -i "$mainAud" \
  
  -filter_complex \
  
  "[2:0]trim=0.4:60[trimV1]; \
  
   [3:0]atrim=0.4:60[trimA1]; \
  
   [trimV1][6:v]overlay=main_w-overlay_w-20:15,fade=in:s=2:d=0.5:alpha=1,fade=out:s=60:d=0.5:alpha=1[fade]; \
  
   [7:0]trim=60.2:72[trimV2]; [8:0]atrim=60.2:72[trimA2]; \
  
   [0:0] [1:0] [fade] [trimA1] [4:0] [5:0] [trimV2] [trimA2] concat=n=4:v=1:a=1[cv][a]; \
  
   [cv]scale=864:480:flags=gauss:interl=0[scal]" \
  
  -map "[scal]" -map "[a]" -pix_fmt yuv420p -c:v libx264 -preset fast -y "$out"

  It works mostly, but the problem is that I get a black video, with the same length then the main video, on the 3rd place. Interesting is also, when I watch the ffmpeg process, it hangs shortly on time 1:26min and then it jumps to 2:40min. Normally the complete test video have around 1:30min.

  The output what I get is at the moment :

  ([intro][trimmed main with logo][black video][outro][credits]) <- the black video part is to much.

• Does ffmpeg now natively support DTS-HD decoding ?

  20 octobre 2017, par Tom Arrow

  I know there used to be a —enable-libdcadec switch, but the newest builds available on ffmpeg.org don’t have it enabled.

  Also, DTS-HD is listed in the available decoders list.

  Also, I’ve seen some commit from not long ago that said "Remove libdcadec, we already have it merged internally"

  Also, I do get different results depending on whether I try to decode dtshd or dts files. (encoded directly to flac 5.1)

  So, any official statement on this ? Can I trust this ?

• How install ffmpeg on wamp server (windows 7 - x64)

  15 avril 2015, par MoonLight

  Please take a look at all these depricated links :
  http://stackoverflow.com/search?q=Install+ffmpeg+in+windows

  i installed wamp server on my windows 7 (x64) machine and want to install ffmpeg on it.

  here is my wamp server version :
  wampserver2.5-Apache-2.4.9-Mysql-5.6.17-php5.5.12-64b

  

  here is the official web site of ffmpeg :
  http://ffmpeg-php.sourceforge.net/

  i am really confused where can i download ffmpeg extension for php5.5.12 and how install it ?
  in their official web site there is only one link for download :
  http://sourceforge.net/projects/ffmpeg-php/

  and those downloaded files need perl to run and there is no dll files inside them.
  would be really appreciate to help me step by step to install ffmpeg in my wamp server.