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• Compiling ffmpeg (-3.0) on windows 7 with nvenc

  21 février 2016, par aviyaChe

  I’m trying to compile ffmpeg (version 3.0) with the following configuration :

  ./configure --prefix=ffmpeg/ --disable-yasm --enable-nonfree --enable-nvenc

  But I get the following error :

  ERROR: nvEncodeAPI.h not found. 

  I download the latest Nvidia video SDK (version 6.0.1), but I don’t know where to copy the nvEncodeAPI.h file.

  I have the following set up :

  • windows 7 64 bit
  • cygwin64 terminal
  • Nvidia Quadro k4200, with driver 361.91

• Windows Ffmpeg - send audio to sound card's output

  30 mars 2021, par halitsafa

  I have a sound card (Behringer UMC202HD) which connected to a Windows 10 computer by usb cable, i am able to recieve audio from input device with the following ffmpeg command :
ffmpeg -f dshow -i audio="IN 1-2 (BEHRINGER UMC 202HD 192k)" -map_channel 0.0.0 -c:a pcm_s24le first_channel.wav -map_channel 0.0.1 -c:a pcm_s24le second_channel.wav

  


  But i can't send audio to sound card's output with the ffmpeg, is there any way to do this ? if there is, how can i do it ?

  


  Linux version (pseudo command) of what i'm trying to do in Windows :

  


  ffmpeg -i my_input.wav -f alsa alsa.behringer_out

  


• set variable and call result during FOR loop ; batch script windows

  19 juin 2018, par Doons

  I have read several posts here on Stackoverflow about binding a variable during a FOR loop. While I figure most of the help provided here has been for Linux/Unix, I’m reaching out for help with batch scripting in Windows. My main goal is to extract the "date created" from a mp4-file and "overlay the date on my video" using ffmpeg (and or ffprobe).

  I have experimented a lot, but my latest attempt has been trying to bind the result from ffprobe onto a variable, and use the variable later. My latest and simplest attempt looks like this :

  SETLOCAL ENABLEDELAYEDEXPANSION
  
  for %%a in ("*.mp4") do (
  
  for /F "tokens=*" %%G in ('ffprobe -v quiet %%a -print_format compact -show_entries format_tags=creation_time') do (
  
  set DateC=%%G
  
  echo !DateC!)
  
  )

  I was hoping to be able to print the tag result from ffprobe using that code, but apparently not. So helping me bind that variable, and how to call it again later inside the following code snippet in Windows, would be deeply appreciated :

   ffmpeg -i %%a -filter_complex "drawtext=fontfile=/Windows/Fonts/Arial.ttf:x=28:y=650:fontsize=45:fontcolor=white:box=1:boxcolor=black@0.4:text='!DateC!'" -c:a copy output.mp4

  I must also mention I’ve seen the following code on StackOverflow :

   ffmpeg -i %%a -filter_complex "drawtext=fontfile=/Windows/Fonts/Arial.ttf:x=28:y=650:fontsize=45:fontcolor=white:box=1:boxcolor=black@0.4:text='%{metadata\:creation_time}'" -c:a copy output.mp4

  But I have the same problem making Windows recognize and print the metadata.

  I am certain the file in question contains this metadata.