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• Fast seeking ffmpeg multiple times for screenshots

  7 mars 2017, par user3786834

  I have come across http://askubuntu.com/questions/377579/ffmpeg-output-screenshot-gallery/377630#377630, it’s perfect. That has done exactly what I wanted.

  However, I’m using remote URLs to generate the screenshot timeline. I do know it’s possible to fast seek with remote files using https://trac.ffmpeg.org/wiki/Seeking%20with%20FFmpeg (using -ss before the -i) but this only runs the once.

  I’m looking for a way to use the

  ./ffmpeg -i input -vf "select=gt(scene\,0.4),scale=160:-1,tile,scale=600:-1" \
  
  -frames:v 1 -qscale:v 3 preview.jpg

  command but using the fast seek method as it’s currently very slow when used with a remote file. I use PHP but I am aware that a C method exists by using av_seek_frame, I barely know C so I’m unable to implement this into a PHP script I’m writing. So hopefully, it is possible to do this directly with ffmpeg in the PHP system() function.

  Currently, I run seperate ffmpeg commands (with the -ss method) and then combine the screenshots together in PHP. However, with this method it will be refetching the metadata each time and a more optimized method would be to have it all happen in the same command line because I want to reduce the amount of requests made to the remote url so I can run more scripts in sequence with each other.

  Thank you for your help.

• why doesn't ffmpeg name files with sequence after using strftime ?

  5 décembre 2016, par user2030856

  I would like to know why ffmpeg stops naming my files with a sequence number (%03d) when using -strftime 1 ?

  for example : filename_%Y-%m-%d_%03d.ts

  I need to get filename_YEAR_MONTH_DAY_SEQUENCE#.ts

  references :
  What do the special characters in an ffmpeg file output format mean ?
  ffmpeg filename output format
  http://man7.org/linux/man-pages/man3/strftime.3.html
  http://en.wikibooks.org/wiki/FFMPEG_An_Intermediate_Guide/image_sequence

• issue with ffmpeg config

  4 janvier 2015, par ali raha

  a ffmpeg was installed in my server but it no support some liberary like libvpx
  (centos 6.5)
  I couldn’t uninstall it but I install I new one with this tutorial :
  http://wiki.razuna.com/display/ecp/FFMpeg+Installation+on+CentOS+and+RedHat#FFMpegInstallationonCentOSandRedHat-InstallLibvpx

  (all configs in ffmpeg seems install correctly)

  PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig"
  
  export PKG_CONFIG_PATH
  
  ./configure --prefix="$HOME/ffmpeg_build" --extra-cflags="-I$HOME/ffmpeg_build/include" --extra-ldflags="-L$HOME/ffmpeg_build/lib" --bindir="$HOME/bin" \ 
  
  --extra-libs=-ldl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvpx --enable-libfaac \
  
  --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libvo-aacenc --enable-libxvid --disable-ffplay \
  
  --enable-gpl --enable-postproc --enable-nonfree --enable-avfilter --enable-pthreads 

  So I want to test it :

  I try test it with :

   #ffmpeg

  result :

  

  It seems related with older ffmpeg that was install.
  no change and no lib add !