Recherche avancée

Sur d’autres sites (6984)

• Cannot install Libtool library used but `LIBTOOL' is undefined trying to install ffmpeg

  23 décembre 2014, par user1503606

  I am trying to install ffmpeg on centos following this tutorial.

  http://ffmpeg.org/trac/ffmpeg/wiki/CentosCompilationGuide

  but when i run.

  cd ~/ffmpeg_sources
  
  git clone --depth 1 git://github.com/mstorsjo/fdk-aac.git
  
  cd fdk-aac
  
  autoreconf -fiv
  
  ./configure --prefix="$HOME/ffmpeg_build" --disable-shared
  
  make
  
  make install
  
  make distclean

  I get the following error.

  cd . && /bin/sh /root/ffmpeg_sources/fdk-aac/missing --run automake-1.9 --foreign
  
  Makefile.am: C objects in subdir but `AM_PROG_CC_C_O' not in `configure.ac'
  
  make: *** [Makefile.in] Error 1
  
  [root@worldnewstranslate fdk-aac]# make install
  
   cd . && /bin/sh /root/ffmpeg_sources/fdk-aac/missing --run automake-1.9 --foreign
  
  Makefile.am: C objects in subdir but `AM_PROG_CC_C_O' not in `configure.ac'
  
  make: *** [Makefile.in] Error 1

  I cannot get it to work for the life of me any help please why i maybe getting these errors.

  Thanks

• Tools for investigating video corruption — ffmpeg / libavcodec

  11 juillet 2013, par Gopherkhan

  In my current work I'm trying to encode some images to h264 video using the FFMPEG's C library. The resulting video plays fine in VLC, but has no preview image. The video can play in VLC and Mplayer on ubuntu, but won't play on Mac or PC (in fact, it causes a "VTDecoderXPCService quit unexpectedly" error on Mac).

  If I run the resulting file through FFMPEG using the command line, the resulting file has a preview image, and plays correctly everywhere.

  Apparently the file that I get out of the program is corrupt in some weird place, but I don't have any output during my compilation or run to indicate where. I can't share my code at the moment (work code isn't open source yet :-( ), but I have tried a number of things :

  1. Writing only header and trailer data (av_write_trailer) and no frames
  2. writing frames only minus the trailer (using avcodec_encode_video2 and av_write_frame)
  3. Adjusting our time_base and frame pts values to encode only one frame per second
  4. Removing all variable frame rate code
  5. Numerous other variants that I won't bother you with here

  In creating my project, I've also followed the following tutorials :

  • Dr. Anger's FFMPEG tutorial
  • FFmpeg's Own Tutorials
  • An older tutorial from FFmpeg

  And consulted the deprecated ffmpeg functions list

  And compiled FFMPEG on ubuntu according to the official doc

  But every run of the program runs into the exact same problem.

  My question is, is there anything obvious that causes a programmatic run of FFMpeg to differ from a console run (e.g., an incomplete finalization, some threading issues, etc.) ? Like some obvious reason that a console run could repair a corrupted file ? Or is there a decent tool/method for inspecting a video file and finding the point of corruption ?

• ffmpeg fast extraction of small segments

  17 juin 2016, par alr

  According to this this manual for fast extraction of small segments from video file you need to specify -ss parameter before -i.
  How efficiently split 70+ GB raw video file to, let say, 4 second segments ? Using the option specified above it works fine at the beginning, but then it becomes slower and slower. According to htop, the cache becomes full in Ubuntu 14.04 using ffmpeg 2.8.6, unless you have RAM bigger than the processed file.
  Is there a way to split raw video file which is bigger than the amount of RAM without slowing down ? It would be nice to use ffmpeg, because it allows to apply other filters on the fly.