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• How to extract images from webm video using ffmpeg

  23 octobre 2013, par Angelo N.

  I need to extract a set of images from a webm video using ffmpeg (version 0.9.2).
  I currently use this script :

  ./ffmpeg -i video.webm -r 1 -f image2 image-%04d.jpg

  but I have this error

  ffmpeg version 0.9.2, Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Oct 23 2013 12:18:47 with gcc 4.6.3
  
    configuration: --extra-libs=-ldl --disable-shared --enable-static --disable-everything --disable-ffplay --disable-ffprobe --disable-ffserver --disable-avfilter --disable-avdevice --enable-libvpx --enable-protocol=file --enable-encoder=mjpeg --enable-encoder=libvpx --enable-decoder=libvpx --enable-decoder=mjpeg --enable-parser=mjpeg --enable-muxer=webm --enable-muxer=image2 --enable-muxer=mjpeg --enable-muxer=avi --enable-demuxer=image2 --enable-demuxer=mjpeg --enable-demuxer=avi
  
    libavutil    51. 32. 0 / 51. 32. 0
  
    libavcodec   53. 42. 4 / 53. 42. 4
  
    libavformat  53. 24. 2 / 53. 24. 2
  
    libswscale    2.  1. 0 /  2.  1. 0
  
  /home/username/Desktop/out.webm: Invalid data found when processing input

  I found that in ffmpeg there isn't a webm demuxer and you can check it typing

  ./configuration --list-demuxers

  So I'm asking why ffmpeg do not support a webm demuxer which is used by libvpx (used for example in youtube by Google) .

  It sounds strange... doesn't it ?

• PHP and FFmpeg : works on terminal but ffmpeg error when in shell_exec

  25 janvier 2014, par user2128983

  I'm in front of a problem I can't solve !

  I try to convert videos using the ffmpeg tool. When I paste the command on the server terminal (ssh root), it works fine. But, when I try in my PHP script using shell_exec, it returns the error "Error while opening encoder ...".

  Here is the command I use :

  ffmpeg -y -i VIDEOIN.mov -preset medium -strict -2 -c:v libx264 -b:v 1000k -pass 1 -f mp4 VIDEOOUT.mp4 null 1>logfile.txt 2>&1 &

  And my PHP script :

  $dir = 'videos/'.$uuid;
  
  $out = $dir.'video.mp4';
  
  $log = $dir.'transcoding_log.txt';
  
  $preset = 'medium';
  
  $bitrate = 1000;
  
  
  
  $cmd = "ffmpeg -y -i ".$in." -preset ".$preset." -strict -2 -c:v libx264 -b:v ".$bitrate."k -pass 1 -f mp4 ".$out." null 1>".$log." 2>&1 &";
  
  @file_put_contents($dir.'cmd.log', $cmd); // to debug
  
  shell_exec($cmd);

  Here is the log file created in the PHP script :

  ffmpeg version 1.0.8 Copyright (c) 2000-2013 the FFmpeg developers
  
  built on Sep 12 2013 11:57:09 with gcc 4.7 (Debian 4.7.2-5)
  
  configuration: --prefix=/usr --extra-cflags='-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security ' --extra-ldflags='-Wl,-z,relro' --cc='ccache cc' --enable-shared --enable-libmp3lame --enable-gpl --enable-nonfree --enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-x11grab --enable-libgsm --enable-libtheora --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-libspeex --enable-nonfree --disable-stripping --enable-libvpx --enable-libschroedinger --disable-encoder=libschroedinger --enable-version3 --enable-libopenjpeg --enable-librtmp --enable-avfilter --enable-libfreetype --enable-libvo-aacenc --disable-decoder=amrnb --enable-libvo-amrwbenc --enable-libaacplus --libdir=/usr/lib/x86_64-linux-gnu --disable-vda --enable-libbluray --enable-libcdio --enable-gnutls --enable-frei0r --enable-openssl --enable-libass --enable-libopus --enable-fontconfig --enable-libfdk-aac --enable-libdc1394 --disable-altivec --dis  libavutil      51. 73.101 / 51. 73.101
  
    libavcodec     54. 59.100 / 54. 59.100
  
    libavformat    54. 29.104 / 54. 29.104
  
    libavdevice    54.  2.101 / 54.  2.101
  
    libavfilter     3. 17.100 /  3. 17.100
  
    libswscale      2.  1.101 /  2.  1.101
  
    libswresample   0. 15.100 /  0. 15.100
  
    libpostproc    52.  0.100 / 52.  0.100
  
  Input #0, matroska,webm, from 'videos/18352678af96ecb5/origin.webm':
  
    Metadata:
  
      creation_time   : 2010-05-20 08:21:12
  
    Duration: 00:00:32.48, start: 0.000000, bitrate: 533 kb/s
  
      Stream #0:0(eng): Video: vp8, yuv420p, 640x360, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 1k tbn, 1k tbc (default)
  
      Stream #0:1(eng): Audio: vorbis, 44100 Hz, mono, s16 (default)
  
  [libx264 @ 0x19c05a0] using SAR=1/1
  
  [libx264 @ 0x19c05a0] using cpu capabilities: MMX2 SSE2Fast SSEMisalign LZCNT
  
  [libx264 @ 0x19c05a0] ratecontrol_init: can't open stats file
  
  Output #0, mp4, to 'videos/18352678af96ecb5/video.mp4':
  
      Stream #0:0(eng): Video: h264, yuv420p, 640x360 [SAR 1:1 DAR 16:9], q=-1--1, pass 1,     90k tbn, 25 tbc (default)
  
      Stream #0:1(eng): Audio: none, 44100 Hz, mono, s16, 128 kb/s (default)
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (vp8 -> libx264)
  
    Stream #0:1 -> #0:1 (vorbis -> libfaac)
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as     bit_rate, rate, width or height

  EDIT 1 :

  I compiled ffmpeg with the latest revision but the problem still occurs.

• Revision 820201caa8 : vp9_thread : add vp9_worker_execute() cherry-picked from : commit 988b70844e03efc

  16 octobre 2013, par James Zern

  Changed Paths :
   Modify /test/vp9_thread_test.cc

  
   Modify /vp9/decoder/vp9_thread.c

  
   Modify /vp9/decoder/vp9_thread.h

  
  
  vp9_thread : add vp9_worker_execute()

  cherry-picked from :
  commit 988b70844e03efcfcc075a9bc25d846670494f36
  Author : Pascal Massimino <pascal.massimino@gmail.com>
  Date : Fri Aug 2 11:15:16 2013 -0700

  add WebPWorkerExecute() for convenient bypass

  This is mainly for re-using the worker structs without using the
  thread.

  Change-Id : I8e1be29e53874ef425b15c192fb68036b4c0a359

  Original source :
  http://git.chromium.org/webm/libwebp.git
  100644 blob c0d318aee628fdf9ba4876451a28aa978f1066b8 src/utils/thread.c
  100644 blob c2b92c9fe353f8e514f78922f3d237204a9cbc66 src/utils/thread.h

  Change-Id : I13fe92b1e94062bb99fdeeb7cb0b4b0575d27793