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• FFMPEG for Android - missing alsa format

  24 août 2012, par user1545779

  @rowntreerob has an android-ffmpeg implementation that build successfully using the default file settings.

  When you remove disble-avdevice and disbale-devices from the configure_ffmpeg script, ndk-build fails. The following is the error message :

  CP ffmpeg
  STRIP ffmpeg
   /android-ffmpeg/Project/jni
   /android-ffmpeg/Project/jni
   /android-ffmpeg/Project/jni
  jasongipsyblues@android-master : /android-ffmpeg/Project/jni$ ndk-build
  Compile thumb : ffmpeg <= ffmpeg.c
  Compile thumb : ffmpeg <= cmdutils.c
  Executable : ffmpeg
  /home/jasongipsyblues/android-ffmpeg/Project/obj/local/armeabi- >v7a/objs/ffmpeg/ffmpeg/ffmpeg.o : In function `main' :

  /home/jasongipsyblues/android-ffmpeg/Project/jni/ffmpeg/ffmpeg.c:6130 : undefined >reference to `avdevice_register_all'
  

  /home/jasongipsyblues/android-ffmpeg/Project/obj/local/armeabi- >v7a/objs/ffmpeg/ffmpeg/cmdutils.o : In function `print_all_libs_info' :

  /home/jasongipsyblues/android-ffmpeg/Project/jni/ffmpeg/cmdutils.c:639 : undefined >reference to `avdevice_configuration'

  /home/jasongipsyblues/android-ffmpeg/Project/jni/ffmpeg/cmdutils.c:639 : undefined >reference to `avdevice_version'
  
  collect2 : ld returned 1 exit status

  make : ** [/home/jasongipsyblues/android-ffmpeg/Project/obj/local/armeabi-v7a/ffmpeg] >Error 1

  Please pardon my poor formating skills, I still dont get the formating thing. It appears the deletion of the references is to avdevices is definitely affecting the use of ndk-build.

  All the alsa source files exist in the ffmpeg code. How does one build ffmpeg in such a way that alsa is included in the formats ?

• Drawtext, drawbox or overlay on only a single frame using FFmpeg

  10 juillet 2013, par waxical

  I'm using the drawtext and drawbox avfilters on FFmpeg, two of the most poorly documented functions known to man.

  I'm struggling to work out if and how I can use them on only a single frame, i.e., drawtext on frame 22.

  Current command :

  ffmpeg -i test.wmv -y -b 800k -f flv -vcodec libx264 -vpre default -s 768x432 \
  
    -g 250 -vf drawtext="fontfile=/home/Cyberbit.ttf:fontsize=24:text=testical:\
  
    fontcolor=green:x=100:y=200" -qscale 8 -acodec libfaac -sn -vstats out.flv

  Two elements mentioned in the documentation are n and t. However, I only seem to be able to use them in x and y. Not in text or even as other parameters.

  Any help or FFmpeg guidance would be gratefully received.

• FFmpeg/libavcodec failing for asv1 conversion using PHPVideoToolkit

  24 juillet 2012, par clrockwell

  It seems that I can not get libavcodec running with my install of ffmpeg. I say 'it seems' because the searching I have done based on the following error message has gotten me to that point :

  PHPVideoToolkit Error : Execute error. Output for file "/home/clrock/public_html/drupal-7.14/sites/default/files/img/videos/original/StoryboardMovie.mp4" was found, but the file contained no data. Please check the available codecs compiled with FFmpeg can support this type of conversion. You can check the encode decode availability by inspecting the output array from PHPVideoToolkit::getFFmpegInfo().

  The ffmpeg command is

  /usr/local/bin/ffmpeg \
  
  -i '/home/clrock/public_html/drupal-7.14/sites/default/files/img/videos/original/StoryboardMovie.mp4' \
  
  -strict experimental -vcodec 'asv1' -s '640x480' -acodec 'aac' -ac '2'  \
  
  /tmp/1343067407-500d950fbd290.3gp

  I can not seem to find out how to get ffmpeg to configure with libavcodec. It seems all of the necessary files are there in /usr/src/ffmpeg-0.7.12/libavcodec.

  ffmpeg can make mp4 and flv files fine, only when using asv1 does it hang up.