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• Add image or photo in the background of .3gp file

  17 août 2014, par psouza

  I have an android app that records audio in 3gp format. Audio is recorded successfully and the file created.

  I would add at least an image file to 3gp created but without using external libraries like ffmpeg, javacv as they leave the app created over 10MB in size.

  Basically what I would like is information and sources about what search to add images to the background of my files 3gp audio libraries created without weighing the size of my apps.

  Thank you

• ffmpeg usage - quad core still overloaded

  29 juillet 2012, par thevoipman

  I have a 3.2GHz Quad Core Xeon E3-1230 CPU, Passmark CPU mark Score of 8,200, 32GB ram - and I can't do more than 4 ffmpeg commands/sessions without being overloaded. When I execute a ffmpeg session, it's telling me that it's not using muliple cores, only one. Why is that ? How can I get ffmpeg to fully use all the cpu cores I have ?

  Thank you in advance for any kind of suggestions.

  ffmpeg version :

  ffmpeg version N-42487-gfedefe4-syslint Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Jul 13 2012 23:18:33 with gcc 4.1.2 20080704 (Red Hat 4.1.2-52)
  
    configuration: --prefix=/usr/local/cpffmpeg --enable-shared --enable-nonfree --enable-gpl --enable-pthreads --enable-libopencore-amrnb --enable-decoder=liba52 --enable-libopencore-amrwb --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --extra-cflags=-I/usr/local/cpffmpeg/include/ --extra-ldflags=-L/usr/local/cpffmpeg/lib --enable-version3 --extra-version=syslint
  
    libavutil      51. 64.100 / 51. 64.100
  
    libavcodec     54. 37.100 / 54. 37.100
  
    libavformat    54. 16.104 / 54. 16.104
  
    libavdevice    54.  1.100 / 54.  1.100
  
    libavfilter     3.  2.100 /  3.  2.100
  
    libswscale      2.  1.100 /  2.  1.100
  
    libswresample   0. 15.100 /  0. 15.100
  
    libpostproc    52.  0.100 / 52.  0.100
  
  Hyper fast Audio and Video encoder

• Converting any video to iPhone - transcoding logic/algorithm ?

  28 septembre 2012, par cajwine

  I have many-many video files in different formats (mostly avi). For example, some relevant lines from ffprobe :

    Duration: 02:27:14.70, start: 0.000000, bitrate: 664 kb/s
  
      Stream #0.0: Video: mpeg4, yuv420p, 608x256 [PAR 1:1 DAR 19:8], 23.98 tbr, 23.98 tbn, 23.98 tbc
  
      Stream #0.1: Audio: mp3, 44100 Hz, stereo, s16, 96 kb/s
  
  
  
    Duration: 00:20:51.84, start: 0.000000, bitrate: 3286 kb/s
  
      Stream #0.0: Video: mpeg4, yuv420p, 640x480 [PAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
  
      Stream #0.1: Audio: mp3, 48000 Hz, stereo, s16, 128 kb/s
  
  
  
    Duration: 01:26:01.84, start: 0.000000, bitrate: 845 kb/s
  
      Stream #0.0: Video: mpeg4, yuv420p, 704x544 [PAR 1:1 DAR 22:17], 25 fps, 25 tbr, 25 tbn, 30k tbc
  
      Stream #0.1: Audio: mp3, 44100 Hz, stereo, s16, 128 kb/s
  
  
  
    Duration: 01:42:25.68, start: 0.000000, bitrate: 952 kb/s
  
      Stream #0.0: Video: h264 (High), yuv420p, 600x244 [PAR 1:1 DAR 150:61], 25 fps, 25 tbr, 25 tbn, 50 tbc
  
      Stream #0.1: Audio: mp3, 48000 Hz, stereo, s16, 112 kb/s

  As you can see, the bitrates, video-sizes, codecs are vary. Want write a script (bash, perl) what will convert them for iPhone with ffmpeg.

  With googling i found many different ffmpeg profiles, but all profiles are "static", e.g. converts video to same resolution and this is probably not the right way, because i have many different video resolutions with many different bitrates. (this applies for the audio too).

  I'm able write the script - but need help with one basic question.

  I need help with the algorithm how to calculate the values for ffmpeg arguments from the above ffprobe results. E.g. when have video 704x544 and 845kb/s and another video with smaller size 640x480 but 3200kb/s bitrate - how to calculate the "right values" for ffmpeg in the script ?

  What is right algorithm/logic for transcoding video for the desired device ? (in my case iPhone)

  If someone care, I have ffmpeg recompiled with "nonfree" codecs, and have mencoder (from mplayer package) too.

  Second : In the avi containers are many videos already in the mpeg4 format. How to determine the "fastest" converting profile ? Mean a profile, where ffmpeg will only do the less-possible calculations, so probably will leave as-is : the format mpeg4, the size, the bitrate and "only" will change the container format. Is this possible ?

  I was read many ffmpeg SO questions, but not find answers - maybe I missed something. Can somebody point me to some good documents ?