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• ffplay : reorder the filters to ensure that inputs of the custom filters are merged...

  29 janvier 2014, par Marton Balint

  ffplay : reorder the filters to ensure that inputs of the custom filters are merged first
  For more info see http://ffmpeg.org/pipermail/ffmpeg-user/2013-December/018761.html
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] ffplay.c

• aac-eld decoding in Linux

  7 mars 2013, par bernard

  I was in Vietnam and tried to learn Vietnamese.

  The difficult thing is to learn the pronunciation and I made an Android App to record voices. Vietnamese people are very nice and I collected more than 500 sound files.

  Now I'm trying to make a language learning app. To do that I try to reduce noise and normalize volume.

  I have chosen the following settings :

  this.recorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
  
  this.recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC_ELD);
  
  this.recorder.setAudioEncodingBitRate(96000);
  
  this.recorder.setAudioSamplingRate(44100);

  (cordova AudioPlayer.java - default settings are crap)

  Now I have a problem. I'm not able to open the files with Audacity or FFmpeg.

  ./ffmpeg -i /tmp/speaker__ualp__x%E1%BA%A5u.mp4 /tmp/uu.wav
  
  ffmpeg version 1.1.2 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Feb 20 2013 10:50:54 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  
    configuration: --enable-libfdk-aac
  
    libavutil      52. 13.100 / 52. 13.100
  
    libavcodec     54. 86.100 / 54. 86.100
  
    libavformat    54. 59.106 / 54. 59.106
  
    libavdevice    54.  3.102 / 54.  3.102
  
    libavfilter     3. 32.100 /  3. 32.100
  
    libswscale      2.  1.103 /  2.  1.103
  
    libswresample   0. 17.102 /  0. 17.102
  
  [aac @ 0xaada980] Audio object type 39 is not supported.
  
      Last message repeated 1 times
  
  Guessed Channel Layout for  Input Stream #0.0 : mono
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/tmp/speaker__ualp__x%E1%BA%A5u.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 0
  
      compatible_brands: isom3gp4
  
      creation_time   : 2013-01-29 15:53:11
  
    Duration: 00:00:01.21, start: 0.000000, bitrate: 116 kb/s
  
      Stream #0:0(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 96 kb/s
  
      Metadata:
  
        creation_time   : 2013-01-29 15:53:11
  
        handler_name    : SoundHandle
  
  [aac @ 0xaada980] Audio object type 39 is not supported.
  
  Output #0, wav, to '/tmp/uu.wav':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 0
  
      compatible_brands: isom3gp4
  
      Stream #0:0(eng): Audio: pcm_s16le, 44100 Hz, mono, s16, 705 kb/s
  
      Metadata:
  
        creation_time   : 2013-01-29 15:53:11
  
        handler_name    : SoundHandle
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (aac -> pcm_s16le)
  
  Error while opening decoder for input stream #0:0

  What can I do ?

• How do i convert a transparent .mov-file to an mp4 file overlayed on a background-image using FFMPEG [migrated]

  5 mars 2013, par Ernie

  I'm trying to convert a mov file with the following specs :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mov':
  
  Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537199360
  
      compatible_brands: qt  
  
      creation_time   : 2012-10-09 13:34:01
  
  Duration: 00:00:51.60, start: 0.000000, bitrate: 217433 kb/s
  
      Stream #0:0(eng): Video: prores (ap4h / 0x68347061), yuv444p10le, 1920x1080, 215844 kb/s, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 25 tbn, 25 tbc
  
      Metadata:
  
          creation_time   : 2012-10-09 13:34:01
  
          handler_name    : Apple Alias Data Handler
  
          timecode        : 01:00:00:00
  
      Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, stereo, s16, 1536 kb/s
  
      Metadata:
  
          creation_time   : 2012-10-09 13:34:01
  
          handler_name    : Apple Alias Data Handler
  
      Stream #0:2(eng): Data: none (tmcd / 0x64636D74)
  
      Metadata:
  
          creation_time   : 2012-10-09 13:42:30
  
          handler_name    : Apple Alias Data Handler
  
          timecode        : 01:00:00:00

  I want a background-image with that video on top of it and save it as an mp4-file. In the meantime the video has to be scaled and cropped
  I need a solution which can be automated and placed on a server, that is why i tried ffmpeg

  This is wat have at the moment :

  ffmpeg -loop 1 -f image2 -i background.png -r 25 -an -vcodec libx264 -b:v 1500k -vf "movie=test.mov[movie];[movie]scale=max(552\, 420*iw/ih):-1[OUT1]; [OUT1]crop=552:420[OUT2]; [0][OUT2] overlay=0:0 [out]" -s 552x420 -y output.mp4

  The problem is, somehow, the transparency is lost, and the background is black, instead of the underlying image. When i try the same ffmpeg command with a transparent FLV as input, it works, but i would like it to work without having to convert al source files first to another format

  Any help with this would be greatly appreciated !

  This is my current ffmpeg configuration :

  ffmpeg version 1.1.2 Copyright (c) 2000-2013 the FFmpeg developers
  
  built on Mar  4 2013 11:19:29 with Apple clang version 4.1 (tags/Apple/clang-421.11.66) (based on LLVM 3.1svn)
  
  configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libspeex --enable-libfreetype --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid --enable-nonfree --enable-libfaac
  
      libavutil      52. 13.100 / 52. 13.100
  
      libavcodec     54. 86.100 / 54. 86.100
  
      libavformat    54. 59.106 / 54. 59.106
  
      libavdevice    54.  3.102 / 54.  3.102
  
      libavfilter     3. 32.100 /  3. 32.100
  
      libswscale      2.  1.103 /  2.  1.103
  
      libswresample   0. 17.102 /  0. 17.102
  
      libpostproc    52.  2.100 / 52.  2.100