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Mot : - Tags -/mp3

Autres articles (9)

  • Encoding and processing into web-friendly formats

    13 avril 2011, par

    MediaSPIP automatically converts uploaded files to internet-compatible formats.
    Video files are encoded in MP4, Ogv and WebM (supported by HTML5) and MP4 (supported by Flash).
    Audio files are encoded in MP3 and Ogg (supported by HTML5) and MP3 (supported by Flash).
    Where possible, text is analyzed in order to retrieve the data needed for search engine detection, and then exported as a series of image files.
    All uploaded files are stored online in their original format, so you can (...)

  • Keeping control of your media in your hands

    13 avril 2011, par

    The vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
    While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
    MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
    MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...)

  • Other interesting software

    13 avril 2011, par

    We don’t claim to be the only ones doing what we do ... and especially not to assert claims to be the best either ... What we do, we just try to do it well and getting better ...
    The following list represents softwares that tend to be more or less as MediaSPIP or that MediaSPIP tries more or less to do the same, whatever ...
    We don’t know them, we didn’t try them, but you can take a peek.
    Videopress
    Website : http://videopress.com/
    License : GNU/GPL v2
    Source code : (...)

Sur d’autres sites (3735)

  • Video conversion with ffmpeg to target Android and iOS mobile devices

    17 novembre 2017, par Lee Brindley

    I’m building a react native app for both Android and IOS, the back-end API is written with NodeJS.

    Users may upload video from their phones, once uploaded the user and their friends will be able to view the video - so the videos need to be stored in a format which is playable on both Android & IOS.

    My question relates to the conversion of video, uploaded by the user. I developed a similar app a couple of years ago ; I used the repo node-fluent-ffmpeg which provides a nice API to interact with FFmpeg.

    In the previous project (which was a web app), I converted the uploaded videos into two files, one .mp4 and one .webm - if a user uploaded an mp4, then I would skip the mp4 step, likewise if they uploaded a .webm.

    This was kind of slow. Now I’ve come across the same requirement years later, after some research I think I was wrong to convert the videos to the last project.

    I’ve read that I can simply use FFmpeg to change the container format of the videos, which is a much faster process than converting them from scratch.

    The video conversion code I used last time went something along the lines of :

    var convertVideo = function (source, format, output, success, failure, progress) {
    

    
    var converter = ffmpeg(source);
    

    
    var audioCodec = "libvorbis";
    

    
    if (format.indexOf("mp4") != -1) {
    
        audioCodec = "aac";
    
    }
    

    
    converter.format(format)
    
        .withVideoBitrate(1024)
    
        .withAudioCodec(audioCodec)
    
        .on('end', success)
    
        .on('progress', progress)
    
        .on('error', failure);
    

    
    converter.save(output);
    
};

    Usage :

    Convert to mp4 :

    convertVideo("PATH_TO_VIDEO", "mp4", "foo.mp4", () => {console.log("success");});

    Convert to webm :

    convertVideo("PATH_TO_VIDEO", "webm", "foo.webm", () => {console.log("success");});

    Can anyone point out a code smell here regarding the performance of this operation ? Is this code doing a lot more than it should achieve cross-platform compatibility between IOS and Android ?

    Might be worth mentioning that support for older OS versions is not such a big deal in this project.

  • 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 ?

  • aac-eld decode linux

    28 février 2013, par bernard

    I'm was in Vietnam and tried to learn Vietnames.
    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 try 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 ?

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