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  • 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 (...)

  • Creating farms of unique websites

    13 avril 2011, par

    MediaSPIP platforms can be installed as a farm, with a single "core" hosted on a dedicated server and used by multiple websites.
    This allows (among other things) : implementation costs to be shared between several different projects / individuals rapid deployment of multiple unique sites creation of groups of like-minded sites, making it possible to browse media in a more controlled and selective environment than the major "open" (...)

  • Ajouter notes et légendes aux images

    7 février 2011, par

    Pour pouvoir ajouter notes et légendes aux images, la première étape est d’installer le plugin "Légendes".
    Une fois le plugin activé, vous pouvez le configurer dans l’espace de configuration afin de modifier les droits de création / modification et de suppression des notes. Par défaut seuls les administrateurs du site peuvent ajouter des notes aux images.
    Modification lors de l’ajout d’un média
    Lors de l’ajout d’un média de type "image" un nouveau bouton apparait au dessus de la prévisualisation (...)

Sur d’autres sites (4354)

  • FFMPEG (Input 8K AAC -> (AAC FLV) youtube streaming noise

    17 septembre 2017, par Biswa Das

    Hello I run a streaming encoder for a non profit cause. Chosen FFMPEG as it’s very simple and doing the job near perfectly however the audio is noisy popping and cracking. Video is crystal clear.

    ffmpeg version N-86950-g1bef008 Copyright (c) 2000-2017 the FFmpeg developers
    built with gcc 7.1.0 (GCC)

    Here is my command.

    ffmpeg -rtsp_transport tcp -i $RTSP_SRC -vcodec copy -af "volume=12dB" -ar 8000 -acodec aac -f flv rtmp://a.rtmp.youtube.com/live2/$DEST_KEY

    However when I just play the stream the noise levels are quite acceptable.

    ffplay -rtsp_transport tcp -i $RTSP_SRC

    What I have tried so far.

    • Change input audio sampling from 8K to 16K (that’s all is supported currently). It made the noise problem much worse. I can’t change it to a native FLV sampling(44100 or 22050 or 11025) at least not yet, the integrated rtsp stream does not support it.)
    • My working theory is during resampling stream noise is getting boosted. So to eliminate that I tried audio copy codec even then there is no significant improvement.

  • ffmpeg resample to flac loud clicks/noise

    4 août 2017, par Sjoerd Staal

    I’m using the ffmpeg-api to resample a DSD file to Flac & mp3. I don’t experience any problems with the mp3 resample, but with the flac resample there is always a loud click at the end of a track.

    I’m using the FFMpeg API which outputs the following command in command line :

    ffmpeg -i input.dsf -ar 192000 -acodec flac output.flac

    Output :

    ffmpeg version 2.8.5 Copyright (c) 2000-2016 the FFmpeg developers
    
  built with Apple LLVM version 7.0.2 (clang-700.1.81)
    
  configuration: --prefix=/usr/local/Cellar/ffmpeg/2.8.5 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-opencl --enable-libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid --enable-vda
    
  libavutil      54. 31.100 / 54. 31.100
    
  libavcodec     56. 60.100 / 56. 60.100
    
  libavformat    56. 40.101 / 56. 40.101
    
  libavdevice    56.  4.100 / 56.  4.100
    
  libavfilter     5. 40.101 /  5. 40.101
    
  libavresample   2.  1.  0 /  2.  1.  0
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  2.101 /  1.  2.101
    
  libpostproc    53.  3.100 / 53.  3.100
    
[mjpeg @ 0x7fe617809000] Changeing bps to 8
    
[dsf @ 0x7fe617000000] Estimating duration from bitrate, this may be inaccurate
    
Input #0, dsf, from 'input.dsf':
    
  Metadata:
    
    title           : Bach Brandenburg no. 6 - Allegro
    
    artist          : Florilegium
    
    album           : Brandenburg Concertos
    
    track           : 3
    
    Tool Version    : 18.0.212
    
    genre           : Classical
    
    composer        : Bach
    
    Catalog #       : 35914
    
    Format          : DSD
    
    ISRC            : NLA460912792
    
    Label           : Channel Classics
    
    Tool Name       : Media Center
    
    date            : 2014
    
  Duration: 00:06:00.31, bitrate: 5644 kb/s
    
    Stream #0:0: Audio: dsd_lsbf_planar, 352800 Hz, stereo, fltp, 5644 kb/s
    
    Stream #0:1: Video: mjpeg, yuvj444p(pc, bt470bg/unknown/unknown), 1429x1417 [SAR 300:300 DAR 1429:1417], 90k tbr, 90k tbn, 90k tbc
    
    Metadata:
    
      title           : Picture
    
      comment         : Cover (front)
    
[flac @ 0x7fe617122000] encoding as 24 bits-per-sample
    
Output #0, flac, to 'output.flac':
    
  Metadata:
    
    title           : Bach Brandenburg no. 6 - Allegro
    
    artist          : Florilegium
    
    album           : Brandenburg Concertos
    
    TRACKNUMBER     : 3
    
    Tool Version    : 18.0.212
    
    genre           : Classical
    
    composer        : Bach
    
    Catalog #       : 35914
    
    Format          : DSD
    
    ISRC            : NLA460912792
    
    Label           : Channel Classics
    
    Tool Name       : Media Center
    
    date            : 2014
    
    encoder         : Lavf56.40.101
    
    Stream #0:0: Audio: flac, 192000 Hz, stereo, s32 (24 bit), 128 kb/s
    
    Metadata:
    
      encoder         : Lavc56.60.100 flac
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (dsd_lsbf_planar (native) -> flac (native))
    
Press [q] to stop, [?] for help
    
size=  306541kB time=00:05:58.10 bitrate=7012.3kbits/s    
    
video:0kB audio:306532kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.002733%

  • avfilter : Add blue and violet noise generation filters

    19 juillet 2017, par George Boyle
    avfilter : Add blue and violet noise generation filters

    For the blue and violet noise, I took the pink and brown noise
    
respectively and subtracted the offsets instead of adding them. When I
    
eyeball the frequency spectrum of the resulting outputs it looks correct
    
to me, i.e. the blue graph appears to be a mirror image of the pink, and
    
the same can be said of the violet and the brown. I did not do anything
    
else to confirm the correctness.
    • [DH] doc/filters.texi
    • [DH] libavfilter/asrc_anoisesrc.c

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