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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 (...)

  • Contribute to documentation

    13 avril 2011

    Documentation is vital to the development of improved technical capabilities.
    MediaSPIP welcomes documentation by users as well as developers - including : critique of existing features and functions articles contributed by developers, administrators, content producers and editors screenshots to illustrate the above translations of existing documentation into other languages
    To contribute, register to the project users’ mailing (...)

  • 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 (...)

Sur d’autres sites (2422)

  • opusdsp : add ability to modify deemphasis constant

    29 janvier 2024, par Lynne
    opusdsp : add ability to modify deemphasis constant

    xHE-AAC relies on the same postfilter mechanism
    
that Opus uses to improve clarity (albeit with a steeper
    
deemphasis filter).
    

    The code to apply it is identical, it's still just a
    
simple IIR low-pass filter. This commit makes it possible
    
to use alternative constants.
    • [DH] libavcodec/aarch64/opusdsp_init.c
    • [DH] libavcodec/aarch64/opusdsp_neon.S
    • [DH] libavcodec/opusdec_celt.c
    • [DH] libavcodec/opusdsp.c
    • [DH] libavcodec/opusdsp.h
    • [DH] libavcodec/opusenc.c
    • [DH] libavcodec/opustab.c
    • [DH] libavcodec/opustab.h
    • [DH] libavcodec/x86/opusdsp.asm
    • [DH] libavcodec/x86/opusdsp_init.c
    • [DH] tests/checkasm/opusdsp.c

  • Is it possible to merge 3 videos with ffmpeg by -f concat and crossfade without video content

    10 août 2019, par user3792705

    I want to merge 3 .mov files quickly without losing any resolution. I want to be able to distinguish the 3 pieces of videos after merge.

    "ffmpeg -f concat" does not lose resolution and quick without crossfade.

    But, I can’t distinguish 3 videos.

    As far as I know ffmpeg filter can be used add crossfade, but it have to use video start/end content to do the merger, which might involve transcoding. It won’t be fast compared with ’concat’, which won’t do transcoding, but simply copying.

    Here is the content (ffmpeg -i video.mov) of one of 3 videos :

    ffmpeg version 4.1.3 Copyright (c) 2000-2019 the FFmpeg developers
    
  built with Apple LLVM version 10.0.1 (clang-1001.0.46.3)
    
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.3 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/openjdk-12.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/openjdk-12.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
    
  libavutil      56. 22.100 / 56. 22.100
    
  libavcodec     58. 35.100 / 58. 35.100
    
  libavformat    58. 20.100 / 58. 20.100
    
  libavdevice    58.  5.100 / 58.  5.100
    
  libavfilter     7. 40.101 /  7. 40.101
    
  libavresample   4.  0.  0 /  4.  0.  0
    
  libswscale      5.  3.100 /  5.  3.100
    
  libswresample   3.  3.100 /  3.  3.100
    
  libpostproc    55.  3.100 / 55.  3.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '..../(edited)/VMEK8375.MOV':
    
  Metadata:
    
    major_brand     : qt  
    
    minor_version   : 0
    
    compatible_brands: qt  
    
    creation_time   : 2019-06-30T01:28:04.000000Z
    
    com.apple.quicktime.model: iPhone
    
    com.apple.quicktime.software: ZHIYUN
    
    com.apple.quicktime.creationdate: 2019-06-30T09:28:04Z
    
  Duration: 00:00:07.61, start: 0.000000, bitrate: 4386 kb/s
    
    Stream #0:0(und): Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, smpte170m/bt709/bt709), 1280x720, 4329 kb/s, 30.01 fps, 30 tbr, 600 tbn, 600 tbc (default)
    
    Metadata:
    
      creation_time   : 2019-06-30T01:28:04.000000Z
    
      handler_name    : Core Media Video
    
      encoder         : HEVC
    
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 94 kb/s (default)
    
    Metadata:
    
      creation_time   : 2019-06-30T01:28:04.000000Z
    
      handler_name    : Core Media Audio

    If I don’t care about crossfade with video content, just some ’nice’ black screen in between (It would be nice I add some text, like date + time on the black screen) is good enough for me. Is it possible to do ’concat’ and simple crossfade without video ’content’ ?

  • How to modify SPS/PPS aka Codec Private data of a mkv file

    13 novembre 2019, par Minh Nghĩa

    I encode my clip in 5 parts (output is x265 in MKV), using -ss and -t to seek to cut position. Now mkvtoolnix refuses to merge the encoded files, warning that codec private data doesn't match.

    From this question in mkvtoolnix repo, I learned that the codec private data is encoded in PPS/SPS field of the file. I check the encoding settings from mediainfo, and found that all settings are the same, just one file has a different numa-pool argument. I think my files can still be merged.

    How can I edit SPS/PPS data to fool mkvmerge into merging my files ? Thanks !

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