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• Anomalie #4820 (Nouveau) : Double chargement des css

  10 juin 2021, par JLuc -

  Sur plusieurs sites SPIP, l’inspecteur de Firefox (de même que des outils d’analyse de la cascade des chargements http) révèle que la css compilée compactée est chargée 2 fois. Le fichier har joint présente la cascade de spip.net où ça se produit aussi.

  Serait ce pas dû à compresseur_ecrire_balise_css_dist() qui insère
  

  <span class="CodeRay">    <span class="local-variable">$comments</span> .= <span class="string"><span class="delimiter">"</span><span class="content">span><span class="delimiter">"</span></span> . (<span class="local-variable">$media</span> ? <span class="string"><span class="delimiter">"</span><span class="content"> media='</span><span class="local-variable">$media</span><span class="content">'</span><span class="delimiter">"</span></span> : <span class="string"><span class="delimiter">"</span><span class="delimiter">"</span></span>) . <span class="string"><span class="delimiter">"</span><span class="content"> href='</span><span class="local-variable">$src</span><span class="content">' type='text/css' /></span><span class="delimiter">"</span></span>;
      <span class="comment">// Envoyer aussi un entete http pour demarer le chargement de la CSS plus tot</span>
      <span class="comment">// Link: /href.here/to/resource.html>;rel="stylesheet prefetch" </span>
      <span class="local-variable">$comments</span> .= <span class="string"><span class="delimiter">"</span><span class="content">&lt;</span><span class="delimiter">"</span></span> . <span class="string"><span class="delimiter">"</span><span class="content">?php header('Link: &lt;' . url_de_base() . (_DIR_RACINE ? _DIR_RESTREINT_ABS : '') . '</span><span class="local-variable">$src</span><span class="content">>;rel=</span><span class="char">\"</span><span class="content">stylesheet prefetch</span><span class="char">\"</span><span class="content">'); ?></span><span class="delimiter">"</span></span>;
  </span></span>
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• Best approach to set up live video streaming between HoloLens2 and Desktop PC

  19 mai 2021, par SilverLife

  First of all, I am sorry for this question. I know its more asking for an advice than asking about any coding problems. Unfortunately I don´t know where else I should ask such a question, so please be patient. (I am open for any recommendations)

  


  Since a while I am searching for a promising approach to stream live videos from a desktop PC via network to my HoloLens 2 unity application. The video transfer should be within a encapsulated network without internet access. Therefore a direct connection between both devices without any signaling- or web-servers would be desirable, if possible. For now we are thinking about sending the stream via ffmpeg and receiving it somehow in the unity application.
So far I came across MixedReality-WebRTC and ffmpegInterop. Unfortunately as I read, WebRTC needs at least some kind of signaling server which manages the connection between the clients. ffmpegInterop seems to be really difficult to integrate into unity.

  


  I am completely new to the topic of low latency video streaming and a bit lost in this complex environment. Can anybody give me an advice about a promising and extendable way to receive a low latency video stream ?

  


• Add another audio over a file with mixed audio tracks in ffmpeg

  11 mars 2021, par Real Noob

  I have a file that was formed by concatenating three different files : a.mp4, b.mp4 and c.mp4.

  


  do ffmpeg -f concat -i "concat-file.txt" -map 0:v -map 0:a -c:v libx264 -crf 23 -fflags +genpts joined-file.mp4"


  


  After that I run this command, mentioned here : How to add a new audio (not mixing) into a video using ffmpeg ?

  


  ffmpeg -i joined-file.mp4 -i audio.mp3 -filter_complex "[0:a][1:a]amerge=inputs=2[a]" -map 0:v -map "[a]" -c:v copy -ac 2 -shortest output.mp4


  


  What is causing this issue ?

  


  Thanks. :)

  


  UPDATE :

  


  Here are the commands that I have been running :

  


  ffmpeg -i "middle/b.mp4" -c:v copy -video_track_timescale 30k -c:a aac -ac 6 -ar 44100 -shortest "wrap/b.mp4"
ffmpeg -f concat -i "concat-file.txt" -map 0:v -map 0:a -c:v libx264 -crf 23 -fflags +genpts "joined/abc.mp4"
ffmpeg -i "joined/abc.mp4" -i audio.mp3 -filter_complex "[0:a:0][1:a:0]amerge=inputs=2[a]" -map 0:v -map "[a]" -c:v copy -ac 2 -shortest "final/abc-cmplt.mp4"


  


  Here is the "concat-file.txt" :

  


  file 'bits/a.mp4'
file 'wrap/b.mp4'
file 'bits/c.mp4'


  


  All the video files a.mp4, b.mp4 and c.mp4 have their original audio. After I run the commands above, the joint video abc-cmplt.mp4 has combined audio (audio.mp3 plus their own) for the first (a.mp4) and last parts (c.mp4). However, the middle part only has its own audio and the extra audio I am trying to add does not seem to merge with the audio of b.mp4 in the final joint file.

  


  Output of ffmpeg -i bits/a.mp4 -i wrap/b.mp4 -i bits/c.mp4 :

  


  ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 9.2.1 (GCC) 20200122
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'bits/a.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41
    creation_time   : 2021-03-10T08:50:04.000000Z
  Duration: 00:00:01.05, start: 0.000000, bitrate: 1846 kb/s
    Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1080x1920 [SAR 1:1 DAR 9:16], 1462 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc (default)
    Metadata:
      creation_time   : 2021-03-10T08:50:04.000000Z
      handler_name    : ?Mainconcept Video Media Handler
      encoder         : AVC Coding
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 317 kb/s (default)
    Metadata:
      creation_time   : 2021-03-10T08:50:04.000000Z
      handler_name    : #Mainconcept MP4 Sound Media Handler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'wrap/b.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 00:00:27.93, start: 0.000000, bitrate: 234 kb/s
    Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1080x1920, 231 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'bits/c.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41
    creation_time   : 2021-03-10T08:42:52.000000Z
  Duration: 00:00:01.05, start: 0.000000, bitrate: 1829 kb/s
    Stream #2:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1080x1920 [SAR 1:1 DAR 9:16], 1320 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc (default)
    Metadata:
      creation_time   : 2021-03-10T08:42:52.000000Z
      handler_name    : ?Mainconcept Video Media Handler
      encoder         : AVC Coding
    Stream #2:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 317 kb/s (default)
    Metadata:
      creation_time   : 2021-03-10T08:42:52.000000Z
      handler_name    : #Mainconcept MP4 Sound Media Handler