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  • Pas question de marché, de cloud etc...

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    Le vocabulaire utilisé sur ce site essaie d’éviter toute référence à la mode qui fleurit allègrement
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    Vous êtes donc invité à bannir l’utilisation des termes "Brand", "Cloud", "Marché" etc...
    Notre motivation est avant tout de créer un outil simple, accessible à pour tout le monde, favorisant
    le partage de créations sur Internet et permettant aux auteurs de garder une autonomie optimale.
    Aucun "contrat Gold ou Premium" n’est donc prévu, aucun (...)

  • Encoding and processing into web-friendly formats

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    MediaSPIP automatically converts uploaded files to internet-compatible formats.
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Sur d’autres sites (7102)

  • Berlin website owners need consent for using Google Analytics

    19 novembre 2019, par Joselyn Khor — Uncategorized

    Website owners in Berlin need consent for using Google Analytics

    According to the Berlin Data Protection Office, if you’re a website owner collecting and sending data to third-party services (like Google Analytics) who are also using that data “for own purpose uses” in Berlin, you are now required to ask for specific consent from visitors in order to collect that information. 

    This means you can only use Google Analytics or similar services once you’ve gotten consent from visitors. In contrast, Matomo does not use information from Cloud or On-Premise users for “own purpose uses”.

    Consent is also needed when keystrokes or mouse movements are recorded. That means you need users to consent to your usage of features like Heatmaps and Session Recordings.

    It’s advised that website owners in Berlin should check their websites for third-party content and tracking mechanisms. If you do use these third-party functions that require consent, you must either get consent or remove the functions. Consent is only effective if the visitor (whose data you’re collecting) is informed and agrees to their data being processed.

    Currently this applies to website owners in Berlin, and should likely be applied for the whole of Germany to be on the safe side.

    Further reading :

    And learn more about all the features in our GDPR user guide and privacy user guide. You can also learn more about GDPR through our blog posts.

  • h264_mp4toannexb filter failed to receive output packet while ffmpeg concat

    10 août 2022, par AlexZheda

    I am writing a very easy concat script for a list of videos.

    



    (for %i in (*.mp4) do @echo file '%i') > mylist.txt

    



    ffmpeg -safe 0 -f concat -i mylist.txt -c copy merged.mp4

    



    Yet the log says something weird h264_mp4toannexb filter failed to receive output packet”
Those files are rendered in VLC, but at certain timestamps they start to disallow moving the playtime cursor. I suspect that might be the case but I do not see much from the failed files.

    



    The file(s) it fails on has the following description (ffmpeg -i fn.mp4)
enter image description here

    



    EDIT : Truncated stats from all of the files in order.

    



    [{'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 2715 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1664 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1438 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1473 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1479 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1502 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1514 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1581 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1600 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1814 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1136 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1747 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1872 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1538 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 2839 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1595 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1733 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1623 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1634 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1564 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1635 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1674 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1809 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1650 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1773 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1643 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1802 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1766 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1809 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1641 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1812 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1984 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1787 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1912 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1839 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1903 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1826 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1900 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1773 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1799 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1933 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 2023 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1971 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 2071 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1997 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1692 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1785 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
 {'Stream #0:0': '    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 2049:2048 DAR 683:384], 1864 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)',
  'Stream #0:1': '    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)'},
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  • Use deck.js as a remote presentation tool

    8 janvier 2014, par silvia

    deck.js is one of the new HTML5-based presentation tools. It’s simple to use, in particular for your basic, every-day presentation needs. You can also create more complex slides with animations etc. if you know your HTML and CSS.

    Yesterday at linux.conf.au (LCA), I gave a presentation using deck.js. But I didn’t give it from the lectern in the room in Perth where LCA is being held – instead I gave it from the comfort of my home office at the other end of the country.

    I used my laptop with in-built webcam and my Chrome browser to give this presentation. Beforehand, I had uploaded the presentation to a Web server and shared the link with the organiser of my speaker track, who was on site in Perth and had set up his laptop in the same fashion as myself. His screen was projecting the Chrome tab in which my slides were loaded and he had hooked up the audio output of his laptop to the room speaker system. His camera was pointed at the audience so I could see their reaction.

    I loaded a slide master URL :
    http://html5videoguide.net/presentations/lca_2014_webrtc/?master
    and the room loaded the URL without query string :
    http://html5videoguide.net/presentations/lca_2014_webrtc/.

    Then I gave my talk exactly as I would if I was in the same room. Yes, it felt exactly as though I was there, including nervousness and audience feedback.

    How did we do that ? WebRTC (Web Real-time Communication) to the rescue, of course !

    We used one of the modules of the rtc.io project called rtc-glue to add the video conferencing functionality and the slide navigation to deck.js. It was actually really really simple !

    Here are the few things we added to deck.js to make it work :

    • Code added to index.html to make the video connection work : 
      <meta name="rtc-signalhost" content="http://rtc.io/switchboard/">
      
<meta name="rtc-room" content="lca2014">
      
...
      
<video id="localV" rtc-capture="camera" muted></video>
      
<video id="peerV" rtc-peer rtc-stream="localV"></video>
      
...
      
<script src="glue.js"></script>
      
<script>
      
glue.config.iceServers = [{ url: 'stun:stun.l.google.com:19302' }];
      
</script>

      The iceServers config is required to punch through firewalls – you may also need a TURN server. Note that you need a signalling server – in our case we used http://rtc.io/switchboard/, which runs the code from rtc-switchboard.

    • Added glue.js library to deck.js :

      Downloaded from https://raw.github.com/rtc-io/rtc-glue/master/dist/glue.js into the source directory of deck.js.

    • Code added to index.html to synchronize slide navigation : 
      glue.events.once('connected', function(signaller) {
      
  if (location.search.slice(1) !== '') {
      
    $(document).bind('deck.change', function(evt, from, to) {
      
      signaller.send('/slide', {
      
        idx: to,
      
        sender: signaller.id
      
      });
      
    });
      
  }
      
  signaller.on('slide', function(data) {
      
    console.log('received notification to change to slide: ', data.idx);
      
    $.deck('go', data.idx);
      
  });
      
});

      This simply registers a callback on the slide master end to send a slide position message to the room end, and a callback on the room end that initiates the slide navigation.

    And that’s it !

    You can find my slide deck on GitHub.

    Feel free to write your own slides in this manner – I would love to have more users of this approach. It should also be fairly simple to extend this to share pointer positions, so you can actually use the mouse pointer to point to things on your slides remotely. Would love to hear your experiences !

    Note that the slides are actually a talk about the rtc.io project, so if you want to find out more about these modules and what other things you can do, read the slide deck or watch the talk when it has been published by LCA.

    Many thanks to Damon Oehlman for his help in getting this working.

    BTW : somebody should really fix that print style sheet for deck.js – I’m only ever getting the one slide that is currently showing. ;-)

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