Différences

Ci-dessous, les différences entre deux révisions de la page.

--- informatique:video [01/02/2016 11:37] – cyrille
+++ informatique:video [14/11/2025 17:57] (Version actuelle) – [avconv] cyrille
@@ Ligne 6: / Ligne 6: @@
 ===== Conversion de format =====
-Sur mon ubuntu:
+==== avconv ====
-  avconv -i the_video.mp4 the_video.webm
+Bons articles:
+  * http://www.thehelloworldprogram.com/web-development/encode-video-and-audio-for-html5-with-avconv/
+Pour WEBM:
+<code bash>
+avconv -i the_video.mp4 the_video.webm
+</code>
 Mais c'est très lent, genre en temps réel ...
+Pour FLV:
+<code bash>
+avconv -i the_video.mp4 -ar 44100 the_video.flv
+</code>
+Beaucoup (extrêmement) plus rapide que WEBM. Obligé d'indiquer audio_rate (-ar) sinon ne se lance pas, erreur : //Could not write header for output file #0 (incorrect codec parameters ?): Function not implemented//
+==== ffmpeg ====
+<code bash>
+ffmpeg -i file.avi output.mp4
+ffmpeg -i file.avi -vcodec mpeg4 -f mpeg output.mp4
+</code>
 ===== Web player =====
-==== Video.js ====
+====Pour le web====
+We need to encode our video with several different codecs so **that every browser can play** the one it likes. Codecs are a way to compress digital media. There are dozens of video codecs, but the ones you should know about for web videos are **H.264, vp8, and theora**. Each type of encoded videos is housed in a different type of container. Again, there are dozens of video containers, but for web videos you only need to know about **mp4, webm, and ogg**.
+<code html>
+ <video width="400" height="225" poster="img/quickfox.jpg" controls>
+    <source src="video/quickfox.mp4" type="video/mp4" />
+    <source src="video/quickfox.ogg" type="video/ogg" />
+    <source src="video/quickfox.webm" type="video/webm" />
+ </video>
+</code>
+===== Video.js =====
 http://videojs.com/getting-started/