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Archive for November, 2016

convert mp4 to webm and ogv

November 5, 2016 1 comment

Problem
I wanted to share an .mp4 file on my webserver but Firefox didn’t play it. It turned out Firefox prefers the .webm and .ogv formats, while Chrome can play .mp4.

Solution

Convert mp4 then:

.mp4 to .webm

ffmpeg -i input.mp4 -vcodec libvpx -acodec libvorbis -b:v 600k -cpu-used 4 -threads 8 output.webm

To change the quality, play with the “600k” value (bitrate).

.mp4 to .ogv

ffmpeg -i final.mp4 -vcodec libtheora -acodec libvorbis -b:v 600k -cpu-used 4 -threads 8 final.ogv

Here the difference is the codec (libtheora instead of libvpx).

Maybe I missed something, but the .webm file seemed to me to have better quality than .ogv. So I think it’s enough to support two formats only: .mp4 for Chrome and .webm for Firefox. By the way, in my test the input file (.mp4) had the best quality and smallest filesize, but again, I may miss something.

And here is an HTML5 code that can play your video:

<video controls preload="metadata" width="1024" height="768" poster="images/front.jpg">
    <source src="video.mp4" type="video/mp4">
    <source src="video.webm" type="video/webm">
    <p>Please use a modern browser to view this video.</p>
</video>
Categories: firefox Tags: , , , , , ,

[manjaro] no sound

November 3, 2016 Leave a comment

Problem
After a reboot sound stopped working.

Solution
After a few hours of trying everything, the following solution worked for me:

  1. delete the folder ~/.config/pulse
  2. pulseaudio -k
  3. pulseaudio --start
Categories: manjaro Tags: ,