Multimedia on iniy.org

Converting videos with ffmpeg to webm format under Ubuntu 14.04.

Thu, 15 Jan 2015 08:00:55 +0000

I just love ffmpeg, because it is so easy to use and scriptable.

Install FFMPEG on Ubuntu 14.04

sudo apt-add-repository ppa:jon-severinsson/ffmpeg
sudo apt-get update
sudo apt-get install ffmpeg

Convert a video to webm

ffmpeg -i video.avi -c:v libvpx -crf 10 -b:v 1M -c:a libvorbis -q:a 6 -threads 4 video.webm

Boosting Audio Output under Ubuntu Linux

Sat, 26 Oct 2013 12:18:29 +0000

I often had the problem when I wanted to watch a movie or listen to some audiofile and there was background noise I wanted to turn up the volume but it was already at 100% . I thought it should be possible to turn up the signal beyond 100% and decide by myself if the signal is clipping/distored. And there is a very easy solution for the people using pulseaudio.

streaming fun for everyone

Mon, 26 Jul 2010 19:46:49 +0000

How to setup a complete HTML5 live-streaming environment in less than 30 minutes.

Prerequisites

some kind of linux root server (can also be vserver), i prefer debian or ubuntu
a linux computer (best a laptop) with firewire input
a DV-Cam with firewire output

install the server

the hard part :D

Encoding h.264 Video with ffmpeg

Sun, 29 Nov 2009 22:47:49 +0000

Until now this page is just a reminder for myself. Explanation of the parameters may follow some time.

# firstpass

ffmpeg -an -pass 1 -threads 4 -i inputfile.mpg -vcodec libx264 -b 1000k -flags +loop+mv4 -cmp 256 \
 -partitions +parti4x4+parti8x8+partp4x4+partp8x8+partb8x8 \
 -me_method hex -subq 7 -trellis 1 -refs 5 -bf 3 \
 -flags2 +bpyramid+wpred+mixed_refs+dct8x8 -coder 1 -me_range 16 \
	 -g 250 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -qmin 10 \
 -qmax 51 -qdiff 4 \
 temp.mp4

# second pass
ffmpeg -i inputfile.mpg -acodec libfaac -ar 44100 -ab 128k -pass 2 -threads 4 \
 -vcodec libx264 -b 1000k -flags +loop+mv4 -cmp 256 \
 -partitions +parti4x4+parti8x8+partp4x4+partp8x8+partb8x8 \
 -me_method hex -subq 7 -trellis 1 -refs 5 -bf 3 \
 -flags2 +bpyramid+wpred+mixed_refs+dct8x8 -coder 1 -me_range 16 \
	 -g 250 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -qmin 10 \
 -qmax 51 -qdiff 4 \
 temp.mp4

#rename
mv temp.mp4 outfile.mp4