Saiweb » Search Results » ffmpeg

Jing PRO MP4 quality issue

Buzz — Thu, 08 Jan 2009 13:55:52 +0000

Ok I purchased Jing PRO to do some more video posts to saiweb … unfortunately the MP4 quality is lack luster.

To be honest I’d rather have a large size MP4 I can run through my own encode (i.e. FFMPEG) and get the quality I want …

Off goes the email to support … wooo ….

NOTE: You may have to watch the vid in fullscreen to view it properly, I have scaled the player down to fit the blog page width.Tweet

Perfecting h264 conversion with ffmpeg

Buzz — Tue, 06 Jan 2009 20:34:04 +0000

Liam (http://goodingsweb.com) has shared his findings on tweaking ffmpeg output with h.264, he has taken a 174MB flv file down to just 24MB (86% reduction in file size).

There is no noticeable difference in quality either, you can follow the forum thread here: http://flowplayer.org/forum/7/12671.

Click the video for a preview of Liam’s settings:

FFMPEG Build your own HD YouTube – Update

Buzz — Thu, 14 Aug 2008 10:44:04 +0000

Well the intrest in this subject seems to be picking up!

I am currently researching two pass encoding using libx264 and libfaac to allow low bitrate (fast loading) HD streaming.

As I figure this out you can see the results here: http://www.saiweb.co.uk/linux/very-basic-c-gdb-tutorial

The embeding is handeled using a wordpress plugin I have written, I will make this available shortly.

I will be getting part one “FFMPEG” installation up today regardless.Tweet

FFMPEG Build your own HD YouTube – Introduction

Buzz — Fri, 08 Aug 2008 13:51:39 +0000

The thing that has realy annoyed me lately is the lack of documentation to be found for FFMPEG, the documentation you can find is by way of MAN pages, and makes the assumption you allready know all the terms that go with video encoding.

Well I am to change that.

Over the next few days I will be producing a Video set “Build your own HD YouTube” covering installation of FFMPEG, to building a basic PHP front end (without using PHP-FFMPEG), and finaly a summary covering methods you should use if you want to use the methods covered in a production envrionment.Tweet

ffmpeg MP4 does not stream qt-faststart

Buzz — Wed, 06 Aug 2008 14:14:44 +0000

ffmpeg comes with a tool to re-order the MP4 “atoms” (Seriously don’t ask what are MP4 atoms it’s geek for the sake of geek).

find the file in ffmpeg_src/tools/qt-faststart.c

compile with gcc

1	gcc qt-faststart.c -o qt-faststart

And run.

1	/path/to/qt-faststart /path/to/src_vid.mp4 /path/to/output.mp4

NOTE: This only seems to work for h264 encoded videos (libx264).Tweet

ffmpeg installation on RHEL 4

Buzz — Wed, 06 Aug 2008 11:28:59 +0000

Just try to find documentation on this … absolute nightmare is an understatement, so here are my notes of the steps I took to compile ffmpeg with a selection of codecs:

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up2date automake autoconf libtool
wget http://downloads.sourceforge.net/faac/faac-1.26.tar.gz
wget http://downloads.sourceforge.net/faac/faad2-2.6.1.tar.gz
wget http://superb-west.dl.sourceforge.net/sourceforge/lame/lame-3.98b6.tar.gz
wget http://downloads.xiph.org/releases/ogg/libogg-1.1.3.tar.gz
wget http://downloads.xiph.org/releases/theora/libtheora-1.0beta2.tar.gz
wget http://downloads.xiph.org/releases/vorbis/libvorbis-1.2.0.tar.gz
wget http://downloads.xvid.org/downloads/xvidcore-1.1.3.tar.gz
wget ftp://ftp.videolan.org/pub/videolan/x264/snapshots/x264-snapshot-20080805-2245.tar.bz2

NOTE: The above are current at the time of writing, check for more recent versions at the relevant sites.

Extract:

1 2	for i in .tar.gz; do tar -xzvf "$i"; done for i in .tar.bz2; do tar -xjvf "$i"; done

cd to relevant directories and run the following:

faac & faad2: ./bootstrap && ./configure && make && make install
xvidcore: cd build/generic; ./configure && make && make install
libx264: ./configure –enable-shared –disable-asm && make && make install
The rest: ./configure && make && make install

NOTE: You must install libogg prior to libvorbis and libtheora

The following is required otherwise ffmpeg will display errors about being unable to find libraries:

i.e.

1	ffmpeg: error while loading shared libraries: libavdevice.so.52: cannot open shared object file

FIX:

1 2	echo '/usr/local/lib' > /etc/ld.so.conf.d/buzz-saiweb.conf ldconfig

You must run “ldconfig” any time you install a new lib you want to use with ffmpeg!

Install FFMPEG

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svn checkout svn://svn.mplayerhq.hu/ffmpeg/trunk ffmpeg

./configure --enable-libmp3lame --enable-libvorbis --enable-libxvid --enable-shared --enable-libfaac --enable-libfaad --enable-gpl --enable-libtheora --enable-libx264

make

make install

NOTE: If you allready havea checkout of ffmpeg and run an update to get the latest code, make sure you run

1	make distclean

Prior to running the configure line.

et voila job done ….Tweet

ffmpeg install with libx264 (h264)

Buzz — Wed, 06 Aug 2008 09:04:12 +0000

The information for this is VERY very sparse, so here is a summary of what I have found.

Install libx264

Get the libx264 package from here: http://www.videolan.org/developers/x264.html

Extracts the bz2 file

1	tar -xjvf /path/to/x264-snapshot-20080805-2245.tar.bz2

And now the useual

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cd /path/to/x264-dir
./configure --enable-shared
make
make install
ldconfig

Get a nice error message:

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[root@dev01 x264-snapshot-20080805-2245]# ./configure
No suitable assembler found. Install 'yasm' to get MMX/SSE optimized code.
If you really want to compile without asm, configure with --disable-asm.

You do want MMX/SSE at somepoint for the time being I am disabling this though (lack of time to find a valid RHEL source). so I added the disable asm line.

Install ffmpeg

For this I use subversion.

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cd /path/to/where/I/want/sources
svn checkout svn://svn.mplayerhq.hu/ffmpeg/trunk ffmpeg
cd /path/to/where/I/want/sources/ffmpeg
./configure --enable-libx264 --enable-gpl --enable-shared
make
make install

et voila ffmpeg is now installed with libx264 (h264).

error while loading shared libraries: libavdevice.so.52: cannot open shared object file: No such file or directory

To fix this:

1	vi /etc/ld.so.conf.d/custom-libs.conf

Add the line : /usr/local/lib

And run ldconfig.

UPDATE: I am writing a full set of notes blog entry for installing ffmpeg with codecs on RHEL4Tweet

About Me

Buzz — Fri, 22 Feb 2008 09:45:10 +0000

David Busby (aka Buzz, Aka Oneiroi)

I have been a systems admin and developer commercially since 2002, using a variety of platforms and technologies over the years. Python, PHP, C++, C#, AJAX, CSS, DHTML, XHTML, XSL, XML, JSON, SOAP, XMLRPC … to name a few

*nix daemon design and implementation (mostly written in python)
Design, Build, and maintain High Availability hosting solution, fully scalable.
RHEL/CentOS/Fedora/Debian/SuSE/Linux Administration
Apple XServe Administration (cli unix based some gui)
PHP
- WordPress
- Joomla
- Facebook
- Bespoke XML API’s
C++
ffmpeg
WordPress Extension
jQuery
L.A.M.P
W.A.M.P
Subversion Deployment / Management
- Pre commit hooks
- Post commit hooks
- Backup strategies
TRAC Deployment / Management
Subversion Extension
Bash Scripting
Nagios Deployment & Customization
- n2rrd integration
- SMS gateway integration
- Bespoke service check program authoring
- Bespoke perfdata parsing (mods_status, mySQL replication data)
SNORT IDS Experience
SNMP Monitoring / Alerting (Deployment and creation of bespoke systems)
mySQL DBA (Analysis, Benchmarking, Monitoring see: adimpleo
S.E.O
- mod_rewrite
- Delivery speed
- YSlow

**NOTE: Incomplete list above there’s just too much to mention!.

So who am I really?

I’m a Systems administrator, I’m a hacker, I’m a pentester, I’m an open source developer / contributor.

I’m one of the guys who’s working silently in the background to keep all the internet you love running .

If you have any questions please use the contact form

Currently employed by Psycle Interactive Ltd

Psycle MOTION Reel 2011 from Psycle Interactive on Vimeo.