Category Archives: audio

A wedding, OpenKvarken, ffmpeg-mt, Collabora

Posted on 2009/10/13 Tue by rob

Well, I’ve been quite busy over the past months, despite my lack of blog posts.
My brother got married.
FFmpeg finally has channel layout support for AAC and Vorbis. I’ve published my work-in-progress HE AAC v1 (Spectral Band Replication) code in FFmpeg’s … Continue reading →

Posted in AAC, Collabora, audio, development, ffmpeg, multimedia, technology, work | 1 Comment

Main and SBR

Posted on 2008/11/24 Mon by rob

Alex Converse has provided a patch to add frequency domain prediction to the FFmpeg AAC decoder which completes the tools required for Main profile support. This is included in FFmpeg trunk as of r15919.
SBR is coming along quite nicely and … Continue reading →

Posted in AAC, audio, development, ffmpeg, multimedia, work | Leave a comment

LC AAC and SBR, AMR-NB floating point, presets

Posted on 2008/07/23 Wed by rob

The LC AAC decoder for FFmpeg is shaping up quite well now and has entered round 4 of the reviewing process. I have a feeling that this will be the last round as the code is looking quite clean now.
I … Continue reading →

Posted in AAC, AMR, audio, development, ffmpeg, google summer of code, multimedia, work, x264 | Leave a comment

FFmpeg gets presets. AAC and SBR progress.

Posted on 2008/06/07 Sat by rob

Michael Niedermayer has added some code to FFmpeg trunk that parses text files to assign values to FFmpeg CLI options. The files have to be in <home dir>/.ffmpeg/<codec name>-<preset name>.ffpreset and can be used via -vpre/-apre/-spre for video/audio/subtitles respectively.
For example, … Continue reading →

Posted in AAC, audio, development, ffmpeg, google summer of code, multimedia, work, x264 | Leave a comment

progress update

Posted on 2008/05/30 Fri by rob

The code for SBR is mostly finished. The bitstream parsing has been implemented and all required code is completed. However, I’ve diverted my attention to getting the LC AAC code from the SoC repository into FFmpeg’s SVN trunk. Progress on … Continue reading →

Posted in AAC, audio, development, ffmpeg, multimedia, work | Leave a comment