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Category Archives: audio
A wedding, OpenKvarken, ffmpeg-mt, Collabora
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
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Main and SBR
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
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LC AAC and SBR, AMR-NB floating point, presets
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
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FFmpeg gets presets. AAC and SBR progress.
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
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progress update
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
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