![]() The license of libfdk_aac is not compatible with GPL, so the GPL does not permit distribution of binaries containing incompatible code when GPL-licensed code is also included. The examples in this guide will use the extensions MP4 and M4A.įFmpeg supports three AAC-LC encoders ( aac, libfdk_aac, aac_at) and two HE-AAC (v1/2) encoder ( libfdk_aac, aac_at). ![]() The second-most common use is within MKV (Matroska) files because it has better support for embedded text-based soft subtitles than MP4. It is often used within an MP4 container format for music the. Advanced Audio Coding (AAC) is the successor format to MP3, and is defined in MPEG-4 part 3 (ISO/IEC 14496-3).
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