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The audio/mpeg,mpegversion=2 caps in GStreamer refer to MPEG-2 AAC (ISO 13818-7), not to the extended MP3 (ISO 13818-3), which is audio/mpeg,mpegversion=1,mpegaudioversion=2/3 Fix the caps, and add handling for MPEG-2 AAC in both ADTS and raw form, adding ADTS headers for the latter.
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