#6207: Wrong mkv codec ID for ac3 with bitstream_id > 8
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Reporter: Carl Eugen | Owner: (none)
Hoyos |
Type: defect | Status: new
Priority: normal | Component: avformat
Version: git-master | Resolution:
Keywords: mkv ac3 | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by Balling):
For context:
http://multimediacomputingguru.blogspot.com/2014/11/bsid-9-and-10-not-in-
dolby-ac3.html
“AC3/BSID9 and AC3/BSID10 (DolbyNet) :
The ac3 frame header has, similar to the mpeg-audio header a version
field. Normal ac3 is defined as bitstream id 8 (5 Bits, numbers are 0-15).
Everything below 8 is still compatible with all decoders that handle 8
correctly. Everything higher are additions that break decoder
compatibility.
For the samplerates 24kHz (00); 22,05kHz (01) and 16kHz (10) the BSID is 9
For the samplerates 12kHz (00); 11,025kHz (01) and 8kHz (10) the BSID is
10”
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Ticket URL: <https://trac.ffmpeg.org/ticket/6207#comment:3>
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