https://bugzilla.wikimedia.org/show_bug.cgi?id=60554
Web browser: ---
Bug ID: 60554
Summary: PEAR File_Ogg reports ogg/flac having 0 second length
if
Product: MediaWiki extensions
Version: unspecified
Hardware: All
URL: https://commons.wikimedia.org/wiki/File:Tim_Berners-Le
e_-_Today_(flac_-sample_s16_-f_ogg).oga
OS: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: TimedMediaHandler
Assignee: md...@wikimedia.org
Reporter: bawolff...@gmail.com
CC: aarcos.w...@gmail.com, bawolff...@gmail.com,
fflo...@wikimedia.org, gti...@wikimedia.org,
jger...@wikimedia.org, mtrac...@member.fsf.org
Classification: Unclassified
Mobile Platform: ---
Ogg/flac files are allowed to have the total sample count field set to unknown
(aka 0). When this happens, File_Ogg (and by extension TMH) reports the flac
file has a length of 0 seconds, which is wrong.
I think what needs to happen in these situations is to take the
approx_granule_pos and divide by sample_rate.
----
To quote ogg/flac spec:
"Redundant fields in the STREAMINFO packet may be set to zero (indicating
"unknown" in native FLAC), which also facilitates single-pass encoding. These
fields are: the minimum and maximum frame sizes, the total samples count, and
the MD5 signature. "Unknown" values for these fields will not prevent a
compliant native FLAC or Ogg FLAC decoder from decoding the stream."
Example file:
https://commons.wikimedia.org/wiki/File:Tim_Berners-Lee_-_Today_(flac_-sample_s16_-f_ogg).oga
See also:
https://commons.wikimedia.org/w/index.php?title=Commons:Village_pump&oldid=115012285#FLAC_on_Apple_devices
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