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cogburnd02Trying to figure out a file format: "A85" Anyone ever come across audio files with a .A85 extension?
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thubancogburnd02: en.wikipedia.org/wiki/Ascii85 ?
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thuban(not that i've heard of it ever being used for audio, but if in the mists of time you wanted to send binary data over a 7-bit protocol...)
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thubanwhere did you find them? ffprobe/mediainfo say anything useful?
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cogburnd02No, it's definitely not ascii85. can't get ffmpeg to be of any help.
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thuban`file`?
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cogburnd02"data"
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thubanoof
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cogburnd02looking at it in frhed portable it doesn't seem to have any identifiable type of file signature
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cogburnd02it's audio files from a Playaway audiobook.
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cogburnd02
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cogburnd02based on that it should be decodable with some kind of decoder from 3gpp.org/ftp/Specs/archive/26_series/26.304
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cogburnd02but I can't get that to work either.
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thubanhuh!
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thubanwhat issue did you have?
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cogburnd02Yeah I just got one on ebay and soldered a usb connector on the same pads as mentioned in the article and it just shows up as a mass storage device
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cogburnd02oh let me see if i can find the error it gave me.
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cogburnd02decoder.exe -ff raw -if "0000 The DaVinci Code 0001.A85" -of "0000 The DaVinci Code 0001.wav"
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cogburnd02that's from "26304-900"
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thubanthat looks like a command and not an error to me. was there output?
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thuban(care to upload the input file somewhere?)
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cogburnd02There was a wav file produced, but it didn't play. they all also seem way too small? I can try uploading them on mega
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thubani think this qualifies as on topic, so consider putting one (preferably form the middle of the list) on transfer.archivete.am instead
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thuban*from
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thubando your audio player/ffprobe show errors when run on the wav output, or is there just no sound?
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cogburnd02I ffprobed the wav and along with for some reason its entire compilation-time options it gives me this:[wav @ 062c3900] Cannot check for SPDIF
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cogburnd02pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, 2 channels, s16, 1536 kb/s
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cogburnd02Also here are all the files on mega: mega.nz/folder/OlwjgaSb#Zvo9q0SluuOUSC6M6UHvAg
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cogburnd02I should probably go to sleep now. I have to work later.
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cogburnd02also should probably note that my player had a different SoC than the one that article mentions. Mine has a STMP3501 which says it can do WMA and mp3 but is 'upgradeable to other digital music formats.' Datasheet here: datasheetspdf.com/pdf-file/542203/SigmaTel/STMP3501/1
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thubani don't even get that far, either because i'm using the latest release ('h00') or because i'm running it through wine--with `-ff raw` i get "Internal Sampling Frequency not supported with AMW WB and caracterized WB+ modes" if i try the first file (or all the files catted together), or "Sampling rate not supported" if i try one of the other files.
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thuban(`-ff 3gp` eliminates the error, but exits immediately after printing 'Running' and produces unplayable output.)
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thubanbuilding the decoder locally to debug would be non-trivial for me, but maybe someone who knows more about windows could elucidate the visual studio project structure enough to put together some makefiles?
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cogburnd02perhaps sourceforge.net/projects/vcproj2cmake along with 26304_ANSI-C_source_code_v6_6_0\MSVC\decoder\decoder.vcproj
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cogburnd02this is all also assuming that the AMR-WB+ format is indeed the format these files are in.
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JAAmega.nz/folder/OlwjgaSb#Zvo9q0SluuOUSC6M6UHvAg rehosted because MEGA stinks: transfer.archivete.am/sJVIL/H..zip
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JAAAssuming it is AMR-WB+: ffmpeg doesn't support that: trac.ffmpeg.org/ticket/6140 3GP would be a container format (like MKV or MP4) and can *contain* AMR-WB+ data, but raw AMR-WB+ wouldn't be wrapped in 3GP.