[linux-minidisc] Minidisc - Upload and conversion of atrac3plus [fwd: jan.olav@ramson.org]

Adrian Glaubitz <glaubitz@physik.fu-berlin.de> · Tue, 16 Mar 2010 18:29:08 +0100

Hi,

this is the first mail which I received from this user. Since it's
better to discuss the topics on the ML, I'll forward Jan's mail.

Adrian

Hello,

thank you very much for your work to create an open alternative for using
MiniDiscs. I have many recordings that I am eager to transfer and decode
-> encode, and have a few question that I could not find in the faq.

I have the following devices:

MZ-RH1
MZ-R50
MZ-R55

1.
MZ-RH1 (Hi-LP/Hi-SP): Uploading works fine and produces .oma files.
However, when I import these files into SonicStage for conversion to wav,
SonicStage states that some of the files are protected and refuses to
convert them. In other words, some files import and convert just fine,
while others get imported (and can be played), but cannot be converted
(making them essentially useless). I have so far not been able to identify
any differences that would explain why some files are marked as protected
while others are not.

i) Is this a known problem, (or perhaps a user error on my part)?
ii) Is there a known solution?
iii) Is there an atrac3plus decoder available for GNU/Linux (for tracks
that are not encrypted).

2.
MZ-R50 and MZ-R55 (SP-Mono/SP-Stereo): Using lsmd.py all tracks lists as
unprotected. Uploading with upload.py works fine and produces .aea files.
However, using FFmpeg (version SVN-r22323), only a few tracks are
identified as atrac1 (most cannot be identified as such, even though the
format is the same, e.g. some SP-Mono tracks can be identified as such,
while others cannot):

:~/software/hiMd/08032010/linux-minidisc/netmd/mz-r50> ffmpeg -i
mz-r50_SP_mono.aea
FFmpeg version SVN-r22323, Copyright (c) 2000-2010 the FFmpeg developers
  built on Mar  8 2010 11:34:33 with gcc 4.4.1 [gcc-4_4-branch revision
150839]
  configuration:
  libavutil     50.11. 0 / 50.11. 0
  libavcodec    52.57. 0 / 52.57. 0
  libavformat   52.55. 0 / 52.55. 0
  libavdevice   52. 2. 0 / 52. 2. 0
  libswscale     0.10. 0 /  0.10. 0
[aea @ 0x117d3c0]max_analyze_duration reached
[aea @ 0x117d3c0]Estimating duration from bitrate, this may be inaccurate
Input #0, aea, from 'mz-r50_SP_mono.aea':
  Duration: 00:00:14.96, bitrate: 292 kb/s
    Stream #0.0: Audio: atrac1, 44100 Hz, mono, flt, 292 kb/s
At least one output file must be specified
:~/software/hiMd/08032010/linux-minidisc/netmd/mz-r50>

Most tracks produces output like this:

:~/software/hiMd/08032010/linux-minidisc/netmd/mz-r50> ffmpeg -i
mz-r50_SP_stereo.aea
FFmpeg version SVN-r22323, Copyright (c) 2000-2010 the FFmpeg developers
  built on Mar  8 2010 11:34:33 with gcc 4.4.1 [gcc-4_4-branch revision
150839]
  configuration:
  libavutil     50.11. 0 / 50.11. 0
  libavcodec    52.57. 0 / 52.57. 0
  libavformat   52.55. 0 / 52.55. 0
  libavdevice   52. 2. 0 / 52. 2. 0
  libswscale     0.10. 0 /  0.10. 0
[NULL @ 0x117d3c0]Format detected only with low score of 24, misdetection
possible!
[mp3 @ 0x1186710]Header missing
    Last message repeated 422 times
[mp3 @ 0x117d3c0]Could not find codec parameters (Audio: mp1, 0 channels,
s16)
[mp3 @ 0x117d3c0]Estimating duration from bitrate, this may be inaccurate
mz-r50_SP_stereo.aea: could not find codec parameters
:~/software/hiMd/08032010/linux-minidisc/netmd/mz-r50>

i) Do you know if this is a problem with ffmpeg?
ii) Are there any command-line options I can use to rectify the problem?
(I have tried quite a few without success.)

Please find four samples attached, SP-Mono and SP-Stereo recorded on the
MZ-R50 and MZ-R55, respectively.

3)
I am interested in learning more about the MiniDisc and would be grateful
if I could have a user account for the wiki, enabling me to read all of
the contents.

Once again, thank you for the great work done so far!

Yours sincerely

Jan Olav Stangeland

mz-r50_SP_mono.aea
mz-r50_SP_stereo.aea
mz-r55_SP-mono.aea
mz-r55_SP_stereo.aea