I have a number of radio programmes set to record in my pvr which runs
nightly. Since 17 January the resulting .m4a files will not play on my
usual Linn DS rendering devices.
I am trying to identify the source of the problem.
I see nothing remarkable to me in the --verbose output from GiP. I have
this in a text file of 150+ lines. Can I post it here?
So far the only difference between an m4a file of similar length which
plays and one which doesn't is that when I look at them with
AtomicParsley and ffprobe I get the messages which I have extracted from
the output for brevity here:
NON Playing Files I get:-
AtomicParsley version: 0.9.6 (utf8)
------------------------------------------------------
Movie duration: 823.275 seconds (13:43.28) - 320.00* kbp/sec bitrate
(*=approximate)
Low-level details. Total tracks: 1
Trk Type Handler Kind Lang Bytes
1 soun SoundHandler mp4a eng 32930987
320.00 kbp/s MPEG-4 Unknown profile: 0x0 channels: (2)
FFprobe:
...Duration: 00:27:50.40, start: 0.000000, bitrate: 321 kb/s
Stream #0:0(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo,
fltp, 320 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream #0:1: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown),
150x84 [SAR 72:72 DAR 25:14], 90k tbr, 90k tbn, 90k tbc
Files which DO PLAY I get:-
AtomicParsley version: 0.9.6 (utf8)
------------------------------------------------------
Movie duration: 1996.800 seconds (33:16.80) - 320.00* kbp/sec bitrate
(*=approximate)
Low-level details. Total tracks: 1
Trk Type Handler Kind Lang Bytes
1 soun SoundHandler mp4a eng 79872007
320.00 kbp/s MPEG-4 AAC Low Complexity/LC Profile channels: [2]
FFprobe:
Duration: 00:33:16.80, start: 0.000000, bitrate: 321 kb/s
Stream #0:0(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
stereo, fltp, 320 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream #0:1: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown),
150x84 [SAR 72:72 DAR 25:14], 90k tbr, 90k tbn, 90k tbc
The difference seems to be in the absence of the LC Profile. Can
somebody please tell me what this means and where this comes from. Is
the problem likely to be from my machine, which seems probable, in which
case where should I look?
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