On 27/10/2019 21:08, Budge wrote:
On 27/10/2019 20:56, Budge wrote:
Further to this thread as it has developed I find I have two example
files both downloaded with GiP. Using ffprobe, one is shown as:-
Duration: 02:33:00.99, 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 (Baseline), yuvj420p(pc,
bt470bg/unknown/unknown), 150x84 [SAR 72:72 DAR 25:14], 90k tbr, 90k
tbn, 90k tbc (attached pic)
and the second:-
Duration: 02:37:00.06, start: 0.000000, bitrate: 321 kb/s
Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz,
stereo, fltp, 320 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream #0:1: Video: mjpeg (Baseline), yuvj420p(pc,
bt470bg/unknown/unknown), 86x48 [SAR 72:72 DAR 43:24], 90k tbr, 90k tbn,
90k tbc (attached pic).
Among the differences I note first is AAC, I assume HE? at 48000Hz and
the second is AAC (LC) at 44100Hz.
The first is later and dated 2017-01-19 and the second 2014-05-15.
It is the earlier download that works and I still believe the problem
has been from my incorrect setting up of GiP. Both files play on all my
players except the Linn DS devices.
I am about to pass the problem over to Linn but before I do please could
somebody suggest why the two files have different codecs.
Correction. Not HE above, just AAC.
Budge
The principal difference between the two files is that the one that
works has a sampling rate of 48kHz and the one that doesn't has a
sampling rate of 44.1kHz. One possibility is that Linn does not support
a 44.1kHz sampling rate, although it would be very surprising if it didn't.
Since "Linn recommends FLAC" you could try converting the 44.1kHz
sampling rate file to FLAC at the same sampling rate. You could also
try resampling the 44.1kHz sampling rate file to 48kHz.
What puzzles me is how you got a file with a sampling rate of 44.1kHz
and a bit rate of 320kbit/s. I am not saying that is not a valid
combination; it is. What I am saying is that as far as I am aware it is
not a combination available from the BBC.
Many radio programmes are available as podcasts. You can download a
podcast from the BBC website. You will be offered a choice of bit
rates, 64kbit/s and 128kbit/s. The file will be in MP3 format with a
sampling rate of 44.1kHz.
If you download a radio programme with get_iplayer without using the
--raw option you will get a M4A/AAC file with a sampling rate of 48kHz.
You will have a choice of bit rates, in some cases up to 320kbit/s.
In the last few months programmes with podcasts have also had podcast
versions which can be downloaded with get_iplayer. More recently still
for some programmes the only download available with get_iplayer has
been the podcast version. In either case the file format has been
M4A/AAC and the sampling rate has been 48kHz.
One example of a Radio 3 programme with a podcast is The Listening Service.
get_iplayer --pid=m0009jzd --info
shows that it has both original and podcast versions and, for both, bit
rates up to 320kbit/s are available. If you download it you will see
the sampling rate is 48kHz.
If you go to the programme's website
https://www.bbc.co.uk/programmes/b078n25h/episodes/downloads
the download buttons will offer a choice of 64kbit/s and 128kbit/s bit
rates. If you download one of them you will get a MP3 file with a
sampling rate of 44.1kHz.
There is no option which combines a 44.1kHz sampling rate with a bit
rate of 320kbitj/s.
I have just read your post again, and it seems I have got the one that
works and the one that doesn't the wrong way round. It seems even more
unlikely that your Linn device would not support a 48kHz sampling rate,
although 44.1kHz is the CD standard.
Best wishes
Richard
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