On 27/10/2019 20:56, Budge wrote: > On 23/10/2019 16:23, Budge wrote: >> On 23/10/2019 13:24, Owen Smith wrote: >>> I understand the need to convert aac that the player won't play. But surely >>> mp3 would be the last choice to convert them to, given converting one lossy >>> format to another is just about the worst thing you can do to audio. >>> Sometimes there are nasty interactions between the different perceptual >>> models. >>> >>> Wouldn't a better option be to first try converting to flac (something like >>> level 5 compression), then if the player can't handle that try wav (which >>> might need a sample rate conversion if the player assumes 44.1 for >>> example), and then mp3 as a desperate last resort? >>> >> >> Hi Owen and thanks for your comment. I am certainly not rushing to >> convert to mp3 but rather to pin down the problem with Linn DS players >> and the earlier quotation just picks up on some history. Unfortunately >> Linn software and firmware is proprietary and last time I raised a >> problem with Linn I didn't make any progress. In fact I found that >> their firmware updates didn't work as well for what I needed but was >> able to regress to earlier version which was OK and the problem is only >> with certain files which now play but have some issues. >> Regards, >> Budge >> >> _______________________________________________ >> get_iplayer mailing list >> get_iplayer@lists.infradead.org >> http://lists.infradead.org/mailman/listinfo/get_iplayer >> > > 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. > > > _______________________________________________ > get_iplayer mailing list > get_iplayer@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/get_iplayer > Correction. Not HE above, just AAC. Budge
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