317 kbps radio files - really?

[Owen Smith]

Radio 3 on iPlayer is always 320kbps AAC these days. There have been things said about other stations moving from 128 to 320kbps with Radio 2 being the first mentioned. Maybe they're running some tests?

Note the metadata still says 128kbps for Radio 3 like all the other channels, but the stream is actually 320kbps. This causes confusion at times. I imagine Radio 2 would behave the same if it went 320kbps.

-- 
Owen Smith <owen.smith at cantab.net>
Cambridge, UK

On 12 Jun 2014, at 01:05, Mable Syrup <blackonesugar at yahoo.co.uk> wrote:

> I'm getting the occasional, but increasingly more frequent, case where I end up with a file twice the size I'm expecting, and which claims to be 317 kbps.  I presume this is something at the BBC end, but what - and is there a solution/patch that I'm missing in my configuration? 
> 
> Example: this morning's Ken Bruce show weighs in at approx 374 Mb whereas yesterday's was around 149.
> 
> 
> $ get_iplayer  --type=radio,tv  "ken b" --sin=8 --i | grep size
> modesizes:      default: flashaaclow1=53MB,flashaacstd1=141MB,rtspaaclow1=53MB,rtspaacstd1=141MB,wma1=105MB
> 
> $ get_iplayer  --type=radio,tv  "ken b" --sin=8 --get --force
> get_iplayer 2.86-2-g969bd34-ppa17, Copyright (C) 2008-2010 Phil Lewis
> This program comes with ABSOLUTELY NO WARRANTY; for details use --warranty.
> This is free software, and you are welcome to redistribute it under certain
> conditions; use --conditions for details.
> 
> Matches:
> 11614:    radio, Ken Bruce - Patrick Kielty chooses the Tracks of My Years, BBC Radio 2, Entertainment,Music,Radio
> 
> INFO: 1 Matching Programmes
> INFO: Checking existence of default version
> INFO: flashaacstd1,flashaaclow1 modes will be tried for version default
> INFO: Trying flashaacstd1 mode to record radio: Ken Bruce - Patrick Kielty chooses the Tracks of My Years
> INFO: File name prefix = Ken_Bruce_-_Patrick_Kielty_chooses_the_Tracks_of_My_Years_b0460sxj_default                 
> RTMPDump v2.4-n78-git3a1e20c-ppa8~lucid
> (c) 2010 Andrej Stepanchuk, Howard Chu, The Flvstreamer Team; license: GPL
> Connecting ...
> INFO: Connected...
> Starting download at: 0.000 kB
> INFO: Metadata:
> INFO:   duration              9299.66
> INFO:   moovPosition          36.00
> INFO:   audiocodecid          mp4a
> INFO:   aacaot                2.00
> INFO:   audiosamplerate       44100.00
> INFO:   audiochannels         2.00
> INFO: tags:
> INFO:   ©too                 Lavf54.29.104
> INFO: trackinfo:
> INFO:   length                410115072.00
> INFO:   timescale             44100.00
> INFO:   language              und
> INFO: sampledescription:
> INFO:   sampletype            mp4a
> 367179.551 kB / 9299.64 sec (99.9%)
> Download complete
> ffmpeg version git-N-30582-gef28c7b, Copyright (c) 2000-2011 the FFmpeg developers
> built on Jun  6 2011 15:24:53 with gcc 4.4.3
> configuration: --prefix=/usr --datadir=/usr/share/ffmpeg-extra --enable-static --disable-shared --enable-gpl --enable-version3 --enable-pic --enable-runtime-cpudetect --enable-bzlib --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libschroedinger --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-decoder=aac --enable-decoder=aac_latm --enable-encoder=aac
> libavutil    51.  6. 0 / 51.  6. 0
> libavcodec   53.  6. 1 / 53.  6. 1
> libavformat  53.  2. 0 / 53.  2. 0
> libavdevice  53.  1. 1 / 53.  1. 1
> libavfilter   2. 14. 0 /  2. 14. 0
> libswscale    0. 14. 1 /  0. 14. 1
> libpostproc  51.  2. 0 / 51.  2. 0
> [flv @ 0x93bd360] max_analyze_duration 5000000 reached at 5014000
> [flv @ 0x93bd360] Estimating duration from bitrate, this may be inaccurate
> Input #0, flv, from '/media/DATA/recordings/Ken_Bruce_-_Patrick_Kielty_chooses_the_Tracks_of_My_Years_b0460sxj_default.partial.m4a.flv':
> Metadata:
>   duration        : 9300
>   moovPosition    : 36
>   audiocodecid    : mp4a
>   aacaot          : 2
>   audiosamplerate : 44100
>   audiochannels   : 2
> Duration: 02:34:59.66, start: 0.000000, bitrate: N/A
>   Stream #0.0: Audio: aac, 44100 Hz, stereo, s16
> Output #0, ipod, to '/media/DATA/recordings/Ken_Bruce_-_Patrick_Kielty_chooses_the_Tracks_of_My_Years_b0460sxj_default.partial.m4a':
> Metadata:
>   duration        : 9300
>   moovPosition    : 36
>   audiocodecid    : mp4a
>   aacaot          : 2
>   audiosamplerate : 44100
>   audiochannels   : 2
>   encoder         : Lavf53.2.0
>   Stream #0.0: Audio: aac, 44100 Hz, stereo
> Stream mapping:
> Stream #0.0 -> #0.0
> Press [q] to stop, [?] for help
> size=  366079kB time=02:34:59.66 bitrate= 322.5kbits/s    
> video:0kB audio:360530kB global headers:0kB muxing overhead 1.539135%
> INFO: Recorded /media/DATA/recordings/Ken_Bruce_-_Patrick_Kielty_chooses_the_Tracks_of_My_Years_b0460sxj_default.m4a
> 
> INFO: Downloaded Thumbnail to '/media/DATA/recordings/Ken_Bruce_-_Patrick_Kielty_chooses_the_Tracks_of_My_Years_b0460sxj_default.jpg'
> INFO: MP4 tagging M4A file
> 
> Started writing to temp file.
> Progress: =======================================================>100% |
> Finished writing to temp file.
> 
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