Hi,
i have updated our production system with using the %wav parameter with
duration=3600.0 .
When I checked recorded WAV files , I found out that duration is 40 or 80
milliseconds longer than expected:
qwavheaderdump *.wav
2011-08-21-00_00_00.wav (635054156 bytes):
riff: 'RIFF'
riff length: 635040036
riff length field should be 635054148
wave: 'WAVE'
fmt: 'fmt '
fmt length: 16
format: 1
channels: 2
sample rate: 44100
bytes/second: 176400
bytes/sample: 4
bits/sample: 16
data: 'data'
data length: 635040000
data length field should be 635054112
635054156 2011-08-21 01:00 2011-08-21-00_00_00.wav 80 ms
635054156 2011-08-21 02:00 2011-08-21-01_00_00.wav 80 ms
635054156 2011-08-21 03:00 2011-08-21-02_00_00.wav 80 ms
635054156 2011-08-21 04:00 2011-08-21-03_00_00.wav 80 ms
635054156 2011-08-21 05:00 2011-08-21-04_00_00.wav 80 ms
635047100 2011-08-21 06:00 2011-08-21-05_00_00.wav 40 ms
635054156 2011-08-21 07:00 2011-08-21-06_00_00.wav 80 ms
635054156 2011-08-21 08:00 2011-08-21-07_00_00.wav 80 ms
635054156 2011-08-21 09:00 2011-08-21-08_00_00.wav 80 ms
635054156 2011-08-21 10:00 2011-08-21-09_00_00.wav 80 ms
635047100 2011-08-21 11:00 2011-08-21-10_00_00.wav 40 ms
635054156 2011-08-21 12:00 2011-08-21-11_00_00.wav 80 ms
635054156 2011-08-21 13:00 2011-08-21-12_00_00.wav 80 ms
A local test at home using ALSA input shows 40ms missing:
liquidsoap 'output.file( %wav(stereo=true,duration=3600.), "./test_%H:%M.wav",
reopen_when={0m0s}, mksafe(alsa.input()) )'
qwavheaderdump test_14:00.wav
test_14:00.wav (635032988 bytes):
riff: 'RIFF'
riff length: 635040036
riff length field should be 635032980
wave: 'WAVE'
fmt: 'fmt '
fmt length: 16
format: 1
channels: 2
sample rate: 44100
bytes/second: 176400
bytes/sample: 4
bits/sample: 16
data: 'data'
data length: 635040000
data length field should be 635032944
if I use a source like noise() file length was tested to be correct.
At production system we use
- ALSA input source,
- some fallbacks,
- limit() and
- output.file, output.icecast and output.harbor.
Liquidsoap 1.0.0-beta3+svn (default@83addd3ddbae:20110820:100002)
our setup:
#input
radio= mksafe(input.alsa(device="pcm.liq_test"))
#define ALSA fallback
fallback_mix = mksafe(single("fallback.mp3"))
fallback_alsa = smooth_add(
normal=fallback_mix,
special=switch([
( { 0s }, mksafe(single("say:Alsa failed!")) )
])
)
#apply ALSA fallback
radio = fallback(
track_sensitive=false,
[
radio,
fallback_alsa
]
)
#silence detection
radio= fallback(
track_sensitive=false,
[
fail(),
strip_blank( length=180. , radio ) ,
mksafe(single("silence.mp3"))
]
)
#audio processing
radio=limit(radio)
#record to archive
output.file(
%wav(stereo=true, duration=3600.0),
"/mnt/archive/%Y-%m-%d/%Y-%m-%d-%H_%M_%S.wav",
reopen_when={0m0s},
mksafe(radio)
)
#icecast output
output.icecast(
%vorbis.cbr(samplerate=44100, channels=2, bitrate=160),
host="xxx", port=xxx, user="xxx", password="xxx", mount="/xxx"
description="piradio",
restart=true,
radio
)
#audio stream output
output.harbor(
mount="/xxx", protocol="http",
port=xxx, format="audio/ogg",
%vorbis.cbr(samplerate=44100, channels=2, bitrate=160),
radio
)
BR, Peter
Am 06.08.2011 00:34, schrieb Peter Retep:
> Hi,
>
> next 4 hours were encoded exactly, too!
> Excellent!
>
> BR, Peter
>
>
> Am 05.08.2011 17:35, schrieb Peter Retep:
>> Thank you!
>>
>> liquidsoap 'output.file( %wav(stereo=true,duration=3600.),
>> "./test_%H:%M.wav", reopen_when={0m0s}, mksafe(noise()) )'
>>
>> test started, it will take some hours, due to small frequencies do not work
>> safely with reopen_when.
>> I let you know about results at the earliest.
>>
>> BR, Peter
>>
>> Am 05.08.2011 17:13, schrieb Romain Beauxis:
>>> 2011/8/5 Peter Retep<[email protected]>:
>>>> Hi,
>>> Hi!
>>>
>>>> I have just found some time for retesting...
>>>>
>>>> 1)
>>>> When trying to apply the length parameter (is it called duration?), I
>>>> failed.
>>>> Could you please give me a hint how to set this parameter?
>>>>
>>>>
>>>> liquidsoap -h WAV
>>>> *** One entry in audio file formats (duration):
>>>> (no doc)
>>>> *** One entry in file decoding:
>>>> Decode as WAV any file with a correct header.
>>>> *** One entry in stream decoding:
>>>> Decode a WAV stream with an appropriate MIME type.
>>>> *** One entry in stream encoding formats:
>>>> (no doc)
>>>>
>>>> liquidsoap 'output.file( %wav(stereo=true,duration=60s), "./test_%M.wav",
>>>> reopen_when={0s-59s}, mksafe(noise()) )'
>>>> Error in encoding format at line 1, char 40-42:
>>>> complex expressions are forbidden in encoding formats.
>>>>
>>>> liquidsoap 'output.file( %wav(stereo=true,duration=60), "./test_%M.wav",
>>>> reopen_when={0s-59s}, mksafe(noise()) )'
>>>> Error in encoding format at line 1, char 40-41:
>>>> unknown parameter name or invalid parameter value.
>>>>
>>>> liquidsoap 'output.file( %wav(stereo=true,duration="60"), "./test_%M.wav",
>>>> reopen_when={0s-59s}, mksafe(noise()) )'
>>>> Error in encoding format at line 1, char 40-43:
>>>> unknown parameter name or invalid parameter value.
>>>>
>>>> liquidsoap 'output.file( %wav(stereo=true,duration="60s"), "./test_%M.wav",
>>>> reopen_when={0s-59s}, mksafe(noise()) )'
>>>> Error in encoding format at line 1, char 40-44:
>>>> unknown parameter name or invalid parameter value.
>>>>
>>>> liquidsoap 'output.file( %wav(stereo=true), duration=60s, "./test_%M.wav",
>>>> reopen_when={0s-59s}, mksafe(noise()) )'
>>>> At line 1, char 42-44: cannot apply that parameter because the function
>>>> (at line 1, char 12) has no argument labeled "duration"!
>>> It should the only only variant you have not tested:
>>> %wav(stereo=true,duration=60.)
>>> Note the dot at the end.. The param is a floating number, representing
>>> seconds.. In liq a float is differentiated from an int by the presence
>>> of the dot, which must be present even if the value is actually an
>>> integer..
>>>
>>> Romain
>>>
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>
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