Re: Question on V4L sound in CVS

Bart Kerver <[email protected]> Fri, 21 Mar 2003 10:41:55 +0100

Newsgroups	gmane.comp.video.videolan.vls.devel
Message-ID	<[email protected]>

Eric,

>>It seems to be that the sound is sampled at a lower (say 32Khz) and is
>>being played back on a different samplerate (say 44 Khz). Therefore the
>>pitch of the sound is higher and there are hickups. I rememeber that the
>>BT878 had some problem with 44Khz. I configured the VLC client to change
>>the playback speed at 32Khz, and the sound seemed to improve.
> 
> 
>  I didn't have such issues up to now. You can modify the samplerate in VLS 
> with the latest CVS thanks to Philippe Jouguet's patch, could you check if it 
> can actually fix your problem ?

Thanks for the new feature/patches, all has been patched, but it doesn't 
work (yet). If you like I can start a multicast so you can see and 
hear/see it yourself too?

Source in use:
CVS VLS - this morging (21/03/03)
CVS ffmpeg - wednesday (19/03/03)

hardware in use:
Haupage WinTV PCI FM BT878 (using cable-input)

---------
vls: configure --enable-vls --with-ffmpeg=/usr/local/src/ffmpeg... 
--enable-debug

configfile attached

VLC version: 0.5.2
-1- tested VLC with audio settings configured just like VLS (tested with 
16KHz upto 48Khz)

-2- with VLS: i tried mp2 mp3 and ogg and all the samplerates.
---------

The only (strange?) message VLS gives is:
"sample rate 32000 not supported" - though 44100 has been configured...

I have looked into the source, this might have to do with ffmpeg (could 
that be?)

Regards,
Bart


-- 
Bart Kerver

SURFnet bv - dep. Innovation Management
phone : +31 (0)30 2 305 373
fax   : +31 (0)30 2 305 329
web   : http://www.surfnet.nl/en/

vls.cfg (text/plain, 3.1 KB)

# vls configuration file (Example)

# Application wide settings
BEGIN "Vls"
  LogFile       = "vls.log"             # log file
  ScreenLog     = "enable"              # log to the console
  SystemLog     = "disable"             # log to the systemlog
END 

# Security informations :
BEGIN "Groups"
  monitor       = "help|browse|logout"
  master        = "help|browse|start|logout|program|input|channel|show"
END

# The section "Users" describes each user
BEGIN "Users"
  monitor       = "3BcKWoiQn0vi6:monitor"       # password is 'monitor'
  bozo          = "JKg2TpPerilnw:master"        # password is 'bozo'
END

BEGIN "Interfaces"
  Telnet	= "telnet"                # Port to use for that purpose
END


# Telnet Administration
BEGIN "Telnet"
  LocalPort     = "9999"                # Port to use for that purpose
  Use = "true"
END

# Streams sources declaration
BEGIN "Inputs"
  local1       = "local"               # Local input example
  tuner	= "v4l"			# Video For Linux example (composite)
END

BEGIN "Input"
  ProgramCount = "1"
END


# Video For Linux (V4L) configuration
BEGIN "tuner"
Device        = "/dev/video0"     # Video4linux device (default is /dev/video)
Channel       = "0"              # Channel Source: Webcam often 0
                                 # For TV Card, may be Tuner(0), Composite(1),
                                 # Svideo(2)
# Frequency     = "7668"           # Frequency (Mhz) * 16
Norm          = "0"              # PAL=0, NTSC=1, SECAM=2
Size          = "VGA"               # Size possibilities 

                                 # - empty string : default size
                                 # - width x height
                                 # - subQCIF(128x96), QSIF(160x120),
                                 #   QCIF(176x144), SIF(320x240),
                                 #   CIF(352x288), VGA (640x480)
DeInterlace   = "0"
Compression   = "mpeg1"	         # mpeg1 or mpeg4 [experimental]
Bitrate       = "1500"            # Bitrate (approx.) in kbps
Quality       = "1.0"            # 1.0 (good) to 31.0 (bad)

AudioDevice   = "/dev/dsp1"       # Sound device (try /dev/dsp<X>
AudioCompression = "mp2"         # mp2, mp3 or ogg
AudioBitrate  = "128"             # Audio bitrate in kbps
AudioFreq     = "44100"          # 16000, 22050, 24000, 32000, 44100, 48000
AudioChannel  = "2"              # 1=mono, 2=stereo
END

# Channel (outputs) declaration
BEGIN "Channels"
  localhost     = "network"
  kers		= "network"
  multicast     = "network"
END

# Channels configuration
BEGIN "localhost"         # The client is on the same host as the server
  DstHost = "127.0.0.1"
  DstPort = "1234"
END

# Channels configuration
BEGIN "kers"         
  DstHost = "192.87.109.22"
  DstPort = "1234"
END

BEGIN "multicast"                        # multicast example
  Type    = "multicast"
  TTL     = "16"                          # Time To Live
  DstHost = "233.4.79.6"                # multicast address
  DstPort = "1234"                       # destination port
END

# Commands automatically lanched on Startup
BEGIN "LaunchOnStartUp"
  command1 = "start video multicast tuner"
END