[MPlayer-users] mplayer not maintaining sample rate of source material when encoding to pcm

[Vladimir Mosgalin]

Hi Michael J. Carter!

 On 2011.08.02 at 21:27:09 -0600, Michael J. Carter wrote next:

> I'm trying to extract the 24/96 audio mix from a new DVD. mplayer is
> correcting the sample rate of the source, but for some reason is
> down-sampling to 16-bits when encoding to pcm:

Strange, works for me with s24le/s32le.

Try -af format=s24le and see if it helps?

Also try dumping with options
-ao pcm:file=target.wav:fast -vc none -vo null -nosub

> 
> Opening audio decoder: [dvdpcm] Uncompressed DVD/VOB LPCM audio decoder
> AUDIO: 96000 Hz, 2 ch, s24be, 4608.0 kbit/100.00% (ratio: 576000->576000)
> Selected audio codec: [dvdpcm] afm: dvdpcm (Uncompressed DVD/VOB LPCM)
> ==========================================================================
> [AO PCM] File: /home/mcarter/Desktop/dvd/Dirty_Jeans_And_Mudslide_Hymns_02_01.wav
> (WAVE)
> PCM: Samplerate: 96000Hz Channels: Stereo Format s16le
> [AO PCM] Info: Faster dumping is achieved with -benchmark -vc null -vo
> null -ao pcm:fast
> [AO PCM] Info: To write WAVE files use -ao pcm:waveheader (default).
> AO: [pcm] 96000Hz 2ch s16le (2 bytes per sample)
> 
> In my case, mplayer is being called from the 'devidify' utility. The
> system call from that python script looks like:
> 
> command = 'mplayer -quiet -dvd-device %s dvd://%s -chapter %s-%s -vc
> null -vo null -ao pcm:file="%s"' % (prefs.device, title, chapter,
> chapter, targetfile)
> 
> Is there a default that I need to override to maintain 24-bit resolution???
> 
> 
> 
> Running on Fedora 15 using the mplayer package from rpmfusion:
> 
> [root at simcoe ~]# rpm -qi mplayer
> Name        : mplayer
> Version     : 1.0
> Release     : 0.124.20110412svn.fc15
> Architecture: i686
> Install Date: Sat 16 Jul 2011 08:26:22 AM MDT
> Group       : Applications/Multimedia
> Size        : 3354248
> License     : GPLv3+
> Signature   : RSA/SHA256, Thu 30 Jun 2011 02:16:17 PM MDT, Key ID
> adc570de00a4d52b
> Source RPM  : mplayer-1.0-0.124.20110412svn.fc15.src.rpm
> Build Date  : Wed 29 Jun 2011 06:16:19 PM MDT
> Build Host  : hephaestus.wilsonet.com
> Relocations : (not relocatable)
> Packager    : <http://nonfree.rpmfusion.org/>
> Vendor      : RPM Fusion
> URL         : http://www.mplayerhq.hu/
> Summary     : Movie player playing most video formats and DVDs
> Description :
> MPlayer is a movie player that plays most MPEG, VOB, AVI, OGG/OGM,
> VIVO, ASF/WMA/WMV, QT/MOV/MP4, FLI, RM, NuppelVideo, yuv4mpeg, FILM,
> RoQ, and PVA files. You can also use it to watch VCDs, SVCDs, DVDs,
> 3ivx, RealMedia, and DivX movies.
> It supports a wide range of output drivers including X11, XVideo, DGA,
> OpenGL, SVGAlib, fbdev, AAlib, DirectFB etc. There are also nice
> antialiased shaded subtitles and OSD.
> Non-default rpmbuild options:
> --with samba:   Enable Samba (smb://) support
> --with xmms:    Enable XMMS input plugin support
> --without amr:  Disable AMR support
> --with faac:    Enable FAAC support
> --with libmad:  Enable libmad support
> --with openal:  Enable OpenAL support
> --with jack:    Enable JACK support
> --with arts:    Enable aRts support
> --with esound:  Enable EsounD support
> --with dga:     Enable DGA support
> --with directfb:Enable DirectFB support
> --with svgalib: Enable SVGAlib support
> --with nemesi:  Enable libnemesi RTSP support
> 
> 
> -- 
> Michael J. Carter
> mcarter at pobox.com
> _______________________________________________
> MPlayer-users mailing list
> MPlayer-users at mplayerhq.hu
> https://lists.mplayerhq.hu/mailman/listinfo/mplayer-users
> 

-- 

Vladimir