Package: gstreamer0.10-plugins-good Version: 0.10.22-1 Severity: minor If an element upstream of vorbisenc offers a stereo audio stream with channel-position specifiers in its caps, then vorbisenc seems to refuse this, and the stream downgrades to mono.
This is particularly apparent when you're transcoding A52 audio: the a52 element provides channel locations for stereo streams. I've A52-encoded a shortish audio file[1]. If you run the pipeline gst-launch \ filesrc location=test.ac3 ! \ a52dec ! \ wavenc ! \ filesink location=test.wav you get a stereo WAV file. (This is why I'm blaming vorbisenc and not a52dec.) Now, try gst-launch \ filesrc location=test.ac3 ! \ a52dec ! \ vorbisenc quality=.5 ! \ oggmux ! \ filesink location=test.ogg and you get a mono Ogg/Vorbis file. My test A52-encoded file, `dot' files from the above pipelines, and PDFs generated from them showing the caps negotiated at the various pads, are available at http://www.distorted.org.uk/~mdw/au/gstreamer-mono-bug/ The test.ac3 file is 1.3MB, so I thought it better to do this than attach it. I've set the severity to `minor' because I have a workaround, which is to detect this situation and supply explicit caps forcing `channels = 2' and stripping the position information. [1] It's currently my mobile phone ringtone. I composed, performed, programmed, recorded and edited the piece to create this `ringtone edit'. I hereby make it available under a Creative Commons Attribution/Share-Alike licence: http://creativecommons.org/licenses/by-sa/3.0/ -- System Information: Debian Release: squeeze/sid APT prefers testing APT policy: (990, 'testing'), (500, 'unstable') Architecture: i386 (i686) Kernel: Linux 2.6.31.9 (PREEMPT) Locale: LANG=en_GB.utf8, LC_CTYPE=en_GB.utf8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/bash Versions of packages gstreamer0.10-plugins-good depends on: ii gconf2 2.28.1-3 GNOME configuration database syste ii gstreamer0.10-plugins-b 0.10.29-4 GStreamer plugins from the "base" ii libaa1 1.4p5-38 ascii art library ii libavc1394-0 0.5.3-1+b2 control IEEE 1394 audio/video devi ii libbz2-1.0 1.0.5-4 high-quality block-sorting file co ii libc6 2.11.1-3 Embedded GNU C Library: Shared lib ii libcaca0 0.99.beta17-1 colour ASCII art library ii libcairo2 1.8.10-4 The Cairo 2D vector graphics libra ii libdv4 1.0.0-2 software library for DV format dig ii libflac8 1.2.1-2+b1 Free Lossless Audio Codec - runtim ii libgcc1 1:4.4.4-1 GCC support library ii libgconf2-4 2.28.1-3 GNOME configuration database syste ii libglib2.0-0 2.24.1-1 The GLib library of C routines ii libgstreamer-plugins-ba 0.10.29-4 GStreamer libraries from the "base ii libgstreamer0.10-0 0.10.29-1 Core GStreamer libraries and eleme ii libgtk2.0-0 2.20.1-1 The GTK+ graphical user interface ii libgudev-1.0-0 157-1 GObject-based wrapper library for ii libiec61883-0 1.2.0-0.1 an partial implementation of IEC 6 ii libjpeg62 6b-16.1 The Independent JPEG Group's JPEG ii liboil0.3 0.3.17-1 Library of Optimized Inner Loops ii libpng12-0 1.2.43-1 PNG library - runtime ii libraw1394-11 2.0.5-1 library for direct access to IEEE ii libshout3 2.2.2-5+b1 MP3/Ogg Vorbis broadcast streaming ii libsoup-gnome2.4-1 2.30.1-1 an HTTP library implementation in ii libsoup2.4-1 2.30.1-1 an HTTP library implementation in ii libspeex1 1.2~rc1-1 The Speex codec runtime library ii libstdc++6 4.4.4-1 The GNU Standard C++ Library v3 ii libtag1c2a 1.6.3-1 TagLib Audio Meta-Data Library ii libv4l-0 0.8.0-1 Collection of video4linux support ii libwavpack1 4.60.1-1 an audio codec (lossy and lossless ii libx11-6 2:1.3.3-3 X11 client-side library ii libxdamage1 1:1.1.2-1 X11 damaged region extension libra ii libxext6 2:1.1.1-3 X11 miscellaneous extension librar ii libxfixes3 1:4.0.4-2 X11 miscellaneous 'fixes' extensio ii libxml2 2.7.7.dfsg-2 GNOME XML library ii zlib1g 1:1.2.3.4.dfsg-3 compression library - runtime Versions of packages gstreamer0.10-plugins-good recommends: ii gstreamer0.10-x 0.10.29-4 GStreamer plugins for X11 and Pang gstreamer0.10-plugins-good suggests no packages. -- no debconf information -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org