User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.6) Gecko/20091216 Fedora/3.5.6-1.fc12 Firefox/3.5.6 GTB6 It seems as if pulseaudio doesn't have the hooks necessary to pass dolby digital from (say) an .avi file out an hdmi cable to a digital audio tuner. For example, I have to use the following script to play a file with dolby digital w/ac3 passthrough: #!/bin/sh killall pulseaudio \ && exec mplayer -ac hwac3 -ao alsa:device=hw=0.3 \ $* Reproducible: Always Steps to Reproduce: 1. try to play back a file with ac3 passthrough using pulseaudio Actual Results: Playing South.Park.S13E09.720p.HDTV.X264-DIMENSION.mkv. [mkv] Track ID 1: video (V_MPEG4/ISO/AVC), -vid 0 [mkv] Track ID 2: audio (A_AC3), -aid 0, -alang und [mkv] Will play video track 1. Matroska file format detected. VIDEO: [avc1] 1280x720 24bpp 23.976 fps 0.0 kbps ( 0.0 kbyte/s) ========================================================================== Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264) ========================================================================== ========================================================================== Forced audio codec: hwac3 Opening audio decoder: [hwac3] AC3/DTS pass-through S/PDIF No accelerated IMDCT transform found hwac3: switched to AC3, 384000 bps, 48000 Hz AUDIO: 48000 Hz, 2 ch, ac3, 384.0 kbit/25.00% (ratio: 48000->192000) Selected audio codec: [hwac3] afm: hwac3 (AC3 through S/PDIF) ========================================================================== shm_open() failed: Permission denied AO: [pulse] 48000Hz 2ch s16le (2 bytes per sample) [format] Sample format big-endian AC3 not yet supported [libaf] Reinitialization did not work, audio filter 'format' returned error code -2 Couldn't find matching filter/ao format! Expected Results: This example is with alsa -- while it gives a warning about "unknown pcm", this does work, and the tuner recognizes and plays the DD stream. Forced audio codec: hwac3 Opening audio decoder: [hwac3] AC3/DTS pass-through S/PDIF No accelerated IMDCT transform found hwac3: switched to AC3, 384000 bps, 48000 Hz AUDIO: 48000 Hz, 2 ch, ac3, 384.0 kbit/25.00% (ratio: 48000->192000) Selected audio codec: [hwac3] afm: hwac3 (AC3 through S/PDIF) ========================================================================== [AO_ALSA] alsa-lib: conf.c:4484:(parse_args) Unknown parameter AES0 [AO_ALSA] alsa-lib: conf.c:4617:(snd_config_expand) Parse arguments error: No such file or directory [AO_ALSA] alsa-lib: pcm.c:2211:(snd_pcm_open_noupdate) Unknown PCM hw:0,3,AES0=6 AO: [alsa] 48000Hz 2ch ac3 (1 bytes per sample) Starting playback... This is my media PC, a Zotac itx mobo w/NVidia sound & video chipset. I've also had to use alsamixer > f6 > select HDA sound device > unmute second SPDIF device, to get sound (pcm or ac3) to play through the HDMI cable...but that's another issue. This is an extremely major feature of alsa that doesn't seem to exist with pulseaudio.
Upstream bug: http://www.pulseaudio.org/ticket/167 Too bad ppl seem to do not care about it :(
As AC3/DTS are basic sound features in this age and time, I guess PA's deficiency renders Fedora quite useless as an HTPC platform (say XBMC) ?
Does anybody know a workaround? I'm stuck with this... I managed to play a few files directly via alsa (mplayer -ao alsa) but the behavior seems erratic (trying several different pulseaudio settings, eventually it works, but I can't reproduce the same steps more than once). The original workaround doesn't work for me either (pulseaudio automatically respawns itself on Fedora 13): #!/bin/sh killall pulseaudio \ && exec mplayer -ac hwac3 -ao alsa:device=hw=0.3 \ $* Any idea is very welcome.
Hi Ademar, Take a look at pasuspender -- "man pasuspender" for more info. It's in the "pulseaudio-utils" package.
There are AC3 passthrough patches floating on pulseaudio mailinglist. You can help advance by testing them and providing feedback. When those patches will be good enough to be integreated in upstream PA, AC3 passthrough will came to Fedora.
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Still not integrated.
Upstream fixed it in PA 1.0.
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