Linux-audio-user June 2011

linux-audio-user@lists.linuxaudio.org

116 participants
128 discussions

by Emanuel Rumpf

LASH, LADISH, JACK-Session, ... LV2 ? Which is the session handler / API to use these days ? ? Where to download current stable sources ? How to use and set up ? Is there a GUI tool to easily handle it ? Thanks. -- E.R.

13 years, 10 months

io GNU/Linux .... a multimedia live system based on Debian SID

by MK aka El Doctor

Hi there :) Better later than never... just wanted to let you know about the existence of a live dvd/usb that, I hope, may interess some linux audio adictos here :) "io GNU/Linux is a live system that turns almost any computer into a professional multimedia workstation. It includes a real-time enabled kernel and a great collection of free software for all uses (sound, video, graphics, internet and more)." http://sourceforge.net/projects/io-gnu-linux/ It's based on Debian SID and built whith the Debian Live tools. JACK2 combined with Ladish/Laditools is used as default sound server (you may need first to set up phonon to prefer JACK over Alsa for KDE related apps) Don't hesitate to give it a try and for sure, any feedback more than welcome. Hope this helps, cheers ;) MK

13 years, 10 months

Some new music

by Julien Claassen

Hello everyone! I just had an idea. It's proggy - as it is most times - and reminiscent of the 70s, which also shouldn't be much news and purely instrumental, which is a blessing. :-) http://juliencoder.de/nama/no_use.ogg http://juliencoder.de/nama/no_use.mp3 Or go to the website: http://juliencoder.de/nama/music.html Have fun and as ever I'm glad about every feedback, though I'm quite sure, this time it won't be too favourable, since there are some imperfections in there. :-) Warmly yours Julien -------- Music was my first love and it will be my last (John Miles) ======== FIND MY WEB-PROJECT AT: ======== http://ltsb.sourceforge.net the Linux TextBased Studio guide ======= AND MY PERSONAL PAGES AT: ======= http://www.juliencoder.de

13 years, 10 months

1/4" necklace

by Emanuel Rumpf

A fan souvenir for JACK Audio Fans ?? :) image: http://www.instructables.com/image/FMZMZ1GFZQ1FXLT/Make-a-14-Inch-Adaptor-N… link to instructable: http://www.instructables.com/id/Make-a-14-Inch-Adaptor-Necklace/

13 years, 10 months

hdspmixer

by Ralf Mardorf

Hi, isn't it possible to chose between +4dBu and -10dBv by hdspmixer and to set up clock mode, adat in etc.? I guess I didn't miss anything, but it's better to asked ;). I'll compile hdspconf, but IIRC somebody mentioned is doesn't work with the RME HDSPe AIO? IIRC Paul mentioned alsamixer :). Yep, 'alsamixer -g' seems to provide all that's needed, but it seems to be a little bit user-unfriendly. Thanks for the -g switch :), since I'm sitting in a room flooded with sunlight and not in a tomb. Regards, Ralf

13 years, 10 months

Re: [LAU] Jack vs. Alsa, PianoTeq demo: Alsa wins!

by James Warden

--- On Sun, 6/12/11, Aaron Krister Johnson <aaron(a)akjmusic.com> wrote: From: Aaron Krister Johnson <aaron(a)akjmusic.com> Subject: [LAU] Jack vs. Alsa, PianoTeq demo: Alsa wins! To: "Linux-audio-user" <linux-audio-user(a)lists.linuxaudio.org> Date: Sunday, June 12, 2011, 3:40 AM Hi all-- I'm wondering if anyone else has experienced this: I'm considering purchasing PianoTeq, but I wanted to try the demo. It seems to work better with just the alsa driver than it does with jack, a reversal of the usual situation. I tested this several times by playing fast glissandi on the default piano preset. Each time, my little EEE-PC netbook under jack choked with xruns and a brief silence while PianoTeq 'reset' itself, but Alsa alone chugged away with no xruns unless there was an extreme amount of load.... I'm wondering if anyone can comment on this. It seems odd, especially since the jack developers claim jack adds no latency by itself to the picture in any situation---so, do we have a situation where the code is better written for the alsa driver than for jackd? It seems we do, in this case.... Best,AKJ Hi, I am not familiar with your h/w but I am quite sure some ppl on the Pianoteq forums are using the same. Did you browse these forums ? J.

13 years, 10 months

Re: [LAU] OT - syncing partially out of sync video and audio in existing files

by pshirkey＠boosthardware.com

> Philipp <hollunder(a)lavabit.com> wrote: >> >> >> > <snip> >> > So it seems mencoder can just drop video frames. >> >> That's good to know. For references sake, what was the commandline that >> you ended up using? > > I wrote it in another post in this thread already, but here it is again: > > 1) Figure out the position at which the offset starts using mplayer. > > 2) Get the faulty part in a separate file, delay audio as necessary: > mencoder -ss 02:47:55 -oac copy -ovc copy -delay -9.55 file.avi -o > fileb.avi > > 3) Get the good part into another file: > mencoder -endpos 02:47:55 -oac copy -ovc copy file.avi -o > filea.avi > > 4) Put the parts back together again: > mencoder -oac copy -ovc copy filea.avi fileb.avi -o > filefixed.avi > > filefixed.avi is the resulting fixed file. > > What I noticed though is that it's limited in granularity, maybe it has > something to do with keyframes. In my previous case I had 13 seconds cut > out instead of 9.55, but it seems like it can be more. I know far too > little about video or mencoder to tell what's really going on. > Well, it's ok for me to loose a couple of seconds and have synced audio. > > I suspect you're not the only person who feels this tradeoff is a reasonable *default* choice. It's functionality like this that could be relatively easily added to existing software and would make a huge difference to a lot of people over the years. The problem is knowing how to achieve the goal and automating that process. Seems like you have figured out a useful commandline method. Hopefully that will get picked up and integrated into a GUI solution at some point. -- Patrick Shirkey Boost Hardware Ltd

13 years, 10 months

Getting rid of PulseAudio issues, while PA isn't installed

by Ralf Mardorf

Hi, for my Debian there's no PA installed, but anyway, when I run jackd and try to get sound for a Youtube video, there's no sound. I need to stop jackd and then I can hear the sound of the video. Some time ago somebody wrote that it should be easy to get rid of PA, while I claimed, that it's hard to do. Yes, getting rid of PA, while it's still impossible to use non-jack applications is easy. Yes, for the browser there might be flash with jackd support, but I would like to have a good old Linux, where I don't need to take care about this Pulseaudio configurations. Is it possible to get rid of any PA issues? Regards, Ralf

13 years, 10 months

RME HDSPe AIO issue, perhaps related to the firmware and driver

by Ralf Mardorf

Hi :) how do I get audio for my RME HDSPe card working? Jack already recognises the card and I already run jack_midi_latency_test getting a good result. I suspect that I need a special driver and firmware loader version. I never used a RME card before. alsa-firmware-loaders is version 1.0.23 Now I'll test other versions of alsa-firmware-loaders, but perhaps somebody knows which version is ok, reps. maybe I miss something to do ;). $ uname -a Linux debian 2.6.33.9-rt31 #1 SMP PREEMPT RT Thu Jun 2 12:42:46 CEST 2011 x86_64 GNU/Linux # hdsploader hdsploader - firmware loader for RME Hammerfall DSP cards Looking for HDSP + Multiface or Digiface cards : Card 0 : RME HDSPM MADI at 0xfdbf0000, irq 18 Card 1 : TerraTec EWX24/96 at 0xbf00, irq 20 Card 2 : TerraTec EWX24/96 at 0xbb00, irq 21 $ hdspconf HDSPConf 1.4 - Copyright (C) 2003 Thomas Charbonnel <thomas(a)undata.org> This program comes WITH ABSOLUTELY NO WARRANTY HDSPConf is free software, see the file copying for details Looking for HDSP cards : Card 0 : RME HDSPM MADI at 0xfdbf0000, irq 18 Card 1 : TerraTec EWX24/96 at 0xbf00, irq 20 Card 2 : TerraTec EWX24/96 at 0xbb00, irq 21 No Hammerfall DSP card found. $ hdspmixer HDSPMixer 1.6 - Copyright (C) 2003 Thomas Charbonnel <thomas(a)undata.org> This program comes with ABSOLUTELY NO WARRANTY HDSPMixer is free software, see the file COPYING for details Looking for HDSP cards : Card 0 : RME HDSPM MADI at 0xfdbf0000, irq 18 Card 1 : TerraTec EWX24/96 at 0xbf00, irq 20 Card 2 : TerraTec EWX24/96 at 0xbb00, irq 21 No Hammerfall DSP card found. Cheers! Ralf

13 years, 10 months

Re: [LAU] OT - syncing partially out of sync video and audio in existing files

by pshirkey＠boosthardware.com

> Excerpts from pshirkey's message of 2011-06-10 21:56:06 +0200: >> > Excerpts from Ralf Mardorf's message of 2011-06-10 19:24:54 +0200: >> >> On Fri, 2011-06-10 at 18:57 +0200, Renato wrote: >> >> > On Fri, 10 Jun 2011 17:58:46 +0200 >> >> > Philipp <hollunder(a)lavabit.com> wrote: >> >> > >> >> > > Hi, >> >> > > sorry for abusing this list for a mostly video editing question, >> but >> >> I >> >> > > didn't find a proper list and knew that we have some video people >> on >> >> > > this list. >> >> > > >> >> > > I'd like to fix some videos that have partially out of sync video >> >> and >> >> > > audio, meaning that beginning at a certain point in the video the >> >> > > audio is suddenly out of sync by a couple of seconds. There's no >> >> > > constant change, the delay seems fixed once it's there. >> >> > > >> >> > > I wonder how to fix such a thing. The files are xvid encoded >> videos >> >> > > and vbr mp3 audio inside avi containers. I thought it should be >> >> > > reasonably easy to cut and move the audio (re-encode if >> unavoidable, >> >> > > but I know it's in principle possible without) and put it back in >> a >> >> > > container, but I didn't manage. >> >> > > >> >> > > Can someone recommend a program/workflow that would allow this? >> >> > > >> >> > > I tried: >> >> > > - Avidemux: seems like actual editing is not what this program >> was >> >> > > written for, couldn't figure it out, but it seems close >> >> > > >> >> > > - openshot: couldn't figure out how to separate video/audio >> >> > > >> >> > > - kino: seems to only work with DV-files, apparently takes ages >> to >> >> > > decode the file, doesn't seem to be what I need >> >> > > >> >> > > - openmovieeditor: I figured it might work by dragging the file >> to >> >> > > both a video and an audio track, but I got extremely garbled >> audio >> >> > > output, no idea what's wrong >> >> > > >> >> > > - cinelerra-cv: Doesn't start. No error message, it simply shows >> no >> >> > > window, nothing. Well, it does something with the screen, but >> it >> >> > > shows nothing. >> >> > > >> >> > > - pitivi: Doesn't seem like it can play back the video. I can >> drag >> >> the >> >> > > video to the tracks and it starts to draw a waveform, I guess >> no >> >> > > video thumbnails because of: gst.ElementNotFoundError: pngenc >> >> > > Doesn't seem to be able to play the video. >> >> > > >> >> > > - kdenlive: would require me to install 30 additional packages, >> >> total >> >> > > about 200MB, no thanks. >> >> > > >> >> > > I thought it would be a simple task, really nothing fancy. Seems >> >> like >> >> > > I was wrong. >> >> > > >> >> > > Regards, >> >> > > Philipp >> >> > > >> >> > >> >> > Hi, unfortunately can't give you a full solution, but only a hint: >> in >> >> > mplayer with "-" and "+" you can adjust audio/video syncronization >> by >> >> > multiples of 100ms (maybe you cand do finer, but I'm not sure). >> >> > >> >> > maybe you could then somehow record the output to a new file? >> > >> > Thanks Renato, I've played with that already and know the approximate >> > offsets, but that doesn't help much. I'm not sure screen recorders >> > typically can pause and resume, and even then it would be less than >> > optimal anyway due to the transcoding of both audio and video. >> > >> > Also, to clarify, those offsets are constant but only appear beginning >> > at a certain point in the file, imaginary example: after 97 Minutes >> the >> > offset is suddenly approximately -9600ms. Hence shifting the offset of >> > the whole file doesn't help. >> > >> >> >> I went through this a couple of years back with pretty much the same >> result. The general consensus round here was that it is not possible to >> shrink a video to fit with an audio track. Instead you should stretch >> the >> audio track to fit the video. >> >> I ended up using Blender to edit the video into chunks and align chunks >> of >> audio to fit as best as possible. >> >> I don't understand why it is not possible to resize a video track. It >> seems to me that dropping video frames is significantly easier >> programatically than time stretching audio. > > I've only done this with one video so far, so I don't know whether it > works fine in general, but in this case mencoder dropped a couple of > seconds that were just black anyway, so no real loss. It was a fade out > to black and I jugged down the time the moment it was black. I somewhat > wonder how it was messed up, I suspect files were put together and some > black frames were added without caring for audio, or something like > that. Anyways, there's no loss of content with this file, which was with > almost ten seconds delay by far the worst of the bunch. Ok, according to > mplayer the file is now 13 seconds shorter instead of 9.55, but who > cares as long as the result is fine. > > So it seems mencoder can just drop video frames. That's good to know. For references sake, what was the commandline that you ended up using? > I was also surprised about the speed. I guess it took at most a minute > per operation on this old cheap laptop and ~3h video, most likely it > avoided re-encoding of anything, which is a good thing in my book. In > contrast, just loading the video into kino would probably have taken an > hour. > > Regards, > Philipp > >

13 years, 10 months

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Linux-audio-user June 2011