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 Forum index » Advanced Topics » Additional Software (PETs, n' stuff) » Multimedia
pulseaudio (+ xvidcap)
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Joined: 20 May 2005
Posts: 3105
Location: near Woof (Germany) :-) Acer Laptop emachines 2 GB RAM AMD64. franco-/germanophone, +/- anglophone

PostPosted: Sat 08 Jul 2017, 04:28    Post subject:  pulseaudio (+ xvidcap)  


I did have yesterday an really important need to record the G20 concert in Hamburg, but not in Hamburg, because I am not there: from TV.

The concert did be sent as "Live Stream" with the G20 news. It was not known before. On no TV program announcement, because of secret, because it was probably not certain if all personalities would agree and appear (Mrs Putin for ex. did meet at the concert hall Elbphilarmonie after the conductor did start with playing), copyrights, live streams are sometimes excepted of them, etc.

For this reason I did begin to check and prepare my PC only really a few time before the begin.

I have actually a lot of Puppies on the HD as well as Ubuntu 16.04 and Debian 9.0.

No one did record correctly: sound alone was present Rolling Eyes and more video without sound often more Embarassed ...

I did meet a lot of problems and a lot of deception (because bad preparation, ok, but in other matters the computer use happens spontaneous and directly! Why not in sound and music?

Problem No. 1:

(For me) the help in matter pulseaudio is very cryptic. Although the job is very easy

- connect the TV live stream (on a separate Seamonkey mini-window) with pulseaudio as sound source

- connect the Xvidcap recording software with it as pulseaudio sound destinaton

and start!

How to do that? Only that? I suppose 2 lines of CLI commands would be enough Mad

Problem No. 2:

to do that, how to install Pulseaudio correctly Rolling Eyes .

how to install really correctly Pulseaudio? If I understand correctly the man page (my English is very bad! It can be the reason of bad comprehension) of Pulseaudio, it can happen directly in commando line with imperative other tools?

today, synaptic is not the best help any more, different as in the past, because some software have a terrible among of option (not sure? look at python please...) and, as first user, you have definitively not the knowledge to decide which ones, or, if not, why! Debian with the split collection of software parts for one job is now a time killer no. one! Puppy packages are often better: the are mostly containers for all that you need for a job!

Problem No. 3:

How to test after starting the recording? You are confronted with different sounds: The live stream and eventually the sound of mplayer (or other player you prefer! I prefer my old mplayer...).

Problem No. 4:

To do that, you will perhaps / probably try to open new app's / little windows for testing. As the window manager and different presettings decide where the will arrive on the screen, be afraid that some one will probably arrive on the window you are recording and be recorded if within the red surface select to record in Xvidcap: all that arrives into the video

Testing is a real problem because that the TV has to manage the sound dynamic and changes the sound level to adapt it to the small level of spoken voices at interview time and of great differences of music at concert time: If you use the level of sound at interview time, you will probably be highly desapointed by the level of running music at concert time!

Problem No. 5:

as well as black screens, more beautiful waiting screen decoration after divers time (and you have to be present to reactivate the screen, if your window manager and energy saving is not prepared adequate!)

Problem No. 6

the recording time was long (the full Beethoven's symphony No. 9 + about the same time to wait since the announced official time for the concert and the real begin: The big animals of our world was absolutely not at time!) and I did have a short application interruption... without to recognize that correctly at time (I was at the normal TV in the next room to see the concert in higher quality compared with Laptop!).

Problem No. 7

more problems are possible espec. because of No. 6:

if you record from microphone input (Puppy, usually, excepted if you did install correctly and start correctly Pulseaudio)

noice and mutual reaction of both (the live stream did arrive a few second after the TV sound probably because digital, data packages have to be sended, received and convert into analogic sounds, the TV I use is always analogic) as both can be listen by the microphone

Problem No. 8

after 1,8 GB, nothing more... the rest of the Concert is loose (starting at right time, it would be enough, but we did wait as long for the big animals as the symphonie time!)

Wow, I did learn a lot about live recording in this occasion...

Is somebody here able to explain how to remedy to the one or the other problem (in Puppy or Ubuntu/Debian/Slackware)?

This time, the occasion to record is away (and will probably never more appear in my life: No G20 any more will be invited to look the concert where our child is playing as instrumental solo virtuoso (the pretty girl playing bassoon for those seeing perhaps the concert in the news streams)! Play in front of all biggest animals of the world is a really exceptional matter (this time, she and we can only hope an other parent did have more success and did belong to make a good private recording. As they were more that 100 participants including singers etc. we can hope)! But in other cases also it would be, of course, really useful to be able to mastering the business of recording! Sometimes she plays solo chamber music. There are only 4..10 participants. But for us, parents, all video records are of course important (for reason of copyrights, it is usually not possible to get a great quantity of records. I have private records for the Maas from Bernstein, an exceptionally music work, greatest, with as major singer one of the men prefered by Bernstein itself, and a record of Verdi's fantastic (for bassoon people espec.!) Missa de requiem, made by a college from orchestra being not only musician but also sound engineer, good sound engineer are often also perfect musicians. But there are only 2 records (without video, only sound, but about perfect recording; TV capture is of course maximal because a professional sound engineer and professional videomen did prepare all the views) since our girl is adult! She is now 30 y. and play all the time in "A" orchestras, the top of German orchestra, Dusseldorf, Saarebruck and Hamburg since years now (Hamburg has 2 full professional orchestra, the National Orchestra of the Opera house and the Radio Orchestra. The Opera House from Hamburg is one of the 5 concert halls in Germany able to show the biggest classic operas and ballets, and having the machinery and stocks to present, if needing, each day a different opera, as terrible machinery and immense room for decoration and costumes are necessary. The Opera of Hamburg was initially an Opera architecture novation. The Concert Hall Elbphilarmonie now is also that in the field of concert halls. Normally it is the dedicated concert hall of the Radio orchestra. At official meetings, the National Orchestra, this year also for the burial of the chancellor Schmidt, where a lot of international personalities were present, takes the position)! Not really much...

As you see, a special Puppy live CD would be a great help for the mastering of such difficult jobs needing a really very special environment. The technical performance of RSH (RSH is musician as well as graphic specialist) 's TOPLESS or Lazy would probably help more as it use a special settings file to set up and change the settings before Puppy starts!
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Joined: 11 Apr 2012
Posts: 632
Location: Connecticut, United States

PostPosted: Sat 08 Jul 2017, 13:46    Post subject:  

very interesting! Ich verstehe! I used to work for NDR and WDR. And Hamburg is my hometown.

Live recording with Puppy in this special case you present would be a big plus if mastered!

I will look into building a dedicated Puppy Linux for this purpose. Although there maybe legal issues?? No matter....

I am impressed with your daughter's achievements.
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Joined: 20 May 2005
Posts: 3105
Location: near Woof (Germany) :-) Acer Laptop emachines 2 GB RAM AMD64. franco-/germanophone, +/- anglophone

PostPosted: Mon 10 Jul 2017, 16:13    Post subject:  

thank you very much rockedge
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Location: Mer méditerrannée (1 kms°)

PostPosted: Wed 16 Aug 2017, 06:53    Post subject: Audio recording with Xvidcap  

Audio recording with Xvidcap has no pulse audio choice... ?
Utiliser pulse audio sur Firefox GTK3 for TV
 Description   Pulse audio ?
 Filesize   55.5 KB
 Viewed   74 Time(s)


Passenger Pelo ! don't ask him to repair the aircraft. Don't use him as a demining dog .... pleeease.
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