Differences

This shows you the differences between two versions of the page.

--- erfavoc [2019/03/12 11:31] – derpeter
+++ erfavoc [2020/10/29 10:57] (current) – [Framegrabber / Capture Cards] derpeter
@@ Line 1: / Line 1: @@
-= Erfa Video Setup
+= Erfa / (Hack)space Video Setup
-Live-Streaming and recording setups in CCC Erfas and Hackerspaces.
+Live-Streaming and recording setups in CCC Erfas and Hackerspaces. \\
 Recordings of these groups can be found on [[https://media.ccc.de/b/erfas]]
@@ Line 9: / Line 9: @@
   * [[erfa:muc | CCC München]]
   * [[https://scratchbook.ch/2019/01/vortragsaufzeichnung-und-videostreaming-im-eigenbau/|CCC Zürich]]
+  * [[https://wiki.verschwoerhaus.de/voc | Verschwörhaus Ulm]]
-== Ideas for your own Setup
+= Ideas for your own Setup
-<block box info round centeralign 90% center :en>
-The following content needs to be updated, please do not use this as a blueprint without talking to us
-</block>
 == Design Goals
 A hard- and software collection that can be used entirely or in peaces for small to midsize events in hacker-spaces / erfas. \\
 It should be aligned with the best practices worked out in the operation of c3voc but be a more cost efficient solution. \\
-It also should be modular that it can be tailored to the needs and budgets of user. \\
+We will list here only components we tested / use our self. This doesn't mean you can't use other components, its just an blueprint. \\
+It also should be modular that it can be tailored to the needs and budgets of user and already existing components can be integrated. \\
 In the following we list the main building blocks an make some suggestions what could be used.
 *  FullHD Video recording
@@ Line 25: / Line 25: @@
   *  Slides via "Framegrabber"  => [[erfavoc#framegrabber]]
   *  At least one Kamera => [[erfavoc#camera]]
-* Capture Audio
+* Capture Audio => [[erfavoc#audio]]
   *  Headset + hand mic
   *  Audio mixer (optional)
-*  Postprocessing support to publishing on media.ccc.de and optional other platforms
+*  Postprocessing support to publishing on media.ccc.de and optional other platforms => [[erfavoc#publishing]]
-  *  without fuse recording  => tracker import recording worker
+  * without fuse recording  => tracker import recording worker
   * with full tracker stack  => normal tracker chain
-[[ erfavoc-old | alter Seite ]]
+[[ erfavoc-old | old page (ger) ]]
-== Idee
+== Camera
+There are numerous options for cameras depending on your budget. In most situations we recommend to feed you audio into the camera via XLR. This has two main advantages, one it that you audio will be in sync with the video all the time,
+the other is that you have a backup of audio and video on the SD card of your cam. Also using SDI to connect the camera to your video mixer is a much more stable and reliable solution than e.g. HDMI. Therefore the following points should be taken into concern when buying a cam.
+  * Audio in (preferable XLR)
+  * Video out (preferable SDI)
+  * SD card recording (much cheaper than other solutions)
+  * A wide-aperture lens (if you don't have a professional light setup)
-Die Idee ist ein Setup zu zusammen zu stellen welches FullHD Recordings und Streaming ermöglicht.
+In most cases this will lead you to semi- / professional cameras which can be expensive. It may be a good option to look for used ones. A entrance level cam is the [[hardware:hm-200e]] which sadly has not the best lens but has a reasonable price.
-Dabei sollen Komponenten vorgeschlagen werden welche erprobt sind und es ermöglichen Vorträge mit
+A much better lens can be found in many Panasonic cams like [[hardware:ag-ac-160-eej]] which you probably can buy second hand.
-einer guten Qualität von Bild und Ton ermöglicht. Weiter dient dieses Projekt dazu mehr Mitgliedern
-den Zugang zu dieser Technologie zu ermöglichen um Forschung zu ermöglichen.
-Der Vorschlag ist modular aufgebaut und setzt wenn möglich auf Komponenten welche ggf schon im
+A list of cameras which are also suitable to some extend can be found in our [[distributed-conference]] page.
-Erfa verfügbar sind.
-Da engere zusammenarbeit der Erfas welche Vorträge veranstalten und dem VOC team soll dafür sorgen das vor
-allem bei der Nachberarbeitung und dem Veröffentlichen auf bestehende Tools zurück gegeriffen werden kann.
-== Camera
+== Audio
+In most situations a headset results in the best audio quality, especially with untrained speakers. As the speaker don't alternates the distance between mic and mouth this also makes it easier for the audio mixer operator.
+In our experience most speakers prefer a headset because it keeps there hands free.
-== Audio Technik
+For question from the audience and moderation purposes a hand mic is a useful addition to the headset.
-Ein Headset ist in den meisten fällen für den Speaker am angenehmsten zu tragen da er die Hände frei hat.
-Gerade ungeübte Sprecher haben oft Probleme ein Stabmikrofon konstant gleich zu halten.
-Da Publikumsfragen ein wichtiger Teil eines Vortrags sind macht sich darüber hinaus ein Handmikrofon fürs Publikum gut.
+Depending on the budget a audio mixer is a useful addition to the setup. Especially if audio from the presenter laptop should be included.
+If a camera without audio input is used, a mixer with build-in sound card can be very useful. Our recommendation is to feed the output of the mixer (or of the two mic's) into the camera, preferable via XLR).
-An die vorgeschlagen Kamera lassen sich zwei Mikrofone direkt anschließen ein Audiomischer ist daher nicht zwingend notwendig
+If it is in the budget, digital mixers can be a good addition to the setups. For references what is used by us have a look at [[hardware:audiocase]].
-bietet aber durch aus Vorteile und sollte bei nicht zu engem Budget auch angeschafft werden.
-== Encoding / Recording / Mischen
+== Encoding / Recording / Mixing
-Dies kann alles in einem PC erfolge wenn genug CPU vorhanden ist.
+A machine that is capable of running a software video mixer, encode the results for recording and streaming and that has capture devices is the central point of the setup.
-...
+In our setup we run voctomix on it, Open Broadcast Studio (OBS) is another alternative. We recommend to run Linux here but if you into pain windows could work for to with obs.
-== Framegrabber
+== Framegrabber / Capture Cards
+Capture cards can be either PCIe based or USB 2/3 depending on budget and use case. We use mostly blackmagic decklink [[hardware:decklink]].
+A (probably not complete) list of alternatives can be found here [[hardware:framegrabber]] . Grabbing the camera input is usualy straid forward,
+capturing slides from speaker notebooks can be quite challenging. E.g. Apple Computer tend to believe the presentation belongs to Apple so they encrypt the output, also you will run
+into hackers with there hand tailored graphic stack which output 1337x42 and you need to somehow scale that. Here are devices that can do scalling, or grabber cards that are agnostic regarding the input
+a good option.
 == Streaming
-VOC CDN can be used by all erfas/frinds just ask us :-) \\
+VOC CDN can be used by all erfas/friends just ask us :-) \\
 we can either pull a "voc default mkv" from an icecast running at your side or offer an RTMP endpoint.
-Both ways the stream will end up in our cdn and you can use our [[software:streamingwebsite]] as a frontend. This also also you to embedd the stream in your own webpage.
+Both ways the stream will end up in our cdn and you can use our [[software:streamingwebsite]] as a front-end.
+The preferred way is to just send us an pull request with your configuration.
+This also also you to embed the stream in your own webpage.
 == Publishing