Vortragsaufzeichnung mit 50fps

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Es gibt ein paar Neuerungen zum Aufbau im Beitrag Vortragsaufzeichnung und Videostreaming im Eigenbau.

Nvidia arbeitet mit OBS zusammen und hatte Anfangs Jahr ihren Encoder NVENC überarbeitet. Die Grafikkarte kümmert sich ums Videoencoding, wobei die Qualität dem CPU-Rendering ebenbürtig ist.

„Vor 4k kommen zuerst 50 Bilder pro Sekunde“ hatte ich im Hackerfunk noch gesagt und nie damit gerechnet, dass dieser Quantensprung mit minimalen Materialerweiterungen plötzlich greifbar ist. Vor einem Jahr hätte es dazu wohl eine AMD Threadripper 32-Core CPU mit Starkstromanschluss und Stickstoffkühlung gebraucht. Mit dem neuen NVENC? Eine passiv-gekühlte 1050-Ti Grafikkarte reicht.

Und die:

• dekodiert zwei 50fps H.264-Kamerastreams
• dekodiert einen MJPEG-Slides-Stream
• kodiert einen Recording-Stream in höchster Qualität (2-pass Encoding, gemäss Angaben von OBS)
• kodiert einen Livestream in niedriger Qualität

2x 2-pass Encoding mit 50fps und 3 Decodes, und die CPU langweilt sich dabei.
Wir spielten zum Test ein 4k 50fps-Video als 1080p50 Livestream über LTE ab und es läuft butterweich. Durch das Max Quality Preset (2-Pass Encoding) sieht der Stream auch in der schlechtesten Qualitätseinstellung (CQP 30) noch gut aus. Hammerelefantös!

Das aufgemotzte System hat sich am diesjährigen Cosin bewährt und läuft bockstabil, die Vortragsvideos sind ultraflutschig und lassen alle 25fps Videos wie eine Diavorführung aussehen.

Videos

Kurzzusammenschnitt von 50fps Vortragsvideos: 50fps-compilation.mp4
Alle Vortragsaufzeichnungen: Cosin 2019 auf media.ccc.de

Bitte macht >50 Bilder pro Sekunde zum neuen Videostandard.

Der Grössenzuwachs ist minim. Eine Minute 25fps Video belegt 13,6MB.
Das gleiche Video mit 50fps belegt 14MB (!).
Die doppelte Framerate braucht nur 3% mehr Speicherplatz!

Die Referenten wirken mit 50fps jedoch viel lebendiger und organischer, selbst schnelle Bewegungen fängt die Kamera problemlos ein. Wenn sich nichts bewegt, muss auch nichts gespeichert werden; ob mit 25 oder mit 50 Bildern pro Sekunde. Die Codecs sind gut, Speicherplatz ist günstig.

OBS-Einstellungen für 50fps H.264 NVENC

Materialerweiterungen

• Palit GeForce GTX 1050 Ti
• MPEG4 HDMI Video Encoder H.264