![]() ![]() ScopeBox has been my tried and tested approach for > 5 years, and it preserves timecode. Save to disk via FireWire and leave the HDMI for streaming.Tapes are about $3 each on Amazon and transferring after takes time, but the main setback is sporadic dropouts during captures when every moment counts. Save to MiniDV tape and transfer afterwards.As far as I can tell, the incoming stream would have to be recompressed on the fly to some other format like H.264, which causes more CPU cycles. There’s no way to save HDV footage as HDV footage in Wirecast.Thus the saved stream is super tedious to chop and fix if it is to be synced with another track. ![]() This makes it impossible to detect drops via any kind of timecode-break detection program. Kinda makes sense, given the dropped frames. So using Record to Disk is not the right tool for raw footage at all. However for frame-precise editing and multitrack syncing of any kind, every frame is vital. Wirecast does exactly this, typically around 80% CPU usage 10 11. Dropping a few frames here or there won’t make a visible difference to the end user. In live video, performance takes priority over data integrity. Wirecast drops frames and even adjusts the frame rate on the fly 9 to serve live content.It’s also the goto workflow at Harvard University Athletics (in fact, they use two Mini Recorders and one Intensity Shuttle USB on a MBP with success)! 8 Wirecast’s Record To Disk ≠ Edit Grade Footage The solution? Thankfully now 6, unlike when it was first released in 2011 7, the Blackmagic Intensity Shuttle USB 3.0 is compatible with Macs! Both are recognized by Wirecast which means one camera can use it via HDMI as a streaming input using Desktop Video 10.5.4 (released January 5, 2016). It would probably take some tuning though to get it right, and still might not be worth it since the decompression would still result in higher CPU usage. As of Wirecast 7.0, sources now have a separate video delay feature. One way might be to pipe the video through VLC to timeshift it with the play/pause button 5, but that’s not precise enough here to say the least for starters. “Is it possible to delay the video of one source so that it’s in sync with the other?” Although Wirecast allows for an audio delay offset, there’s no “source offset” option. Note how the center cam’s video is approximately 0.5 sec behind the audio-i.e. Audio is not switched and is always taken from the closeup camera (fed from the mixer). The stationary center cam is HDV via FireWire and the panning closeup cam is uncompressed HDMI via a Blackmagic Mini Recorder. This makes the HDV FireWire feed lag slightly behind the other HDMI camera and creates an audio-video sync problem-especially when cutting/mixing with another camera live.įorums at Telestream suggest HDV video always lags uncompressed video/audio streams, but some users don’t experience significant lag when using HDV as the only source for both audio and video (probably the case for me because of the MBP’s high specs) 4. Wirecast, which takes a few milliseconds. So compressed HDV has to be decompressed by the receiving side, i.e. When the livestream source is HDV over FireWire, the camera actually compresses the video before it sends it over 1 2 3 DV video on the other hand, is at a low enough bitrate to be uncompressed. However my 2012 MacBook Pro 9,1 has only one port, and the Mini Recorder is an endpoint with no daisy chaining (why o why). If the streaming laptop had another Thunderbolt port, this would have been a no-brainer a long time ago: rock two Blackmagic Mini Recorders via Thunderbolt and call it a day. Always Ingest HDV Cams as Uncompressed HDMI Outputs Any machine with a fast, built-in or USB 3.0 SD card reader really. ![]() Since it also compares checksums of these giant video files, I suspect it spiked the CPU and caused some dropped frames-especially since Wirecast was writing to the same disk!īest to use another machine like a MacBook Air to dump SD footage. Red Giant’s neat software Offload made it really simple to transfer footage from the Sony AX100 cam. Transfer SD Card Footage with a Separate Laptop ![]() Here’s what I’d do differently next time. Little did I know, there was a lot to learn. Last May, for Chhandayan’s All-Night Concert 2015 in NYC, I cut between two cameras in the livestream for the first time.
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