Lagging or freezing picture problem using replay in Wirecast 7

Hello

We get a problem with lagging or freezing picture (as shown on the video) when we are using replay during live broadcast. The picture freezes for a very short moment (half a second or less) when we:

1. Use the replay shortcut button

2. Show the specific replay

3. The replay is over and we come back to the live picture

 

We use the following:

Mac OS X El capitan 10.11.6

Wirecast Pro 7.1.0 AND 7.3.1 (same problem) 

Macbook Pro

CPU: 2,5 GHz intel Core i7

16 GB 1600 MHz DDR3

NVIDIA GeForce GT 750M 2048 MB

Black Magic Ultra Studio Mini Recorder, driver: Desktop Video 10.8.5

Camera: Canon XA25

Internet: Ethernet cable connection 100 Mb/s upload AND 100 Mb/s download

OVP: Solidtango

 

Streaming settings in Wirecast:

 

Video encoding: 

MainConcept H.264

1280

720

FPS: 25

1500 kbit/sec

Profile: Baseline

Ref pict frame each: 48 frames

Timecode each: 25 frames

Strict constant bitrate

Keypict modified

 

Audio encoding:

Stereo

128 kbit/sec

48 000 kHz

 

Recording settings:

Video:

MainConcept H.264

1280

720

FPS: 25

2025 kbit/sec

Profile: Main

Ref pict frame each: 48 frames

Timecode each: 25 frames

Strict constant bitrate

Keypict modified

 

Audio:

Stereo

128 kbit/sec

48 000 kHz

 

Wirecast output statistics:

CPU: 60-70 procent

usually green and sometimes yellow bar

fps: 25

dropped frames: we use to get up to 300 dropped frames in the first minutes and then it stops

 

Wirecast preference settings:

25 fps

live icons: off

Live icons fps: 1

 

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  • You have to stay up to date with Wirecast as updates includes fixes. Please update to Wirecast 7.5 and create a New Document and test.

    I'd also strongly recommend you use Apple H.264 and not MainConcept so for greater CPU efficiency (lower CPU%) for streaming. If you use Apple ProRes to record you can lower it even further. 

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  • CraigS 

    First we updated to Wirecast 7.5 and created a new document.

    Then we changed to Apple H.264 in the encoding settings and that made the picture flicker every 10 seconds in Solidtango. Do you know why? That obviously will not work for us. We also used Apple ProRes to record but that created too large .mov files, the files are too big even though we tried different types av quality (medium, small and the smallest). Do you think our replay problem has anything to do with CPU%? Is there anything else we can try?

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  • Jonatan Bergöö Perhaps you have an issue with your internet connection if it goes to yellow.

    Apple ProRes files are large but they use much less CPU than H.264. ProRes is standard for Post Production workflow. It's what I use to edit highlight reels. You should use a fast external drive for that 7200rpm or SSD and either USB3 or Thudnerbolt.

    Your upload speed should be twice your streaming encoder settings. You should also test packet loss which should always be 0%.

    You may want to test a local ProRes recording only. If that looks good than it could be an internet connection issue.

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  • Jonatan Bergöö  Did you work out the issue to this as I am seeing the exact problem. Even when not streaming or recording to disc,  just one camera or video clip on the time line... pressing the update replay shot button with cause the program window to drop 2-6 frames - same as shown in your video. Running WC7.7.0
    iOS 10.12.5 - iMac 4GHz i7 16GB Memory.

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  • Marcus Jones can you provide a screen recording so I can see your workflow? I'd like to see your Wirecast interface in operation.

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