Computer hardware including screen size: Late 2015 iMac Retina 5k 27-inch. Most of us are not software programmers therefore, getting software for your light show system is essential. The light show software breaks the song into segments, allowing you to program each channel of light to either fade, twinkle or turn on and off in each section. Get the right Light Show Software.A digital audio workstation (DAW) is an electronic device or application software used for recording, editing and producing audio files.DAWs come in a wide variety of configurations from a single software program on a laptop, to an integrated stand-alone unit, all the way to a highly complex configuration of numerous components controlled by a central computer.My 2016 MacBook Pro 15 is connected via Thunderbolt to an external 4K monitor. DVD Player 2.1 or later also fixes an audio / video sync problem where the. Facetime HD Camera.In general , if your Mac came with a DVD drive , the needed software should. 24 GB 1867 Mhz DDR3 Ram, 500GB SSD, AMD Radeon R9 M395X 4GB GPU.External devices: Rode Podcaster connected via USB. Upgraded to 9 after recording. ScreenFlow version: Recorded video with latest version of 8.
I tried downsampling the audio to 44.1Khz in Audacity and adding it back in Screenflow and that made the audio syncing issues worse. Other hypotheses are that the Rode Podcaster's audio sample rate (96Khz) isn't what Screenflow expects (Screenflow exported mp4s look to have an audio sample rate of 44.1Khz). But slowly the audio begins to drift and falls out of sync with the Facetime HD webcam footage.When I run the video file through ffmpeg with this command: "ffmpeg -y -i shopify_vsl_2.mp4 -af 'aresample=async=1000' -movflags faststart -r 30 -vsync vfr -f mp4 shopify_vsl_2_cfr.mp4" and force a constant frame rate the audio and webcam footage stay in sync much longer-but do still end up drifting.The main thing that command does is force a constant frame rate of 30 frames per second in the footage and it drops duplicate frames.My hunch is that the root of the problem is the Facetime HD camera does not maintain a constant frame rate but has a variable frame rate that changes depending on lighting and other factors. OS = Catalina (earlier) and Big Sur (now) Extremely frustrating and impossible to 100% fix.Software: ScreenFlow 9.0.5. I've (sort of) corrected the synchronisation problem by detaching the audio from the web cam frame in ScreenFlow and moving it around, but the amount of offset / desynchronization varies throughout the video. Some times the problem starts at the beginning of a recording, other times it is later in the lecture. The audio (somewhat randomly) goes out of sync during a 3 hour recording. So, I don't think the Logitech cam is the issue.Questions needing answers (pretty please):2. Logitech C920 Webcam (plugged into either a USB 2 or 3 port - haven't tested if this makes the difference).I have 4 good studio lights illuminating me so lighting is constant and I wouldn't expect the web cam to change frame rates due to lighting variations.The Apple Audio Midi setup app says the mic is working at 98GHz.** Side note: I've had the same random audio/video offset problem using the same software / hardware above, but recording me with a Nikon Z7 in video mode with a Sennheiser MKE440 stereo mike, and a Cam Link HDMI video capture device going into the Mac vis USB. Apogee Hypemic (plugged into Thunderbolt port, some times using an extension cable - haven't tested if the extension cable is the problem) Mac program for promo videoTo start with test using only the C920 Video and Audio and remove all other video and audio sources from the computer (eliminate Cam Link and Apogee) and just see how a single USB video/audio source with the same signal path (that's the C920).After doing that test, remove even the C920 and test with built in FaceTime webcam and Built in Mic. You may want to try 48kHz or 44.1kHz.For testing you really want to eliminate variables. Todd Ehlers said:I've been recording lectures the last 4 months, and in the last weeks I started having this problem (I didn't have it before).Can you tie it to a specific change if it's only in the last weeks?This doesn't look right. Should I change the Mic Hz to a lower value (down from 98 GHz) in the Audio Midi System app? I'm unclear from previous posts if this is the problem and what value to use.Update to 9.0.6 as 9.0.5 may not be Big Sur compatible. Would 1 hour be better)? For example, I'm wondering if there is a 'buffer' on the Mac/Screenflow that is getting filled after a while and the Mac is subsampling the video or audio after the buffer is filled.3. Of particular importance - I most definitely reproduced the cable configuration I had several months ago when I didn't have problems for about 30 different screen recordings.3. Many different cable connection configurations (with and without extension cables connected to the mic and web cam, and also trying different ports (USB2 or USB3 that the web cam is plugged into).2. I can't give an exact date but it should be very soon.Follow up note after trying many different configurations.The bottom line = NO SOLUTION TO the audio and video being out of sync with Screenflow v9.1. What Software Is Needed For A To Sync Audio With Video Mac OS Big SurPlease release the version of Screenflow ASAP. I am usingSecreenflow Version 9.0.6 (31673) (not 9.0.8) and Big Sur v.11.1 and the audio and video in Screenflow are out of sync (by different amounts throughout the S. 11.1, or visa versa).I hope the Telestream fixes this problem soon - there is nothing left to do on my end unless someone else has found a solution (?)Correction to my previous post which had a typo. The only remaining possible solution is my upgrade to Mac OS Big Sur changed how Screenflow interacts with the computer hardware.These tests narrow down the problem to now being with Screenflow v9.0.8 (and it's compatibility with Big Sur v. Some other uses suggested this worked, but it made no difference aside from that the audio and video were in sync for the first 2 minutes, but then were out of sync after 10 mins.4. I conducted a clap test to see if there was still a sync problem between the video and audio.Note - this test (and based on all the other tests described above) was designed to isolate if the audio-video sync problem in ScreenFlow is due to BigSur and ScreenFlow v9.0.6.Results of the test were that there is still a sync problem between Catalina v. I used the same hardware (Apogee Mic, Logitech C920 cam, as mentioned above when I noticed the problem on MacBook Pro) as I was using before and connected it directly to the Mac mini ports (no extension cables used). I installed the current version of Screenflow version from the App Store (v9.0.6). The screen flow version I purchased and have now is not really useable and students complain it's distracting to be out of sync.I was able to find an older Mac (Mac mini 2018 6-core intel) in the lab that had not yet been upgraded to macOS Big Sur and was running Catalina v10.15.7. Big Sur was released last fall and this should have been fixed by Telestream already if the problem is really related to compatibility with the Mac OS (which was available to software developers long before released to me).If you have a Beta version of Screenflow 9.0.7 I would gladly use that until the official version is pushed out. I'm considering switching to other software (Windows) if this isn't fixed soon. In looking at the all the recordings I've made weekly since July, t he sync problem between audio and video only started occurring for me after the Screenflow 9.0.6 release in Dec. 17, 2020 for M1 Mac compatability. Screenflow v9.0.6 was released on Dec. Current version of ScreenFlow 9.0.6 is useless on my Intel Mac if including a 'talking head' (which is why many of us buy screen flow rather than recording audio directly in powerpoint). It appears they did not test the 9.0.6 version on Intel Macs well enough before releasing it. There is no way around this problem until this bug is fixed by Telestream unless the older v9.0.5 of screen flow is made available to us (which I would welcome). It doesn't matter if you running macOS Catalina or BigSur - you may have this sync problem.
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