Manual Sync issues in Media Tab

I recently wrote in about this for a similar issue, but this has since prevailed.

When attempting to manually sync audio and video in the media tab, the clips will randomly not remain linked. If I link them, go back into a timeline where the video already resides, it is a 50/50 chance the audio will be linked on that clip.

When writing in last time. I was told there was an issue with doing this in thumbnail mode when Live Media Preview was checked. This is no longer the only glitch. I have tried every combination of list, thumbnail, and metadata view w/ and w/o Live Media Preview enabled, and the issue remains.

Additionally, there is often no waveform being shown in the audio window. When switching from "Meters" to "Waveform", the waveform will not be shown.

Attached below is a google drive link with a resolve diagnostic log, a system report, a project DRP, and a couple files with which this issue is happening.

The Timeline in which those files reside is "Scene 1 - Selects".

https://drive.google.com/drive/folders/ ... sp=sharing

Hello,

Just touching bases. This is currently stifling the timeline of my project, so I want to make sure a developer sees it, Thank you.

I recently wrote in about this for a similar issue, but this has since prevailed. When attempting to manually sync audio and video in the media tab, the clips will randomly not remain linked. If I link them, go back into a timeline where the video already resides, it is a 50/50 chance the audio will be linked on that clip.

Just curious: what source codec is the video? What source codec is the sound? Do either of them have embedded timecode?

The video is H.264 High 4:2:2 L5.1; the audio is Linear PCM in a WAV format. Both have random timecode embedded from the devices they were recorded with, but there is no synced time code.

For some reason that I think is not well understood, Resolve doesn’t do well with files that start at zero timecode. Perhaps it’s just not happy with multiple files starting with the same timecode. It might fix things if you could stamp the files with time of creating timecode. I hope there’s a bit of freeware out that that’ll do this for you.

It's suspicious if all TC starts at zero, that could also mean there is none at all, in which case DR will count from zero. TC is not very well implemented in MP4, if you are sure there should be TC, try to re-wrap the clips into MOV. That is a fast and lossless process.

MediaInfo shows the video clips to have timecode. I selected one to look at, Sc.01.Sh20.T.03 and the time code starts at 01:18:17:16 and ends at 20:08:18:00. The corresponding audio file does not show any timecode in MediaInfo, but Resolve shows start and end timecodes.

Audio.jpg (270.6 KiB) Viewed 722 times

As the audio code does not match the picture code syncing with timecode is a no go. Also the embedded audio with the picture is so quiet as the camera was not getting a feed from the F6, syncing by waveform is not going to work, so really, your only choice is to sync to the clapperboard which I tried in the Edit page and it worked fine.

You are right about the Waveform setting in the Media page not actually showing the waveform but will still replay audio if you play or drag the playhead across it.

Thank you for taking a look at this. For clarification, I am aware there is no usable timecode or in camera audio to utilize resolves auto sync systems. I am attempting to manually link this media in the media page.

All of my clips are already in an edited timeline. When working properly, linking in the media page will automatically update the clip in all of the timelines it is being used in. For this reason, I am avoiding doing this process in the edit page.

To reiterate, I want to bring this *bug* to the developers' attention in hopes of fixing it and / or finding a viable work around in the interim. Thank you all again for your assistance.

I have the same problem (18.6) with syncing by waveform. I have a quiet camera-audio and it will accurately sync my three actor-worn LAV tracks, but WHAT do I do with the "media sync" file it creates? I cannot drag it to my timeline (which I have already edited the entire scene!) and the video clips in my timeline do NOT show the newly linked external tracks when I pick "clip attributes/audio" so what do I do?

You need to change your workflow. That may sound rude, but it's the right approach.
Sync first, then start editing by loading the synced footage into the source window, marking your cut points and getting it into the timeline by clicking on the proper icon or using a keyboard shortcut.

I've been wondering why people are editing before syncing their audio.

At my shop, here are the rules for the edit assistant:
Bring in all the footage.
Double check the file names don't duplicate
Double check the timecodes are unique
Try auto sync. If that doesn't work, then manual sync.
Double check the sync on EVERY clip that you have worked on.
Send to deliver page for transcodes processing.
Open in Avid and check clips.

I'm with you, editing before syncing is pretty ridiculous. It makes no sense, since syncing ahead of time is so much easier, especially if you have good set protocol and timecode or decent scratch track.

Syncing after the fact is a lot of pointless extra work. And it also hoses your handoff to other departments...

Syncing after the fact is a lot of pointless extra work. And it also hoses your handoff to other departments...

I suppose it depends on what you’re shooting. I’d argue that syncing hours of shots you’ll never use as pointless extra work.

Good Luck