A/V Sync VRD 4.21.4.671c

eustonstreet

New member
Hi, I've been using VRD for editing h264 DVB-S files for a few years & I've never had any A/V sync issues till latest version (4.21.4.671c) where the audio seems be be running slightly ahead of the video. I checked against 2 prior releases (4.21.2.662 & 4.21.3.667a) which are both pretty much perfect. Studying the audio waveform under the individual frames in the editing window suggests audio is running about 30ms ahead of video in latest 671c release. Programmes are from BBC1 HD.

Has anyone else seen this behavior?

Ian
 

phd

Super Moderator
Are you referring to AV sync issue with the source file or after editing and saving?

Can you try the latest Beta?
 

eustonstreet

New member
Are you referring to AV sync issue with the source file or after editing and saving?

Can you try the latest Beta?

The source TS file is fine, no problems there & it plays ok in editing window with no noticeable sync issues. But after editing with 671c there is a very small A/V sync issue with the saved TS file when played with Windows Media Player. It's borderline irritating! Comparing the saved files between 4.21.2.662 & 4.21.3.667a and latest 4.21.4.671c suggest to me the issue occurs about 2 seconds into the saved TS.

Sync between 4.21.2.662 & 4.21.3.667a is identical, audio is at least half a frame ahead with 4.21.4.671c.

I will try the latest beta.

Thanks

Ian
 

ricky

New member
I'm having the same problem with VRD 4.21.4.671c - saving material from an H264 transport stream as H264 WTV gives a WTV file in which the audio is slightly out of sync with the video. Earlier versions of VRD didn't have this problem, the audio would always be perfectly synced in this situation. On a related note, saving material from an H264 transport stream as H264 MP4 still produces files where the audio is out of sync by maybe half a second no matter which device the resulting file is played on. The only way I've found to work around this is to perform a full reencode but this shouldn't really be necessary given that the source material is already in H264 format :confused:
 

Danr

Administrator
Staff member
Can someone upload a source clip and a vprj to us, so we can duplicate it here?
 

ricky

New member
I have a transport stream here which shows the problem - here, the audio is perfectly in sync when the file is played directly but when I load it into VRD and then save all or part of it as H264 TS, H264 WTV or H264 MP4, the audio in the resulting file has fallen out of sync. The only problem is that the file is pretty large at 2.7GB. Is there anywhere I can FTP it to so that you can get a copy of it?
 

eustonstreet

New member
Can someone upload a source clip and a vprj to us, so we can duplicate it here?
I have uploaded a source file clip (HIGNFY Clip.ts) that exhibits the problem with 4.21.4.671c. I haven't uploaded project file as the source file would be too big.

Ian
 

Dan203

Senior Developer
Staff member
I have a transport stream here which shows the problem - here, the audio is perfectly in sync when the file is played directly but when I load it into VRD and then save all or part of it as H264 TS, H264 WTV or H264 MP4, the audio in the resulting file has fallen out of sync. The only problem is that the file is pretty large at 2.7GB. Is there anywhere I can FTP it to so that you can get a copy of it?
Send us an email at support @ videoredo.com and we will give you instructions on how to upload a large file like that.
 

ricky

New member
Any more updates on this? I've been trying old versions of VRD all the way back to 4.21.3.667a but, when I've found a transport stream which gives problems, none of the older versions of VRD seem to differ in their behaviour so the audio will always be out of sync.
 

Danr

Administrator
Staff member
Ricky, Did you email us? If don't recall seeing anything from you. I have a fix that I'm asking the users with this issue to try out, so email me at support and I'll send you you a link.

support at videoredo dot com.

Also, what country do you live in and which channel are you seeing this behavior?
 

glenpinn

Member
The source TS file is fine, no problems there & it plays ok in editing window with no noticeable sync issues.
i am using the latest beta, and i filmed an 80th birthday bash last sunday arvo, resulting in me having 5 individual avchd (m2ts) files on my hdd from that shoot, ranging between 5 and 15 minutes duration for each file.

usually with all my shoots in the past, i will dump the individual 1080/50p avchd files from my card onto my hdd, then check each file to check for any AV sync issues, and up until now, i have never had any sync issues.

i would then load all files up in VRD using the "Join" function as usual, and mux them to 1080/50p m2ts and check the output file again for any Sync issues, and again never had any issues using this as my workflow, once all files have been joined and output as a single file, i would bring it back into VRD and cut unwanted bits out, then mux again to 1080/50p m2ts as my final copy ready for archiving, again checking to see if the Audio and Video are syncing ok.

this time around i decided to do things a bit differently than before, and ended up with AV sync issues in the final m2ts file.

playing each individual file everything is fine, no sync issues, then i loaded all 5 files up in VRD using the "Join" function, i then went to the joiner list, selected the 2nd file, hit the "Edit" option, and cut 3 minutes from the end of that file, i left all the others as they were shot, and i then output (mux) the 5 files to a single 1080/50p m2ts as usual, and the resulting 50 minute file on playback starts getting minor AV sync issues from the part of the video that i cut that 3 minute segment from, continuing right up to the end of the video.

one of the guests wanted me to do a DVD of the function to show her hubby, so last night i converted the video to an mpeg2 program stream, and it too had AV sync issues so i deleted it.

just now i imported all those 5 avchd files back into VRD and joined them all first without cutting anything out, and just like my regular workflow, there is no AV sync issues with that 53 minute unedited m2ts file.

my issue now seems to be that when i revert back to my usual workflow where i import the single unedited file back into VRD and cut that 3 minute segment out and mux it back to 1080/50p m2ts, this time i get AN AV Sync issues from where i cut that segment out right thru to the end.

i have gone back to 671 and re-did my workflow, and it still has sync issues.

dont know what the problem is ? very strange.
 
Last edited:
Top Bottom