Sound problem in edited videos

barnsbury

Member
I am using the latest version of VRD in Win 10.

I am experiencing issues with some 1080p videos that I recorded with a Panasonic video camera. The original mts file back fine but if I join/combine them in VRD - the edited file has issues. The same happens if I edit the files only.

When playing back the edited file in VLC it wont seek to the required position, it hangs for a long time before it will play again. The PotPlayer, the video does seek but there is no sound for 5 seconds as the video plays, then the sound comes back.

If I playback in WMP, the same issues happen - it hangs if I FF seek the file, it hangs for a long time.

Hope someone can help
 

Dan203

Senior Developer
Staff member
Can you post the MediaInfo for one of these files?

I suspect they're using AAC LATM. AAC LATM has a sort of trick where the header of an audio frame can just say "I'm just like the last frame" instead of containing the info needed to decode it. Unfortunately if that's used too frequently then when you seek you might seek to one of these frames but the decoder has no idea what the "last frame" was. So it has to just ignore all the audio frames like this until it hits one with a full header. In most cases these are close enough together that this isn’t really an issue, but I have seen some devices that use these for several seconds which results in what you're seeing.

Although that's just a guess there are other things that could cause this, so posting the MediaInfo would help.
 

Dan203

Senior Developer
Staff member
Ok definitely not the audio in that file. My guess was wrong. Nothing about that file should be an issue.

Do me a favor... go into the thumbnail settings and set the option to show the frame type. Then go to the navigation settings and set the Shift+Right Arrow to "next I frame". Now in the video jump to the first IDR frame, note the timestamp, then click Shift+Right until you get to another IDR frame. How much time was between them?
 

Dan203

Senior Developer
Staff member
H Dan

I did as you suggested. The time frame between IDR frames is 24 seconds
That's not that bad. I honestly can’t think of anything based on the info you've provided that would cause this issue. You'll need to send us an email to support AT videoredo.com so we can get a sample from you and check it out on a deeper level.
 
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