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Question

audio gap at join of spanned MP4 H.264 video files

Forum|Forum|9 years ago
February 14, 2017
3 replies
3190 views

Hi folks,

I'm running the latest update of Premiere Pro CC2017,0.2 on a fairly recently built Windows 10 i7 workstation 32 Gigs of RAM and playback from a dedicated Samsung 950Pro M.2 SSD video drive.

To my horror I just discovered some short gaps of silence, a few frames long but highly noticeable, in a 5 minute long recording of a song.

These gaps exist in the last few frames of spanned clips ie. just where the camera has chopped the material into the 4GB file sizes that it likes to create.

Said gaps occur on both the video clips that I was recording and I'm sure that it's Premiere's issue because when I import the same clips into DaVinci Resolve, I get seamless playback over these same joins.

I was recording the performance on two cameras and a field recorder:

Panasonic GH4 - wireless lapel mic and short RodePro mic on top of the camera going to left and right of the stereo via a Y cable.

Sony AR7 - inbuilt microphone

Tascam DR 60 D taking out put from a small mixer

The field recorder doesn't chop the files up in the same way as the cameras, and therefore I have seamless playback.

As a professional video producer this is a serious issue.. and makes me consider jumping to Resolve and dumping Premiere altogether.

Has anyone else experienced this? It would be hardly noticeable in normal speech, unless it happened in the middle of a word, but it's super clear during music because the gap of silence is deafening.

I've logged a bug report but am surprised that Google didn't turn up a host of other people complaining about the same issue.

Best

Nigel

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This topic has been closed for replies.

W

Walt Wooton

Participating Frequently

Several years ago this happened routinely, and we all knew to concatenate the files externally before bring them in. Someone even had a little app to automate the process.

Then Adobe fixed the problem, and bringing in the first clip in a span would automatically bring in the whole shabang. That's been true until I brought in an unusually long span of about 3 hours in version 11.1.2(22).

This is using a Panasonic AG-HMC150. Imported through Media Browser, but really? What foul magic is that?

First indication of a problem was "Create Multi-Camera Source Sequence," which vomited. On inspection, it's clear why, I guess. Import no longer likes spanned clips, at least in this case.

S

SAFEHARBOR11

Participating Frequently

This is not a bug. Please use the following workflow for perfect results:

1. Copy ENTIRE contents of SD card to hard drive, not just "video" clips alone. There is other metadata/file structure from card that is helpful to Premiere to put the video back together as intended.

2. Import in Premiere using Media Browser.

The same spanned clips imported using File > Import will have audio gaps, while those brought in via Media Browser will be seamless, and in fact Premiere will show the spanned clips as one continuous clip in timeline sequence. I have brought in 3-hour AVCHD recital shots made of many spanned clips, and Premiere shows me just ONE seamless continuous clip with no dropouts.

Follow this practice and you should not have issues. Also working for me with Sony 4K clips.

Thanks

Jeff

W

Walt Wooton

Participating Frequently

"Should" is a funny word. I follow this exact workflow. It's a bug, but what triggers it is unclear. My only clue is the length of the spanned clips -- about 3 hours. In shorter spans, it works as you describe.

Walt

S

Stephen Scheibel

Participant

I will confirm this bug!

This showed up all of a sudden and I couldn't figure out why... I have wasted a lot of time trying to figure this out.

I would have never suspected software to skip over 20 frames of audio that are clearly there!!!

BY THE WAY = Thankfully I have an older version of PP (2015.3) and the problem doesn't happen there!

I am equally shocked that Adobe hasn't responded, and equally shocked there aren't more google hits on this!

shooternz

Legend

How did you import the source files to your HDD?

How did you import the source files from HDD to PPro Project?

I've logged a bug report but am surprised that Google didn't turn up a host of other people complaining about the same

Why are you surprised. A true bug would mean others are affected as well as you!

Lucky you are a pro and used an external audio recorder eh.

BTW - how do the inbuilt and on board mics work for you with music recording?

nigelh24336707Author

Participating Frequently

Hi Shooternz,

Thanks for your interest.

I copied the files the same way I've always done..

1/ dragged and dropped them from the SD CARD folder to PC folder with windows file browser

2/ Dropped them into my Premiere Pro project pane from the PC folder using windows file browser

I was surprised because there must be thousands of others using Premiere Pro on a daily basis, therefore, if I stumbled across a bug in Premiere, I expect someone else will have noticed it too and to have written it up to forums like this.

The external recorder didn't save me.. I didn't particularly like the sound from the mixer output, it was very poor compared to the lapel mic which was fed into my GH4.

What saved me was Googling up this thread:

GH4 Issues topic - Personal View Talks

In which caveport gave this reply:

"The last set of spanned clips I shot on the GH4 in MOV format and imported into DaVinci Resolve, worked ok without the missing frame of audio. I have done a GH4 firmware update and FCPX update and no longer have the issue."

So I put my clips into DaVinci Resolve 12 and the gaps were gone - fully seamless joins across all spanned clips.

This is how I know that it's Premiere and not my camera causing the issue.

As for the in built vs onboard (I guess you mean the RodeVideoMicPro which I used on the hot shoe), I prefer the slightly more directional Rode because the inbuilt mic seems to be all atmospheric.

Cheers

shooternz

Legend

2/ Dropped them into my Premiere Pro project pane from the PC folder using windows file browser

Try importing them to PPro via the Premiere Media Browser

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