Black segments of video created on production in PD14

Canonman5D3

Newbie Location: UK Joined: Jun 26, 2016 14:17 Messages: 17 Offline

Solved by

Sep 01, 2016 12:04

I have just created a 5 min videos (640x480 1mbps) from some clips created on a video camera (1920x1080 25fps, H264, 15mbps AVCHD). The created files has a black series of frames created in it in 3 places (47, 77, 84 frames respectively), in each case coincident with a clip junction on the time line. All the clips are contigous on the time line, so no gaps exist, and not all the clip joints show this effect, only 3 out of 13.

I am running on an intel i7 mechine, cpu load is 90% during production and only 7GB of 24GB memory is utilised. Open CL is and hardware decoding are selected.

I haven't a clue where to start looking for this, any ideas?

Longedge

Senior Contributor Joined: Apr 28, 2011 15:38 Messages: 1504 Offline

Sep 01, 2016 12:30

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This message was edited 1 time. Last update was at Nov 09. 2016 10:17

Canonman5D3

Newbie Location: UK Joined: Jun 26, 2016 14:17 Messages: 17 Offline

Sep 01, 2016 12:35

I have already checked that out Longedge. The snap option is already ticked. The joints which have the black frames are butted up, even at very high 'magnification'

When the file is being rendered, it happily thrums along until it gets to the time of the black frames, then it crawls along , so my guess is that this is an effect related to rendering.

Longedge

Senior Contributor Joined: Apr 28, 2011 15:38 Messages: 1504 Offline

Sep 01, 2016 13:09

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This message was edited 2 times. Last update was at Nov 09. 2016 10:17

stevek

Senior Contributor Location: Houston, Texas USA Joined: Jan 25, 2011 12:18 Messages: 4663 Offline

Sep 01, 2016 13:20

If you switch from Tomeline view to Story Board, do you see the black or blank or extra frames? If so, you can easily remove them in that view. .
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Canonman5D3

Newbie Location: UK Joined: Jun 26, 2016 14:17 Messages: 17 Offline

Sep 01, 2016 13:29

Nothing is visible in either storyboard of timeline view. It is only the rendered file which has this peculiarity. My guess is that somethinghappens during rendering. Perhaps:

Insufficient processing power

something odd with timings 25fps v 24.9xx fps

Longedge

Senior Contributor Joined: Apr 28, 2011 15:38 Messages: 1504 Offline

Sep 01, 2016 13:54

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This message was edited 1 time. Last update was at Nov 09. 2016 10:15

Canonman5D3

Newbie Location: UK Joined: Jun 26, 2016 14:17 Messages: 17 Offline

Sep 01, 2016 14:26

I have just rendered the file to mp4 and the result was perfect!

I'm going to do some more variations to see what works and what doesn't. I wonder if it is down to the huge variation in file structure between the captured AVCHD file and a small highly compressed WMV file. Maybe pushes the hardware too much?

Longedge

Senior Contributor Joined: Apr 28, 2011 15:38 Messages: 1504 Offline

Sep 01, 2016 14:48

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This message was edited 1 time. Last update was at Nov 09. 2016 10:16

Håkan K

Member Location: Sweden Joined: Aug 07, 2016 10:03 Messages: 54 Offline

Nov 12, 2016 06:18

I expereinced the same problem with my 4k material. In the end I found out it happened if I first went into ColorDirector for some color grading, back to PD power tools > video speed > time shift > render. No issues were seen in the timeline before rendering. Now i do it the other way around and it seems to work out OK.