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Transcoding 50fps to 25 without it footage being in slow motion.

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Romina Rey
Transcoding 50fps to 25 without it footage being in slow motion.
on Oct 20, 2016 at 4:57:10 pm

Hi I need to transcode raw footage shot at 50fps for a project that will be entirely at 25 fps and the editor wants all the footage to run at regular 25fps and not slow motion.
What is the best and fastest way to do this?

Thank you in advance for your time and I hope to hear from someone soon.

Romina


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Dave LaRonde
Re: Transcoding 50fps to 25 without it footage being in slow motion.
on Oct 20, 2016 at 5:00:16 pm
Last Edited By Dave LaRonde on Oct 20, 2016 at 5:01:24 pm

25fps Progressive or Interlaced? The technique varies between the two.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Romina Rey
Re: Transcoding 50fps to 25 without it footage being in slow motion.
on Oct 20, 2016 at 6:40:28 pm

Thanks for your response. I believe it's interlaced because it was shit 1080/50.
I am told that is most likely interlaced but I am not sure.

Would you be able to tell m both methods while I get more information.

I don't know what would be the easier way or if there is a way to do it in mpeg streamclip or premiere or in another editing software


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Dave LaRonde
Re: Transcoding 50fps to 25 without it footage being in slow motion.
on Oct 20, 2016 at 7:28:46 pm
Last Edited By Dave LaRonde on Oct 20, 2016 at 7:29:40 pm

The chances are very good the footage is interlaced. The "50" at 1080 very commonly refers the the number of fields -- 2 fields make a frame. The editor should have been aware of that.

If the editor demands progressive footage, you can use Adobe Media Encoder to make it 25fps progressive. You can also use Adobe Media Encoder to transcode it to the media container & codec that's needed.

You simply have to learn what the editor wants.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Romina Rey
Re: Transcoding 50fps to 25 without it footage being in slow motion.
on Oct 20, 2016 at 7:56:14 pm

Okay so I've just received the footage. They shot with an Alexa Mini and when I import the footage into premiere the footage was shot at 2944 x 2160 at 25fps but it's playing back in slow motion and they need it in 1080 25fps Apple Pro ResLt not in slow motion. I'm baffled by how it can be in slow motion if the footage reads 25fps.

Is the only way to bring it into a sequence and ramp up the speed at 200 and export?


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Dave LaRonde
Re: Transcoding 50fps to 25 without it footage being in slow motion.
on Oct 20, 2016 at 8:12:46 pm

How did you create the PP Sequence you made? I would right-click on a clip, and make a sequence based on that clip.
If it STILL plays at half-speed, write back.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Romina Rey
Re: Transcoding 50fps to 25 without it footage being in slow motion.
on Oct 20, 2016 at 8:23:48 pm

Yes I dragged and dropped so that the same specs would be on the sequence and even when I play it in QuickTime it reads 25fps but plays in slow motion.


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Dave LaRonde
Re: Transcoding 50fps to 25 without it footage being in slow motion.
on Oct 21, 2016 at 2:34:51 am

Please highlight the clip in the timeline. Check the clip's attributes. If it is 25 fps, someone did something wrong when shooting. You should then CONFORM the clip to the proper frame rate, 50 fps. The clip then can go into a 25 fps timine & exported. If you wish, this timeline can be 1920x1080. Right-click on the clip andd scale to fit the timeline. You can then export the clip; highlight the timeline and use the cmd-m (ctl-m win) command. queue it. It will go to Adobe Media Encoder. In AME, you can build a preset to go to the variant of ProRes of your choice.

When they are queued, you can then batch convert them in AME.

THIS IS A LOT OF WORK! Perhaps someone knows an easier way to do this. If so, I hope they tell you.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Tero Ahlfors
Re: Transcoding 50fps to 25 without it footage being in slow motion.
on Oct 21, 2016 at 3:58:06 am

[Romina Rey] "I'm baffled by how it can be in slow motion if the footage reads 25fps. "

Because the camera recorded the high speed footage in a 25fps container. The Red cameras do a similar thing.


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Jeff Pulera
Re: Transcoding 50fps to 25 without it footage being in slow motion.
on Oct 21, 2016 at 2:44:16 pm

Hi Romina,

If the source is 50i, and you export as 25p, that should work without any other steps, will be deinterlaced during export. Try a sample first and make sure it looks good though. I've done this with 60i to 30p before.

Thanks

Jeff Pulera
Safe Harbor Computers


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