Fast Decode option

Discuss encoding for devices and presets.
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veresk
Posts: 20
Joined: Thu Aug 23, 2018 8:12 pm

Fast Decode option

Post by veresk » Tue Sep 18, 2018 9:34 pm

What are the downsides of enabling Fast Decode option?

If it does only good, then it should be always checked.
If it has some downsides, then what are they exactly?

When I give the encoded file to my customer, how would I know on what device my file will be played back and to what online video streaming hosting it will be uploaded. My product must be as much universal as possible! So if I should turn ON the Fast Decode option -just to make sure-, then we all need to know:
What are the downsides of enabling Fast Decode option?
(especially, does it influence the quality of uploaded result to youtube/vimeo)

Thank you!
Last edited by veresk on Tue Sep 18, 2018 9:41 pm, edited 2 times in total.

mduell
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Re: Fast Decode option

Post by mduell » Tue Sep 18, 2018 9:37 pm

Lowers compression efficiency (quality for size).

Woodstock
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Re: Fast Decode option

Post by Woodstock » Tue Sep 18, 2018 9:52 pm

Considering that Youtube and Vimeo both recompress your video/audio in multiple ways between when you upload it and it is made available for download, "fast decode" means nothing on the submission side.

veresk
Posts: 20
Joined: Thu Aug 23, 2018 8:12 pm

Re: Fast Decode option

Post by veresk » Tue Sep 18, 2018 10:03 pm

Woodstock wrote:
Tue Sep 18, 2018 9:52 pm
Considering that Youtube and Vimeo both recompress your video/audio in multiple ways between when you upload it and it is made available for download, "fast decode" means nothing on the submission side.
Well, my thoughts are exactly the same, but I wanted to really make sure :) you never know...

mduell
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Re: Fast Decode option

Post by mduell » Tue Sep 18, 2018 10:03 pm

For uploading to youtube/vimeo, you should use the youtube/vimeo presets.

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BradleyS
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Re: Fast Decode option

Post by BradleyS » Wed Sep 19, 2018 8:53 pm

Important to note that using the associated presets typically results in the video not being recompressed by YouTube at the original resolution.

veresk
Posts: 20
Joined: Thu Aug 23, 2018 8:12 pm

Re: Fast Decode option

Post by veresk » Tue Oct 30, 2018 12:03 pm

mduell wrote:
Tue Sep 18, 2018 9:37 pm
Lowers compression efficiency (quality for size).
So I've tested - the result is quite the opposite to what you've stated about quality/size.
With Fast Decode option turned OFF I've got a bigger file. I've double checked - yep! unchecking increases the size.
So?

rollin_eng
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Re: Fast Decode option

Post by rollin_eng » Tue Oct 30, 2018 12:10 pm

Could you please post your HB logs, instructions can be found here:

https://handbrake.fr/docs/en/latest/hel ... y-log.html

veresk
Posts: 20
Joined: Thu Aug 23, 2018 8:12 pm

Re: Fast Decode option

Post by veresk » Tue Oct 30, 2018 12:39 pm

Apologies, my mistake!!
I watched as the file size grows while encoding and at some point that file size became bigger... so I wrote a post here =)
But looks like it was only during the encoding! After encoding was completed the file size has become smaller then the "Fast Decode ON" version.

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