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St Devious
13th June 2009, 04:25
I'm looking to upload some game videos to youtube recorded with FRAPS. Could you please offer some tips on the bitrate, avisynth filters or post processing before uploading the video to youtube.

I currently plan on doing 10Mbps, x264 unrestricted 2 pass HQ profile encodes. I record at 1280x1024 and plan on resizing with lancoz4 to 1920x1080.
Dark Eiri
13th June 2009, 05:00
No need to resize to 1920x1080. 1280x720 is more than enough, given youtube will resize it anyway, if it's bigger.
If you plan to keep the aspect ratio, you should resize to 1024x720. But since I don't know if youtube will consider it HD, I'd say add black bars till you get 1280x720 just to be safe.

x264 10 Mbps is overkill for most things. Bitrate choice really depends on the content you're encoding. I'd say 6 Mbps is more than enough, but you never know with games, since the motion is so sharp.
St Devious
13th June 2009, 05:05
No need to resize to 1920x1080. 1280x720 is more than enough, given youtube will resize it anyway, if it's bigger.


wouldn't the loss in quality be less while downsizing rather than encoding at the same size. Their HD's are 1280x720.
Snowknight26
13th June 2009, 07:13
No, it would be worse because you're resizing it to 1920x1080 to begin with.
mariush
13th June 2009, 14:55
You should record at 720p if possible (1280x720) and if there's no such resolution option, something very close to it, like 1024x768 if you can cut a few pixels from the top and bottom and add black bars on the sides, or 800x600 and then resize to 960x720 and add black bars on the side.

I don't think you need to use more than 4mbps but I guess it depends on the game. Personally, I use the DXVA-HD-Balanced profile because any more is not worth it, Youtube recompresses the video anyway to something like 1-2mbps bitrate so all the extra quality is pointless.

If you don't want the videos to be recompressed you should use something like Vimeo, I think they don't re-encode the video if it's within certain specs they list on their site.
Fr4nz
14th June 2009, 11:50
I'm looking to upload some game videos to youtube recorded with FRAPS. Could you please offer some tips on the bitrate, avisynth filters or post processing before uploading the video to youtube.

I currently plan on doing 10Mbps, x264 unrestricted 2 pass HQ profile encodes. I record at 1280x1024 and plan on resizing with lancoz4 to 1920x1080.


Any video that is over 720 pixels in height will be considered HD by youtube: just encode the original video as is, no resizing is needed.

About bitrate: Youtube always re-encode uploaded videos at ~2mbits/sec, so provide a source with good detail. For a 1280x1024 source with high motion scenes I think that 4-5mb/s is enough.
JohannesL
14th June 2009, 23:46
Use CRF.
St Devious
15th June 2009, 00:17
Use CRF.

is it better than 2-pass encoding ?
JohannesL
15th June 2009, 00:29
is it better than 2-pass encoding ?
It's faster, and saves you from guessing a bitrate. The quality:bitrate is about the same as 2-pass.
St Devious
15th June 2009, 00:38
It's faster, and saves you from guessing a bitrate. The quality:bitrate is about the same as 2-pass.

I see that the recommended value is 18-26. How do those values relate to layman terms.

Like Bitrate is this much Kb per second. If that is less than certain amount, then artifacts start to occur. So how does CRF values relate ?
Chengbin
15th June 2009, 01:04
I see that the recommended value is 18-26. How do those values relate to layman terms.

Like Bitrate is this much Kb per second. If that is less than certain amount, then artifacts start to occur. So how does CRF values relate ?

18-22 is good quality. 18 is considered transparent.
St Devious
15th June 2009, 01:08
18-22 is good quality. 18 is considered transparent.

transparent as in video encoding terms meaning almost the same as the original ?
plonk420
15th June 2009, 01:19
perceptually the same.
Fr4nz
15th June 2009, 13:21
18-22 is good quality. 18 is considered transparent.

I find also 23-26 values good...
Chengbin
15th June 2009, 13:30
I find also 23-26 values good...

26 is quite bad even on a portable device.

Also, depending on the source, the perception of CRF's quality change. It takes CRF 18-20 for animated movies to look good on my Archos 5, when CRF 24 is fine with movies.
Fr4nz
15th June 2009, 13:43
26 is quite bad even on a portable device.

Also, depending on the source, the perception of CRF's quality change. It takes CRF 18-20 for animated movies to look good on my Archos 5, when CRF 24 is fine with movies.

Please, watch here:
http://tinyurl.com/n69el9

For this video I used CRF 25. Also, keeping in mind that this video was also reencoded by Youtube, I find its quality good...
Chengbin
16th June 2009, 01:30
Just curious, is YouTube's HD in high profile?
Dark Shikari
16th June 2009, 01:41
Just curious, is YouTube's HD in high profile?Yes .
JohannesL
16th June 2009, 20:56
The CRF value needed for transparency depends on the source.