Rendering for hd

[Nico Stojanovski]

See if this one is to prefer: https://www.youtube.com/watch?v=cAUCMYgQVSM

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[Ramiro Teran]

Thanks !! I’m trying it

[Dave Haynie]

For online streaming HD, yeah, 1280×720 is the most common format these days. If you shoot on a more advanced camera these days, and you’re shooting for the web, shoot in 30p or 24p ahead of time. If not, render to 30p or 24p anyway (30p gives you a bit better results on high motion stuff, but it’s going to be a bit larger for the same quality).

Now of course, when you’re shooting HDV compatible you’re at 25Mb/s, and with that new-fangled SxS camera you can shoot as high as 35Mb/s. For online, you typically crunch much smaller… probably to one of the MPEG-4 CODECs, at or around 3-4Mb/s. At 2 minute video at 3Mb/s comes out as 45MB (a bit more, depending on whether you consider audio in that 3Mb/s number).

For YouTube specifically, they prefer MPEG-2, MPEG-4/ASP, or MPEG-4/AVC format uploads, with audio in MPEG Layer 3 or MPEG AAC format. The MPEG-4 formats have better coding efficiency, with AVC (also known as H.264) the best overall. AVC is generally considered the successor to MPEG-2 anyway these days: it’s the generally preferred format on Blu-Ray, it’s being used in consumer camcoders, and it’s commonly used in satellite TV, and pocket video (DVB-H, iPods, etc). As a result, you have this CODEC included with Vegas 8. There are versions from Sony and from Main Concept.. you can set up profiles for Web video based on this sort of thing: 24/30p (technically, 23.9 or 29.97fps.. normal NTSCfilm or NTSC frame rates), set the bitrate to 3-4Mb/s, etc. These are some of the most time consuming CODECs out there — AVC is pretty complex… I get about 3:1 vs. realtime on my Quad core machine.

These days, YouTube transcodes into a few different formats online. H.264 is actually one of the video formats supported under the banner of Adobe Flash video; the other is a proprietary Flash Video format (.flv files). The YouTube server will certainly transcode your upload into these formats, at lower bitrates, and you really have no control over this. But knowning that, you can ensure your video is of reasonably high quality prior to upload, so the transcoding won’t bruise it too much. These days, you can upload higher quality video to YouTube — they accept up to 1GB per upload, but they’ll still cut it down. The message there is, for this kind of service, you don’t have to crunch it so much on your own.

Some services will deliver Flash Video as uploaded if it meets their specs… I think YouTube used to do this, I’m not sure they still do (they have always been a bit mysterious about what they’ll do with your video, which of course gives them the freedom to change that plan). There are stand-alone Flash Video encoders out there, which can render from an MPEG-2 HD original. I don’t know of a Flash plug-in that lets you render directly from the Vegas timeline.

-Dave

[Ramiro Teran]

Dave thank you so much !! Great info.
I rendered using main concept AVC/ACC and changed the parameters
from 1920.1080 to 1280.720
Variable bit rate: max 4.000.000 ave: 2.000.000
The result is actually very good !
I did try going lower to the point of no use and it was pretty good even at 1.000.000
The 5’30” minute video is now 82.8 Mb
But I will try what I read from you.
Thanks a lot ,great help !
Ramiro,