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Topic: Best codec for Youtube video (Read 13032 times) previous topic - next topic
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Best codec for Youtube video

Hello, would someone advise the best format/video encoder for uploading videos to youtube? I now use DivX 320x240 (30fps or less) (usually 200-300kbps) and mp3 32kbps, and I often notice that my uploaded videos are lower quality and load much slower than some other ones. What is the trick?
 

Best codec for Youtube video

Reply #1 –
they will get transcoded to flv, so upload the best you can.
PANIC: CPU 1: Cache Error (unrecoverable - dcache data) Eframe = 0x90000000208cf3b8
NOTICE - cpu 0 didn't dump TLB, may be hung

Best codec for Youtube video

Reply #2 –
Quote from: smok3 on
they will get transcoded to flv, so upload the best you can.

OK, but why some load faster than others then? I tried uploading the same vid with different bitrates/formats, and this had effect on the loading time (higher bitrate>slower loading)

Best codec for Youtube video

Reply #3 –
Quote from: jmartis on
Quote from: smok3 on

they will get transcoded to flv, so upload the best you can.

OK, but why some load faster than others then? I tried uploading the same vid with different bitrates/formats, and this had effect on the loading time (higher bitrate>slower loading)

that would either mean iam wrong or you are
PANIC: CPU 1: Cache Error (unrecoverable - dcache data) Eframe = 0x90000000208cf3b8
NOTICE - cpu 0 didn't dump TLB, may be hung

Best codec for Youtube video

Reply #4 –
My Youtube vids are DV sourced; I encode them to Xvid 640x480, ~1500kbps and LAME MP3  @ 128kbps CBR, usually, and IMO my videos look pretty good (just ask if you want to look).

I heard that 320x240 looks better because that's what it resizes to--I tried that with my latest video and the results were very disappointing. I'm going to stick to 640x480.

Are FLV files VBR encoded? That might explain a download difference...if FLV is assigning less bits, it will be a smaller file, thus a faster download. Just a thought.

Best codec for Youtube video

Reply #5 –
yes they could be VBR encoded, but the difference should be small, unless they do some sort of quality based encoding (unlikely), well i guess someone will have to rip some and do some comparison, like this one maybe:
http://somestuff.org/downloads/apple_trail...pple_ales.xhtml (which i did for apple trailers)

(mediainfo_gui + notepad ++ + open office calc)
PANIC: CPU 1: Cache Error (unrecoverable - dcache data) Eframe = 0x90000000208cf3b8
NOTICE - cpu 0 didn't dump TLB, may be hung

Best codec for Youtube video

Reply #6 –
Just a thought, but perhaps frame rate varies? Halving to 15 fps (or 12.5 fps for PAL or SECAM sources, or 12 fps for movie reels) might provide acceptable results with faster downloads. Also, mono sound might improve things, though I have a feeling Flash video might choke on mono, like it chokes on anything other than 44.1 kHz sampling rate.
Dynamic – the artist formerly known as DickD

Best codec for Youtube video

Reply #7 –
you think?  i belive they figured out about 100 years ago that one would need at least 24 fps for smooth motion, i dont see how 'internet' should change that? (basically: if you can not provide proper framerate, just don't do it...)
PANIC: CPU 1: Cache Error (unrecoverable - dcache data) Eframe = 0x90000000208cf3b8
NOTICE - cpu 0 didn't dump TLB, may be hung

Best codec for Youtube video

Reply #9 –
All I mean is there are certain types of content where low frame rate is acceptable. It might be how some people have forced lower bitrates out of a transcoder they don't have control over.

If it is VBR, it's conceivable that gentle blurring to reduce the highest spatial frequencies or temporal smoothing in VirtualDub could improve the quality/bitrate tradeoff. But when you don't have access to the FLV encoder on YouTube you simply have to try things to see what might work
Dynamic – the artist formerly known as DickD

Best codec for Youtube video

Reply #10 –
Dynamic, maybe, do you have a link?

(from 3 random clips i ripped two are 29.x fps and one is 24 fps, they all look like cr@p thought...)

anyway, with some proper bitrates and codec like VP6 you can get almost decent results using FLV, example:
http://blog.somestuff.org/index.php?entry=entry070821-044200
so, blame youtube for eveything
PANIC: CPU 1: Cache Error (unrecoverable - dcache data) Eframe = 0x90000000208cf3b8
NOTICE - cpu 0 didn't dump TLB, may be hung

Best codec for Youtube video

Reply #11 –
Quote from: smok3 on
they will get transcoded to flv, so upload the best you can.

Words I live by.
"And his eyes have all the seeming of a demon's that is dreaming." --Edgar Allan Poe, The Raven

Best codec for Youtube video

Reply #12 –
turns out there is a hack to be used to get online 1:1:
http://forum.doom9.org/showthread.php?t=129982


(but don't expect this to work for any longer amount of time...)
PANIC: CPU 1: Cache Error (unrecoverable - dcache data) Eframe = 0x90000000208cf3b8
NOTICE - cpu 0 didn't dump TLB, may be hung

Best codec for Youtube video

Reply #13 –
You should upload in the best possible format they accept for uploads, at the highest bitrate you can manage given their limitation on upload size.

They'll transcode it to flash video at around 300kb/s at 320x240, no matter what format you use.  Which means you really need your input video to be _significantly_ better quality than that when you upload to them.

Try sending them H.264 or MPEG-4 ASP video at 320x240 at at least 600kb/s video bitrate, with AAC audio at least 128kb/s bitrate (stereo, or 64kb/s mono).

A bit of noise reduction may help too, in theory, because there is no way of altering the way YouTube's transcoder encodes things and they have pretty fixed rate control.

Also keep in mind that in the future, YouTube may support higher quality video, and they may re-encode their existing videos to a better quality format (presumably from the source you uploaded?).  They have already announced that they are re-encoding their videos in H.264, initially just for AppleTV users.