Hi there!
I'm having this problem that I can't get over.
Basically, I'm uploading some game footage, specifically GTA IV game footage. So I use FRAPS and capture 1280x720 16:10 which I convert to 1152x720 to have the correct 16:10 aspect ratio. I do this because even with scaling on, the image is stretched on my 16:10 monitor but it's still a heck of a lot better than without scaling, where GTA IV freaks out and completely screws my picture for some reason (makes it tiny and ultra ultra ultra widescreen...).
I encode with x264 using VDub, 2 passes at 3600 kbps, with some other settings changed since the picture is very dynamic (moving vehicles) and I need it to look good.
On my PC, the quality loss after encoding compared to what FRAPS puts out is very little. 3600 kbps is good for nice quality and reasonable file size.
However, when I upload it to YouTube, the HD quality severely lacks compared to other people's footage, of the same game of course.
I've downloaded the 720p MP4 and put it in MediaInfo and I noticed that, while I have roughly the same average bitrate as other people's videos, the maximum bitrate is definitely lower and that YT converts my videos with ReFrames=1 and not 3 as with other people's.
This is one of my test videos, please watch in HD. When the car starts moving, the quality drops severely : http://www.youtube.com/watch?v=Sty1TMVHkYg
For comparison, watch this videos, as an example :
http://www.youtube.com/watch?v=05EAsGnlvLs&hd=1
http://www.youtube.com/watch?v=wBS-W0HuLug
http://www.youtube.com/watch?v=8V6wab6EkCM&hd=1
http://www.youtube.com/watch?v=pF_RKneiVdQ&hd=1
The quality doesn't plummet when the car is moving, like it does on my video.
I've also tried encoding to WMV at 6000kbps and the results are the same. Same results with a 6000kbps x264...
So, does anyone have any idea what's going on?
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Last edited by MindBlank; 21st May 2010 at 10:38.
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conspiracy theory: maybe google is slowly dropping their quality settings of h.264 to "encourage" adoption of vp8....
On a serious note, try 1280x720 with black borders if you want to keep 16:10. The other videos seem to be full frame 1280x720, maybe there is a switch when you upload different dimensions? -
Hmm...I've thought of that too, and I've uploaded a 1280x720 video without resizing and the quality is still poor...
On a side note, I've only managed to use 1 video resized through VirtualDub, the rest gave me a "Failed to convert" error by YouTube after uploading. I had to keep the videos as 1280x720 and use a tool developed by a cool guy to change the SAR/DAR without re-econding - the tool is H264ARM, otherwise YouTube would fail to convert... -
Well there are differences in the examples you gave. The others tend to have less motion , or longer sequences where there are low motion sequences. The bitrate could then be distributed better (more allocated to the motion scenes) , in contrast, your piece is almost all driving
But that doesn't explain the different encoding settings (ref=1 vs. ref=3).
The dates are different (yours is more recent) , so maybe they did change their encoding policy ? -
No, I'm comparing only the driving sections. The example videos have driving in them but not at the beginning, like mine.
That could also be a possibility. I just can't explain the Ref=1 i get...
EDIT : Just checked with some videos uploaded a few days ago/today. They look better then mine...Last edited by MindBlank; 21st May 2010 at 11:21.
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That was the point. If you have a still section, it uses less bitrate. That extra bitrate saved can be used to improve the driving section, or any other complex section. This is a "trick" a lot of youtube users use. They start with an low complexity intro sequence. Others include just black screen for the last 9 minutes... you get the idea
I just can't explain the Ref=1 i get... -
Oh... I get it now. So that might be the answer.
Except the ref=1, that might actually explain it. However, I did see regular videos of people driving that looked better, probably due to the non-pathetic ref=3 they have.
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