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29th April 2009, 18:38 | #23 | Link |
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That is interesting that it accepts at least one lossless codec. Anyone tried FFV1 or any others? What about MJPEG?
Regarding the vertical resolution halving issue with 480 line HQ videos, this definatley occurs with HD 720p videos too This must have been what was happening to imk's videos. To get good results with my PAL videos for both HD and HQ I upscaled to 1536x1152 - obviously being VHS sources they look quite blurry in "HD" but in the standard YouTube window they're not too shabby and there's no serious blocking or anything. I have noticed apparent dropped frames with some of my HD videos played in HQ mode - it looks like frames are being dropped when playing within the website or using MPC+ffdshow, but when playing in VLC they look fine. Reported framerate is still 25fps. Any ideas? |
29th April 2009, 20:03 | #24 | Link |
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Not related to quality entirely, but I found that if I upload a really high-quality MP4, YouTube will actually re-encode it with video and audio out of sync. The video will play choppy, too.
http://www.youtube.com/watch?v=hmuRCUJmDik&fmt=22 If I upload a MKV instead of a MP4, it seems to handle it fine. |
29th April 2009, 20:40 | #25 | Link |
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Yes, MKV seems to be the most reliable containter - I've uploaded >20Mbit/s x264 video with no problems.
I've also noticed if you upload HD video with no audio, it will not play it back properly within the website - the loading circle keeps flickering in the centre throughout playback. If you download the video it will play fine though. I didn't try using AudioSwap to see if it is just the lack of an audio stream that causes this. |
1st May 2009, 21:22 | #26 | Link |
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I use 720p x264 encoded H.264 with --crf 20 and pretty basic settings for all of my videos, and it turns out pretty good: http://www.youtube.com/watch?v=5dYl8...el_page&fmt=22
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1st May 2009, 23:32 | #27 | Link |
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That video seems to suffer from the same issue I noticed when uploading 720p, i.e. it is vertically blurred. It's very noticeable if you download the video (using one of the many Firefox plugins for example) and watch it at full size. What resolution was it rendered at? I assume it's from an emulator. You should try uploading at something like 1280x960 and compare the difference.
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16th May 2009, 14:22 | #28 | Link |
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In the beginning, only 1280x720 uploads would get HD on YouTube. SM64 is 1.429 letterboxed to 4:3, so for a while, I cropped out the borders, scaled to 1028x720 and pillarboxed to 1280x720. I recently found out any video with a height above 720 will get HD now, so I tried to crop out the borders and scale to 1280x896 and upload, and YouTube downscaled it to 1028x720. The quality is a bit better than my 1280x720 uploads.
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archlinux Last edited by JohannesL; 16th May 2009 at 18:02. |
26th May 2009, 13:21 | #32 | Link | |
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Quote:
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...yeah...but...why on earth would I compare apples with apples? |
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18th June 2009, 14:57 | #34 | Link |
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Using this Avisynth script on a 640x448 RGB video game source:
Code:
function nnedi22x(clip a) {return a.nnedi2(1,true).turnright().nnedi2(1,true).turnleft().spline36resize(a.width*2,a.height*2,-0.5,-0.5)} avisource("Direct64.avi") lumvid = ConvertToYV12().NNEDI22x() chromvid = PointResize(Width()*2,Height()*2).ConvertToYV12() MergeChroma(lumvid,chromvid) LimitedSharpenFaster() And then encoding with x264 at CRF 21 and uploading, I got this quality: http://www.youtube.com/watch?v=Uazn8oNRYVg&fmt=22
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archlinux Last edited by JohannesL; 20th June 2009 at 12:45. |
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x264 for youtube, youtube, youtube higher quality, youtube hq videos |
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