![]() The Flash plugin for IE and Apple's Quicktime player do not. KMPlayer will uses video overlay by default. So if my system is clearly capable of playing the video without problems, why do you think I'm seeing the issue on YouTube? The issue is video overlay. Using the KMplayer the issue went away in whatever the default mode is. Now, if I record the output of that same DVD or a VCR via passthrough going through my Dig8 camcorder, I get the tearing artifacts as mentioned above. Something I've noticed, that for example if I play a DVD, it looks fine. I believe it has something to do with what happens to the data. My hardware doesn't seem to be the first culprit, since I see other video on YouTube that looks fine. An older card but seems to work fine for playing DVD's, video games look good on it, etc. When you refer to the graphic drivers, do you mean drivers for the video card? I've got an NVidia GeForce FX 5200. I just adjusted the refresh rate on my display to see if that made a difference, but I'm still seeing the tearing. Some graphic drivers may have broken video sync so you may not be able to get around the problem. Make sure they players are set up to use video overlay, vertical sync., and double or tripple buffering. flv conversion.īut you can download the FLV or MP4 files (via or whatever) and use VLC or KMplayer. It's the section that most clearly shows the issue I'm having with the. I really don't think bit rate is an issue, the original flv file before appending the black portion is 1382kbps - set at 1200 video and 160 mp3 audio the highest rate for audio & vid this particular app will do, which of course is watered down by adding the long, low bit black segment, which brings it down to 298.ĭo you see the artifact I'm referring to? The horizontal streaking?Īs a demonstration that it's pretty close to the original, here's a segment of the original. Keep in mind that the source is VHS tape which was then run through a Sony Digital8 camcorder via passthrough to DV AVI. It's actually fairly close to the original. There is not enough data to properly encode the video, which is why it looks blocky, smudgy, and overall youtube-ish. All the artifacts that are throughout the video are caused simply by lack of bitrate. It looks like most other low bitrate FLV encoded video - and therein lies your problem. Sorry, but there is no way you can convince me that is quality video. If that is good compared to the original source, the source must have been horrible. This type of problem is exacerbated by fast camera movement, video noise (like off-air analog recordings), smoke, heavy rain, etc. Areas of subtle shading will lag behind areas of bigger changes. The result of this is parts of the frame moving at different rates. Or a new keyframe will come along and the entire frame will be updated. Eventually, those slightly changing portions of the picture may change enough to warrant an update. So when decompressed the new frame may still contains a parts of the old frame. When the frame-to-frame changes start getting too big for the allowed bitrate the encoder starts considering parts of the picture that have changed only a little as not having changed. ![]() The decoder is simply told to leave those parts of the frame the same and just updated the parts of the picture that have changed. One of the most important methods used to reduce video file size is not to encode parts of the picture that don't change from frame to frame. It will vary from computer to computer depending on the CPU speed, the AGP/PCIe bus speed, and the refresh rate.Īnother possibility comes from the way high compression codecs work. This is a playback issue not an encoding problem. ![]() The tear will always be horizontal and the vertical position may vary from frame to frame. This can lead to tearing where part of the visible frame is from one source frame and part from another frame: This means it is writing RGB data directly to the desktop and is unaware of when the video is being displayed and when the graphics card is in the vertical blanking period. The FLV player plugin doesn't use video overlay. I'm not sure exactly what you are describing but here are two possible problems: It's most obvious when the camera either pans or orbits around the singer. There are these artifacts where you see these streaks, sort like sections of the image don't quite keep up with each other.
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