Norman Black
Forum Replies Created
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mpeg-2, incl xdcam ex, can have the same quality as AVC/H.264. It all depends on the bitrates used for each. Generally mpeg-2 will need a much higher bitrate than AVC for a similar quality. Bitrate determines the size of your files.
Do your own tests and let YOUR eyes be the judge on your material. AVC can have up to 2x lower bitrate than mpeg-2 formats. Note I said “up to”. It is an extremely variable thing.
At the high bitrate of Blu-ray templates you will probably have trouble seeing differences between an mpeg-2 Blu-ray and AVC Blu-ray. Again, it depends on the source material.
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[Aaron Star] “From Vegas, I would render your finals to XDCAM-EX, then use Handbrake. Handbrake will use the best image scaler for sizes below your project setting, and a VBR codec which will minimize your storage needs.”
??? If you target a bitrate X in Vegas AVC and the same bitrate in Handbrake AVC then the file sizes will be the same.
Handbrake may have better visual quality at a given bitrate, but that really depends on the bitrate being targeted. The lower the bitrate the better x264 is in comparison the the AVC encoders in Vegas.
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A faster computer will speed things up.
You did not mention what encoder (render as) you were using. If you are encoding to AVC in Vegas then there are two AVC encoder options. Sony AVC is faster than Mainconcept unless MC AVC supports your GPU and then it will likely be faster.
Most times, the speed is what it is, since the Vegas encoders are what they are.
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If you have 10 bytes, then you have 80 bits.
If your bytes per second value is 1000, then your bits per second value is 8000.In file encoders we specify bitrate in bits per second and not bytes per second.
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If you have Vegas 12 or later you can use the Layer Dimensionality effect and keyframe the foreground opacity control.
Otherwise you can use a track composite envelope and keyframe it around the the event in question.
If all you want to do is take the start of a clip and bring it up from 0 to some level over a given time then just use a fade at the front of the clip. To put a fade in just grab the upper left corner of an event and drag it in the time you want. You can change the fade curve to your choice but the default is best, which is smooth and not technically linear.
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The annoying thing to remember here is that the Vegas preview window only shows your video properly when your levels are full range. Your encode wants studio levels so only apply the levels adjustment when encoding.
The inverse is true if your source is video levels. You need a levels adjustment during editing for the preview window, and then take it off when rendering.
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What is your source material. This could easily be a levels problem. Levels problems are super common with Vegas users.
Many cameras output full range signal levels, but when you render most of the time you want video signal levels. If you send full range to the encoder, then on playback the player will assume video levels and then expand the levels giving the situation you show.
Any DSLR like Canon/Nikon/Panasonic are going to have full range levels. GoPro also.
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I think the Trimmer has use. For people with lots of longer media that you want to pick out multiple pieces from the media. For GoPro people we end up with lots of very long media and lots of short good bits within that media.
In the trimmer you can move along through the media looking for your pieces and the trimmer remembers its position as you send events to the timeline. Dragging a long piece of media to the timeline for each event you want one is in effect starting from scratch. Also one may not know at the start how many good bits there are in the media you are trimming from, so dragging the media multiple times is kinda a non starter there.
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[Boon Poh Ching] “What should I do to know is there any bugs in Vegas or GPU device?”
The only thing any of us can do about bugs in software is to work around them, and report them to technical support.
By working around this problem involved turning GPU support off. It sounds like not enabling GPU in the encoder has your render work. So do that. If that is not enough then also turning GPU support off in the Vegas video engine is something you can try.
Before doing any of this make sure you have the current video card driver installed. From direct personal experience, I have found AMD drivers have gotten better over time. Also, having the current driver is the first thing Sony technical support will ask you to do.
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[Boon Poh Ching] “es, you’re right. But I just wonder why?”
Bugs in Vegas and/or the GPU device driver.