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Stair-stepping artifacts when exporting H.264 426×240 video for web
I’m trying to export a 16:9 video clip for web using H.264 compression at 426×240 resolution from compressor using square pixel aspect ratio. No matter what bit rate I set it at — 600kbps-6,000kbps I still get these really jagged edges. Even though my source is DV, the original file does not have anything close to this; also I have never had this issue before. One other thing to note is that if I export at full resolution H.264 — 640×360, I don’t get any stair-stepping.
Here is a frame grab of the video with the problem:
https://salsunproductions.com/misc/crapy_artifacts-h264-frame.jpgYou can download a video clip of it here (data rate is around 600-700kbps):
https://salsunproductions.com/misc/crapy_artifacts-h264.movI’m also noticing some sort of horizontal lines in the artifacts?? This is progressive scan footage shot on a DVX100B 24pA (and captured properly w/2:3:3:2 pull down removal, the original file doesn’t have this)
Any assistance would be greatly appreciated. This is getting really annoying having to export huge files…PS: I’m using Compressor v3.0.2
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1 Reply
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Okay, I can think of two things. For one, change your frame size to 427×240, square pixels. That might help smooth it out as it will be the proper aspect.
Also, triple chck you compressor settings for your source clip. Sometimes I find that compressor guesses the wrong field order on clips. So when you drag your clip to compressor, single click on the movie (not the setting) to open that movies insecptor properties. Make sure that the movies field dominance is set to progressive. Then apply a setting and open the inspector and make sure that you have the output fields set to ‘same as source’.
Does that make sense?
Jeremy
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