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Flip4Mac – first few seconds, lots of artifacting
I haven’t used it more than a few times so far, but in all cases except for one, the resulting WMV file starts out very rough before smoothing out. Like it’s looking for preceding image data that’s not there until you get a few seconds into the video. (I’m no compression expert, mind you.) I have no idea why this didn’t happen on one of my encodes.
Anyone else having this issue?
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12 Replies
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What do these first few frames consist of?
What settings are you using?
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It’s just a talking head the whole way through, no camera movements or zooms.
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Ok, so no fade up from black?
Are there a couple of black frames at the beginning or a title or something that’s trowing it off course?
What data rate are you using?
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Nope, no extra frames or fade in or anything. Every frame is the same, except for the talking and gesticulating person.
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Why don’t you want to tell me the datarate?
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Sorry, didn’t see that question. It’s 15.60 mbit/s. (This is a high quality version that will be compressed and optimized by another team.) Thanks again for your help.
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Wow that’s very high. It maybe that your player can’t play this back and is artifacting. What are you viewing it in?
Is it a full HD clip 1920×1080?
Why are you using WMV?
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The source clip is NTSC DV footage that is destined to be a small WMV file posted on the company intranet. Since IT wanted to do their own compression, they requested a high quality WMV file as their source. I gave them this very high bitrate version just as their master, not intended to view really.
I believe I had the problem when I created a smaller version as well.
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It should only need a maximum of 5mb/s and even then that’s too high for just talking heads.
What have you got for your keyframe setting?
Are you deinterlacing?
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Yes my bitrate was probably overkill, but it was only a temporary go-between file anyway. Again, I’m sure I did a lower bitrate version that still had the problem.
To be honest I don’t remember what the keyframe setting was. Is there a way to detect that info in a movie file?
No deinterlacing, source is 24P, encoding preserved the 24 fps.
Thanks again.
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