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Encoding Artifacts / Pulsing Video
Greetings,
I’m hoping the group can help with an occasional problem we’re seeing when rendering DV AVIs out to certain formats in Vegas. From time-to-time, when creating WMVs or H.264 MainConcept mp4s, we’ll see the encoded file show artifacts in the form of steady pulse. It looks like a keyframing issue, but I’m really at a loss as to how to fix it, given that it happens across multiple output formats using various encoding settings.
I’ve put up an example file at: https://tinyurl.com/csfz9g
It’s a short 500kbps h.264 clip rendered using the mainconcept engine in Vegas 8.0c. I’m also seeing the same issue with Vegas 7.0 on another machine.
The source file is a DV AVI Captured through a Sony DSR-50’s 1394 pass-through.
Any thoughts would be immensely appreciated…
Thanks!
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2 Replies
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It looks like about a 1Hz cycle, so it could be the keyframes or it could be the GoP set to 30, but I don’t know that those options are revealed to the enduser in the consumer MainConcept H.264 implementation. I don’t think you have that control with the Sony AVC encoder either, but you should certainly try it.
I think there’s an in-loop deblocking filter too that might help.
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Thanks Eric.
Yeah, we’ve tried the deblocking filter, but had no luck. the options otherwise are relatively limited.
It happens when converting this file to WMV in Vegas, as well as converting it to MP4 using a xilisoft converter. however, adobe media encoder deals with it no problem. i’m trying to retain a vegas workflow, so i was hoping to get it fixed in vegas.
to me, it seems like an issue with the source file, but i just can’t imagine what would cause certain DV AVIs to exhibit this problem and not others.
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