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21st April 2012, 15:40 | #1 | Link |
Testeur de codecs
Join Date: May 2003
Location: France
Posts: 2,484
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Elecard Buffer Analyser and x264
I actually make a guide for undestanding VBV to compressionist with x264 (and other codec too).
When I make encoding with x264 Elecard Analyser say that Initial CPB delay is only 0.001 sec. With this bad value Analyser find heavy underflow problem. With x264 vbv-init=0.9 and buffer=30000 maxrate=40000, delay should be very higher. I think that Analyser can't read correctly initial buffer for x264. Anyway Analyser work good for other H264 encoder like Ateme, Elecard and Mainconcept. Bug for x264? bug for Elecard Buffer Analyser? How corrige my x264 stream for indicate correct initial delay in HRD information?
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Le Sagittaire ... ;-) 1- Ateme AVC or x264 2- VP7 or RV10 only for anime 3- XviD, DivX or WMV9 |
22nd April 2012, 07:26 | #3 | Link |
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Join Date: Jun 2006
Posts: 30
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He must have, as other wise Elecard won't display any stats unless the stream has HRD.
I think the problem likely has something to do with using such a small CPB delay (0.75 seconds). In my experience I tend to get these sorts of errors if I use less than a 1 second CPB delay in x264, if I use a 1, 2 or 4 second CPB delay, Elecard never gives any errors. |
22nd April 2012, 11:34 | #4 | Link | |
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Join Date: Dec 2002
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Quote:
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23rd April 2012, 02:03 | #5 | Link | |
Registered User
Join Date: Jun 2006
Posts: 30
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Quote:
Since he's using a CPB delay of 0.75 (buffer/maxrate), and vbv-init of 0.9, his initial CPB removal delay *should* be 0.675 seconds. |
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