FFMPEG: Bitrate peaks
I really like the encodings done with ffvfw, and I couldn't control the max bitratepeaks either. So I looked at one movie in Bitrateviewer, and found that the average bitrate was¨839 kbit/s and with peak at 5540 kbit/s.
I was doing a SVCD at 480x576 and VBV 112 (56 in BV). Muxed and burned as SVCD. When I was watching the movie in my standalone, I didn't see any difference at those scenes with the high bitrate peaks ???? I have now done 5 movies, they all have bitrate peaks between 3500 and 5540 kbit/s, and they all played perfectly... Maybe I'm just lucky to have a standalone, that will play these movies, but I'm a very happy with my results and testings :D Have anybody else actually tried to burn these high bitratepeaks movies and tested them in your standalone? Well, just wanted to share my findings :D Anerboda |
Well it's good for you your player will play it, and I'm also pretty sure my player will play SVCDs with peaks of ~5000kb/sec, but when it comes to DVD encoding and the peaks go up to ~15.000kb/sec, I guarantee you that NO standalone on the world will play it, because it's just way out of standard... :roll:
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Bitrateview calculates the bitrate BEFORE the use of the vbv buffer. If you want to create an standard svcd, it's only important, that the bitrate AFTER the use of the vbv buffer ist below 2756 kbit/s (oder something like that).
thats the case when i encode stuff with mencoder, even if there are the same bitrate peaks, too. Additionally, you can reduce the rate control tolerance, this will cut these peaks. not even scenarist complaints about peaks @ 10 mbit/s (+2 mbit/s audio), if rct is not too high, and this tool generally complaints about everything. |
Hi anerboda,
I still didn't get peaks above vrc_maxrate in mencoder, did you get them?. What was your mencoder command-line, and what the bitrate peaks you got?. Did you take a look at that scene overbitrated?, how did it look?. AFAIK there's no single function in mencoder to adjust rate control tolerance. How do you adjust it?. Do you make use of vrc_eq, vi/b_qoffset,...?. I'm really curious about this bitrate peaks :? |
:lol: I think he's talking about ffvfw encoding :lol:
This is getting a bit out of hands :lol: So many encoders in these threads that we don't really know what we're talking about :wink: Could you tell us which one you're experiencing over-bitrates? @all, When you start a thread be a sports and tell us which encoder and OS you refer to :wink: Cheers |
Well, Rui, I don't really know:
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Hi amenophis, from man_page:
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Then, what is vratetol supposed to be doing?, how does it work?. Where did you take that 1000 value?. When you change it, what happens to the m2v file, and the image?. Amenophis, I see that you use some settings (vqblur=0.3, lumi_mask, dark_mask) that I suppose that you got from your tests, or from guides, forums,... Could you help us with these settings, and how you decide which employ in every situation/film (increase filesize, increase compression, improve quality,...)? |
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My testings and results were done using the ffvfw codec, and my OS is XP pro. This is not a new thing, it was discovered long ago in some other threads, I was just curious if these movies with high bitrate peaks would play in my standalone, and they do. Anerboda |
Lucky you, Anerboda :wink: .
As for some of us can't say the same... Anyway maybe one of these days Milan solves it, for us. Thanks for sharing it with us. Cheers |
I've got one question. Is the bitrate peek acceptance for standalones related to VBV value :?: I mean, DVDs cann accept 9MB/s with VBV224 (good value ?) , so what will hapen when we'll set VBV value to 224 for SVCD streams. Maybe this will solve peek problems.
It will be great if some with problem of high bitrate on standalone test this way. I have no problem with them. |
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Just for info,
my player also doesn't accept high bitrates. It seems to me that with bitrates above 9500 for DVD, and above 2900 for SVCD, it beggins to "skip" frames or "slow motion" like. In SVCD I managed to raise a bit (I think to 3000) adjusting VBV. But this small change for DVD means nothing |
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Problem was with ~5000kbps as Anerboda pointed, so I was just wonder if that type of file (with bitrate peek let say around 5000kbps, with VBV set to 224, and muxed as SVCD) will be playable on standalones that do have problem with VCD bitrate peeks above permited ~3000kbps. As the DVD with the same bitpeek value will be playable. And yes, my standalone (the one I'm testing) plays even 7000 bitpeeks with VBV set to 40. |
Well, Hydeus, as I just posted, 5000 kbps won't play in my standalone in VCD neither SVCD (I already tested playing with VBV) :cry:
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To what value, and how you adjusted this :?: (of course VBV)
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Hya,
As far as I have understood from www.dvdrhelp.com any SAP could go up to the 4500kbps in an X(S)VCD. But that means that some will do no more than 3000kbps. Some won't go above SVCD specs., period. As for DVD all should go fine up to DVD specs. which is 9800kbps for video only, but very few should do more than that. Maybe the new SAP era of DivX capable players will do > 9800kbps but what about the others... DivX capable SAPs are still above 300€/$. At least here in Portugal. I can buy a SAP for less than 70€/$ here if I don't care about MPEG-4, and I don't :twisted: :!: So let's see if in a not so far future Milan can give us a hand. BTW have you noticed that now the FF forum is not exclusivly dedicated to U*NIX and Co. :?: :mrgreen: Cheers |
I think that bitrate viewer is bunk...
I have a secondpass file encoded with ffvfw...When I checked it with bitrate rate viewer, the maxium peak was 8879. After running pulldown, the bitrate peak jumps to 10612. How can that be? |
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I know that Bitrate Viewer does give incorrect average bitrates on MPEG-1 files. The true average bitrate is found with VirtualDub. Maybe it's time for me to write "Bitrate Peeper" :mrgreen: -kwag |
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