Mpeg2 Video Stuttering...

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Mpeg2 Video Stuttering...

Postby OhmGautama » Tue May 08, 2007 12:00 pm

After exporting my video from TMPGenc as an MPEG-2 , it looks great until around 3:50 and the video and sound begins to stutter and skip. The video is still there, and if I skip over the part at 3:50 , the rest of the video/sound works fine. Ive also exported a MP4 version and it works fine , even at the 3:50 mark. The lossless version ive exported also works fine at that point as well, so I don't think the source is a problem.

Any idea what may be causing this? If I left out any information you may need let me know. Thanks yet again! :D
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Postby bobstur » Tue May 08, 2007 4:11 pm

well if the lossless(lagarith) codec works
why dont u render your video in lossless and then open vir dub mod and try to convert it in to MPEG 2.
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Postby Scintilla » Tue May 08, 2007 5:45 pm

@bobstur: VirtualDubMod can encode MPEG-2 files?

Anyway, what were your encoding settings? I remember having this kind of problem once before, and I want to say that reducing the maximum bitrate would fix it, but I'm not sure.
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Postby OhmGautama » Tue May 08, 2007 6:57 pm

My settings are :

Stream Type : MPEG-2

Size : 720x480

Frame rate : 29.97 fps

Rate control mode : Automatic VBR (CQ_VBR)
Quality - Highest
Maximum Bitrate - 15000 kbits/sec

Profile & Level : Main Profile and Main Level

Video format : NTSC

Encode mode : Non-interlace

YUV Format : 4:2:0

DC component precision : 8 bits
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Postby OhmGautama » Tue May 08, 2007 7:04 pm

I was thinking maybe it was the maximum bitrate as well, but I havent tried to lower it yet. It stops at a point in my video, where it (purposefully done) goes black for a few seconds and then goes back to video. I dont know if that may affect it or not.
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Postby bobstur » Wed May 09, 2007 1:26 am

Scintilla wrote:@bobstur: VirtualDubMod can encode MPEG-2 files?

Anyway, what were your encoding settings? I remember having this kind of problem once before, and I want to say that reducing the maximum bitrate would fix it, but I'm not sure.

i think with plugins will can encode MPEG 2 . dunno. i havent done it before. i know that river past video cleaner can encode MPEG 2. cuz i use to do it. XD
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Postby OhmGautama » Wed May 09, 2007 6:01 pm

I tried to lower the bitrate but it didnt help. I switched over from MPEG-2 to MPEG-1 , and the MPEG-1 version worked fine too, even with a high bitrate. It must have something to do with the MPEG-2 , but what Im still not sure.
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Postby Scintilla » Wed May 09, 2007 7:06 pm

You said it was on a scene of pure black, right? How about <i>raising</i> the <i>minimum</i> bitrate -- say, to about 500 Kbps -- and enabling padding not to be less than that?
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Postby OhmGautama » Wed May 09, 2007 9:00 pm

Ah that must have been it! Thanks so much! Thanks for your suggestion as well bobstur. I tried a minimum of 500 kb/s but still came up with the same problem, so I went for broke and put it at 10000 kb/s and that got it. Of course I got a 400 mb mpeg-2 file but at least I know what I need to do now. Thanks again, very helpful! :D
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Postby Keeper of Hellfire » Thu May 10, 2007 12:30 pm

RathiSponge wrote:I tried a minimum of 500 kb/s but still came up with the same problem, so I went for broke and put it at 10000 kb/s and that got it.
I hope that's a typo and you did set the minimum rate to 1,000 kb/s.

While all other settings read like for DVD, the maximum bit rate isn't. For a DVD, the sum of all streams must not exceed 9,800 kb/s
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Postby OhmGautama » Thu May 10, 2007 1:19 pm

Yes I set it to 10000 kb/s. I was going for broke just to see if the minimum bitrate was the problem that I was having and it was. I am curious though you say the total bitrate for DVDs must not exceed 9,800 kb/s, but the contest in which I am entering the AMV says it will take up to 12 megabits/s maximum bitrate. Am I misunderstanding something from the contest or about bitrates? Or are you referring to if I wish to burn this AMV to a DVD, I would have to lower the maximum/minimum bitrate?
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Postby Keeper of Hellfire » Thu May 10, 2007 1:43 pm

If the contest rules allow such high bit rates, it's ok. Probably they don't use a DVD player for playback. I was assuming that it was made for burning on a Video DVD, and yes, if you want to you have to lower the bit rates to conform the standard.

One thing that might help you to overcome the high minimum bit rates is to reduce the blackness of the black frame. In RGB values - don't make it 0,0,0, make it 16,16,16.
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Postby OhmGautama » Thu May 10, 2007 2:13 pm

Ah ok. I created in Adobe Premiere Pro the "black video", but I don't see where to adjust the RGB values in Adobe though. Is it something you have to adjust elsewhere?
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Postby Keeper of Hellfire » Thu May 10, 2007 3:22 pm

I don't use APP, so I don't know if it's possible or how to do it. But my program allows me to create colored rectangle of any RGB value. If that's impossible in APP, you can use a drawing program to create a solid color picture with that values and import it into APP.
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Postby OhmGautama » Thu May 10, 2007 4:03 pm

Ah ok Thanks Ill definitely try that! :D
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