Quantcast Intermittent Audio Problem with KVCD on Playback? - digitalFAQ.com Forums [Archives]
  #1  
09-15-2003, 04:56 PM
KickingKarlB KickingKarlB is offline
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May I start by saying how delighted I am to be part of this forum, I know that kvcd will enrich my life and have already achieved moderate success in the week I have been encoding my own kvcds, due to this forum.

In the main I have used "the idiots guide" as well as bits of other peoples guides to cobble together some of my own kvcds from avi.

I am amazed at the results, the fact that I have already myself encoded 2hrs 10 min "vcd" quality (352x240) onto 1 80min CD, which played extremely well apart from the small problem I will outline.

I have also been brave enough to encode a 1hr 40min "dvd" quality (704x480) onto 1 80min CD, with amazing picture quality but with a little more of the same problem.

The problem is that I seem to get an audio stutter, which sounds a little like a morsecode beep, quite fast and loud, distorting the sound so as to make background noise/music unhearable, which comes and goes to varying degrees and may only happen once or twice in 2 hours (as per my 2hr 10min "vcd" adventure) or can be more apparent (as on my 1hr 40min "dvd" adventure) However I have noticed it to an extent in every kvcd I have played in my standalone dvd player (LG), whether made by myself or d/l from net.

I noticed last night the noise seemed to pick up more in scenes where there was bright light, more action and in particular there was a scene which had fire/flames in it which sent beeping over the top, next scene - no fire - no beeping, next scene - fire - the beeping returned? Due to this I'm not sure its anything to do with the audio coding?

I am using TMPGEnc to do the video and TooLAME via TMPGEnc for the audio. I then Simple Multiplex using TMPGEnc but have found that despite reference being made to Multiplexing an MPEG 1 Video CD (Non Standard) the files double in size and therefore cannot be burnt onto a CD, so have gone for the MPEG 1 System (Automatic) which creates a filesize similar to the video and audio added together (seems to make sense?).

I make a note here of stating that after the above process has finished there is usually a message about some bad packets and that it may not play properly. However the resuting file seems to play fine on my PC.

I burn with VCDEasy, and this gives me a message about the file needing "autopadding" (someone please explain this for me?) however while burning it says it will add this on the fly. I also notice that VCDEasy gives a warning about the audio bitrate being excessively large and it should be "?". However all the CDs I have burned have played fine except for the intermittant problem outlined?

If anyone can shed ANY light on ANY of the above I really will be very greatful.... I hope that outlining the above I have been as infomative as possible but not been too much of a bore!!

I look forward to hearing from someone..... Thankyou!!!

KickingKarlB
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  #2  
09-16-2003, 11:14 AM
Jellygoose Jellygoose is offline
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Now that's alot to shed light on.
Ok it seems like your player doesn't like high bitrates for MPEG-1. What was your Max-Bitrate you used in your encodings ? You can also analyze your specific file with a program called bitrate viewer, to determine the exact maximal bitrate used in that encode.
What was your audio bitrate you used by the way?
As for multiplexing: I have never ever heard that muxing as Video CD (Non Standard) will DOUBLE the size of your MPEG. You should try to mux your files with BBMPEG, (guides are around) and see if the problem still exists.
Some players might have problems with a KVCD muxed as MPEG-1 Automatic.
As for padding: As far as I know padding of the audio is necessary for VCDs to avoid buffer underruns/overruns by the player (please correct me if I'm wrong) therefor it's useful to pad your KVCD, while I think that TMPGENc will do that automatically while muxing and there's an extra option for padding in BBMPEG. Padding on the fly is not very safe and might lead to some problems.
one other hint:
- Make sure you encode your audio at 44.1khz and NOT 48khz.
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09-16-2003, 12:01 PM
KickingKarlB KickingKarlB is offline
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Thanks for the reply! I have deleted the files I have used, however the next film I encode I will check the bitrate etc.... I tried audio at 112, 128 and 160, all with a similar result.

I have already tried to use bbmpeg for my multiplexing, however this program seems a bit unstable on my system. Hopefully I will Multiplex a Video CD (Non Standard) to a similar size as the originals using this (I may have exagerated when I said doubled, maybe 50% bigger?)

I have ensured that all audio is 44.1khz so I know this is not the problem.

Thanks for your help and I'll be sure to let you know what works (if I find out!)

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09-18-2003, 03:00 PM
KickingKarlB KickingKarlB is offline
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Well, got bbmpeg working....

Is there anyway of joining two parts of a film without using tmpgenc as as soon as I do this it re muxes and I need auto padding again...?

Sorry for being so lame to ask, but I feel so close and I just want to get where I'm going in the fstest time....

Thanks

Kick.
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09-19-2003, 01:44 AM
Boulder Boulder is offline
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I've done merging and remuxing this way:

1) Demux the files you want to join, make sure you get both the video and audio file!
2) Use TMPGEnc's MPEG Tools, select Merge & cut.
3) Choose MPEG-1 Video CD (non-standard) from the slide menu.
4) Add the demuxed files you wish to join (select 'All files' from the slide menu so you can see the m1v files too)
5) Join the files.
6) Demux the joined file to separate video and audio files.
7) Mux those files in bbMPEG.
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