I have a Plextor ConvertX tv402u, which has an mpeg-1 encoder. The problem is that the darn thing seems to be producing mpeg-1 files that are not VCD compliant (despite the fact that I tell the capture tool to capture using "mpeg-1/VCD").
Isn't pointless to have non-VCD compliant mpeg-1 files? So when it comes time to author the file, it gets re-rendered, lowering the quality another notch and taking more time in the process, not to mention blowing the content into a larger footprint.
I imagine the only solution to this problem is to not use the Plextor. If no one has a better solution, then I'll let this thread serve to warn potential ConvertX buyers.
BTW- this is a followup to this no longer DivX related thread.
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Hello,
I had something similar with my hauppauge one time I believe. It wasn't producing compatible files if I remember correctly. A simple firmware upgrade solved the problem. Might want to give that a go.
KevinDonatello - The Shredder? Michelangelo - Maybe all that hardware is for making coleslaw? -
What are you using to author the file? What error message are you getting? I doubt the mpeg1 is really non-vcd compliant or if it is, its probably just incorrectly multiplexed which doesn't require any reauthoring.
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Originally Posted by adam
smart encoding enabled in both Video Studio 8 and Nero, to mitigate re-rendering.
Originally Posted by adam
Originally Posted by adam -
Nero will tell you what it is that is non-compliant about your file before just re-encoding. You must have disabled this option in the settings. I suggest you just look at the actual parameters of your file and decide yourself if there is something wrong. If its 352x240 23.976 or 29.97fps (for NTSC) or 352x288 25fps (for PAL) and encoded at 1150kbits CBR and the audio is 44100kHz, then the streams themselves are compliant. You can see these statistics by importing your mpg into VirtualDubMod and hitting file/file information.
In addition to having compliant streams, they must also be mutliplexed according to the VCD specifications, which require certain things for mux rate, packet size, etc... The fact that the filesize changes so much after re-encoding suggests to me that your mpg is in fact multiplexed incorrectly. Try using TMPGenc's mpeg tools to demultiplex and then remultiplex using the mpeg1 VCD setting.
That was typo in my post earlier. I meant to say that if your mpg is improperly multiplexed it won't require re-encoding, not reauthoring. -
Originally Posted by adam
Originally Posted by adam
Code:[!] MPEG: Anachronistic or discontinuous timestamp found in audio stream 0 at byte position 2340, from 0 to 152501. This may indicate an improper join. [!] MPEG: Anachronistic or discontinuous timestamp found in video stream 0 at byte position 4664, from 0 to 150150. This may indicate an improper join.
Originally Posted by adam -
VCD requires a CONSTANT bit rate of 1115 Kbps on the video. If your average bit rate is 731, yes, this is exactly why it is not compliant and why it is being re-encoded up to 1115 Kbps. This is why your files are growing (higher bit rate after encoding) and going down in quality. Surely you can fix this so you are encoding at the correct settings for VCD. If not, then I guess the Plextor card is not very good at all.
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Hi jgombos,
I have been using the VCD format now for 7 years and my experience is that most mpeg's that are not VCD compliant can usually be fixed without re-encoding.
The problem is that there are so many things that can be the reason why a mpeg is not VCD compliant and this makes it very difficult to know if your mpeg can be fixed without re-encoding.
vcd4ever.
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