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DVD playback problem

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Bob Cole
DVD playback problem
on Jun 23, 2005 at 3:44:30 pm

I've encoded a half-hour show several ways. In each case it plays perfectly on my home DVD player. But in a museum's JVC industrial player, it hangs at the same point half-way through. The image freezes, stays frozen for a few minutes, then pixelates and the audio gets very loud and crunchy, and the disk ejects from the player.

I've tried encoding with PCM and MPEG Layer 2->AC-3 audio.
Any suggestions would be most welcome.

-- Bob Cole


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Borjis
Re: DVD playback problem
on Jun 23, 2005 at 4:28:00 pm



Hi Bob,

I see your in the states, so you definitely don't want to
be using mpeg layer 2 for audio as most U.S. players don't
support it.

PCM should be avoided, so stick with AC-3 around 256kbps
or less.

For the video, make sure the bitrate does not exceed
7mbps. it can spike to it once in awhile but the average
bitrate should be 5 to 6mbps for the entire disc.

what kind of media were you using? at this point you should
consider Verbatim so you can rest easy knowing its not
the media.

and finally, try burning the disc at 1x. that can reduce
the amount of errors the player has to correct during playback.

good luck.
and please do share what you found worked.



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Bob Cole
Re: DVD playback problem
on Jun 23, 2005 at 4:43:35 pm

[Borjis] "you definitely don't want to
be using mpeg layer 2 for audio as most U.S. players don't
support it.

PCM should be avoided, so stick with AC-3 around 256kbps
or less."


My encoder (Mainconcept in the Stream package for the Digital Rapids card) offers PCM and MPEG Layer 2. I opted for a non-multiplexed (sep. video and audio file) encoding, so that in Adobe Encore I could transcode the audio to AC-3. I am not sure from that point on. Encore says it is transcoding, but I have looked at the "transcoded" folder, right-clicked for properties, and all it will tell me is that the file is a WAV file.

Is there an analysis tool which would enable me to look at my files and tell me just what they are?

It strikes me as very odd that (1) the DVD fails at the same point every time and (2) no problems at all in a $150 home player, consistent problems in a $1000+ industrial player.

I'll try the burning-at-1x trick. Thanks!

-- BC


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Borjis
Re: DVD playback problem
on Jun 23, 2005 at 5:06:22 pm



look for an .ac3

maybe see what the ac-3 topic says in the help file?


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Robert E Wilson
Re: DVD playback problem
on Jun 23, 2005 at 8:45:37 pm

If you are using VBR encoding, make sure the maxiumum and minimum bitrates aren't too far apart (like 7000 and 2000). Some players have difficulties switching bitrates from one extreme to another and you get stuttering or pixelizing as you described. I usually use CBR at 7000 for this reason but if I use VBR, I go 7000 and 4000 and it's usually good with most players.


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Bob Cole
Solution: AC3
on Jun 27, 2005 at 12:38:08 am

Thanks all for your good ideas.

I checked to see whether Encore actually transcoded the .mp2 to .ac3, and after not finding any .ac3 files at all, I tried reimporting the .mp2 and transcoding yet again. This time, the transcode seemed to take much longer, and an .ac3 file was created.

I wish I could figure out what I did differently which resulted in success. But I'm going to be checking to see that an .ac3 file actually was created for awhile.

Thanks again!

-- Bob Cole



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