Why do lossless codecs have Bitstream bombs.

[Canada]

Why do lossless codecs have Bitstream bombs, and Dolby Digital and DTS on dvd are fine and don't have Bitstream bombs.

[BIslander]

Originally Posted by Canada

Why do lossless codecs have Bitstream bombs, and Dolby Digital and DTS on dvd are fine and don't have Bitstream bombs.

I believe the "bitstream bomb" was a problem with some early dts-MA decoders which has been fixed with firmware updates by the AVR manufacturers.

[krazeyeyez]

Yep, my Integra DTR-6.8 and Panasonic Blu had this all the time, Integra had a firmware update to fix this on their site, but not for my particular model. Apparently there was one just not online, so once i got in touch with their customer support they sent me the disc, instructions, etc... got here fast too. It only happened on some of the earlier blu-ray releases for me though, i think the last movie to do it was AVP requiem, all movies after that were fine pre-firmware update.

[JBL4645]

A bitstream bomb? what does it sound like? This is news to me?

[JBL4645]

I see it’s it a bit more detailed here in this thread over at Digital Home.
http://www.digitalhome.ca/forum/showthread.php?t=83474

Right gotcha that doesn’t sound healthy at all and a sudden burst will bugger your speakers up!

I’ll make a note of this and tread carefully with some dtsHDMA titles only a few titles.

1408
* Golden Compass (BD)
* The Fly (BD)
* Chronos (BD)
* Fantastic Four (BD)
* Hannibal Rising (HD DVD)
* Close Encounters of the Third Kind (BD)
* Eagles Farewell Concert (HD DVD)

1408
* Golden Compass (BD)
* The Fly (BD) - 13:00
* Chronos (BD) - 38:52
* Fantastic Four (BD) - 4:22 or 4:35
* Hannibal Rising (HD DVD)
* Close Encounters of the Third Kind (BD) - 23:40
* Eagles Farewell Concert (HD DVD)
* Flight of the Phoenix (BD) -51:00
* Flyboys (BD)

Bugger me! To think I was thinking of buying new Onkyo AVR and it would be just my luck if it buggers my JBL speakers up! I’m going for Yamaha soon.

I’m glad I stop buy this thread for an investigation!

I’m reading down the other thread and they mention Yamaha WTF! What is this some consumer conspiracy scam by manufactures to milk more money from us or some Muppet in the mastering of Bluray titles this is the last thing I want to read about!

I’m not reading all though the AVS thread its like watching paint dry! I get the whole idea of now.

I tell you strange thing! This happened with few DVD region 2 titles Pearl Harbour and The Untouchables special edition on my Kenwood KRF-X9050D THX select model.

The Dolby digital signal produced a tar, tar, tar razzy like raw digital noise with the soundtrack still playing but the noise was just…turn it OFF!

I took both back and changed it for something else this was at least 5 years ago.

I later brought a first edition of The Untouchables I think it was late last year and was fearing the same issue. No it played just fine.

So the coding must have gotten messed up on few titles and the word is its something to do with the Motorola chip in my Kenwood? But this is only 2 titles out of some 1K that I have.

But this bitstream dts bomb this sounds nasty! So yes I’ll be keep a very high caution on this issue, as there may be few dodgy ones circling around and this firmware that fixes it, seems like they knew about it all along.

It’s a good thing I have the Behreinger DCX2496 with the audio limiters turned ON! Lets see if the dts bitsrteam bomb can get past that!

[krazeyeyez]

It didn't mess up my speakers, but i had to change my underwear a few times because it sounds like a sudden gun shot out of nowhere.

[JBL4645]

Originally Posted by krazeyeyez

It didn't mess up my speakers, but i had to change my underwear a few times because it sounds like a sudden gun shot out of nowhere.

LMAO That bad huh!

So let me get this straight LOL then. you had meal during the day, you stop of at a local Kmat buy the next must see Bluray, take it home then have this itching urge to go to the toilet when all of sudden Dirty Harry says Make LOL My Day and you let one go in your underpants!

So I guess you had to scrub the sofa clean as well then. LOL

WARNING go to the toilet first before playing this Bluray dtsHDMA disc!


Do you think its possible for you to make youtube video with one of the audio channels from the AVR patched directly to the pc so we can hear this sound first hand!

Also it would be then easy for me to play this on my sound system only monitoring it on the RTA to see how many db this rises over the soundtrack, I bet its at least 20db from the sounds of it! That is bad!

[JBL4645]

I’m still laughing mate that was too funny I don’t know Bluray had sense of humour behind it. Oh, too funny.

I guess the second biggest explosion was in your underpants!oh my god how embarrassing.

I didn’t realize Bluray can be a messy affair?

[ZoetMB]

You know that actually can happen. Very loud low frequency sudden noise could cause someone to drop their bowels. When very high powered sound systems were first used at discos, this would happen to people every once in a while (all the drugs and alcohol probably didn't help either).

They used to call this phenomena "disco dump".

Strangely enough, I haven't heard about this happening recently, even though sound systems are even higher powered now than they were then.

[bhampton]

DTS has always been flakey.

Back in the days of DVD people wouldn't read up on DTS and they would try to play it back on systems that had Dolby Digital only causing digital noise similar to bit stream bombs of this generation.

Thankfully, The PS3 can convert everything losslessly to digital PCM. Makes setting up a AVR a lot simpler. All you have to do is calibrate the PCM input on the AVR (assuming you do that detailed of a setup anyway.)

-Brian

[Blu-Dog]

Originally Posted by Canada

Why do lossless codecs have Bitstream bombs, and Dolby Digital and DTS on dvd are fine and don't have Bitstream bombs.

These were issues with the decoding chips on certain models of receivers, using the Audyssey format. Firmware revisions fixed these problems.

I only heard of this on a couple of models of Onkyo and Denon receivers, and it's a thing of the past. Receivers showing this problem can be repaired with a firmware upgrade.

It's not a current problem.

[JBL4645]

Originally Posted by ZoetMB

You know that actually can happen. Very loud low frequency sudden noise could cause someone to drop their bowels. When very high powered sound systems were first used at discos, this would happen to people every once in a while (all the drugs and alcohol probably didn't help either).

They used to call this phenomena "disco dump".

Strangely enough, I haven't heard about this happening recently, even though sound systems are even higher powered now than they were then.

Yeah I guess it was high energy release. The place must have reeked badly!

Wasn't brown noise?


Better call in dyno-rod!

Originally Posted by bhampton

DTS has always been flakey.

Back in the days of DVD people wouldn't read up on DTS and they would try to play it back on systems that had Dolby Digital only causing digital noise similar to bit stream bombs of this generation.

Thankfully, The PS3 can convert everything losslessly to digital PCM. Makes setting up a AVR a lot simpler. All you have to do is calibrate the PCM input on the AVR (assuming you do that detailed of a setup anyway.)

-Brian

Yeah I know what that sounds like now you mentioned it. I did a few only occasions had short burst of noise digital raw bitstream. This only happened when searching visually though the disc and when playing again, it produced a loud raw digital bitstream.

Another strange one is during visual search sometimes and the sound mix will get sent to different channels. Like centre channel will get sent to (right surround and right surround to centre) weird huh.