Buffer Underrun

This is the third time burning a 45min DVD has failed. What does buffer underrun mean??? I export a FCP Movie (QuickTime Movie) from FCP and then let DVD SP do the encoding...I've changed the default settings from Better to Best and from 1 Pass to 2 Pass VBR. What am I missing?
Thanks. Britt
I've included the log so hopefully the experts can see what's going wrong:
Starting DVD Build DANCEELEMENT2006...
Compiler Initializing...
Precompiling Project DANCEELEMENT2006
Compiling VMG Information...
Created 33 PGCs in VTSM1
Created 8 PGCs in VMG.
2 Menu(s) will be created...
Compiling Menu PGCs...
Compiling Menu#1 (Menu 1)...
Rendering Menu:Menu 1,Language:1...
Compiling Menu#2 (Menu 2)...
Rendering Menu:Menu 2,Language:1...
Generating Transition: VTSM #01, VOB #1...
Generating Transition: VTSM #01, VOB #2...
Generating Transition: VTSM #01, VOB #3...
Generating Transition: VTSM #01, VOB #4...
Generating Transition: VTSM #01, VOB #5...
Generating Transition: VTSM #01, VOB #6...
Generating Transition: VTSM #01, VOB #7...
Generating Transition: VTSM #01, VOB #8...
Generating Transition: VTSM #01, VOB #9...
Generating Transition: VTSM #01, VOB #10...
Generating Transition: VTSM #01, VOB #11...
Generating Transition: VTSM #01, VOB #12...
Generating Transition: VTSM #01, VOB #13...
Generating Transition: VTSM #01, VOB #14...
Generating Transition: VTSM #01, VOB #15...
Generating Transition: VTSM #01, VOB #16...
Generating Transition: VTSM #01, VOB #17...
Generating Transition: VTSM #01, VOB #18...
Generating Transition: VTSM #01, VOB #19...
Generating Transition: VTSM #01, VOB #20...
Generating Transition: VTSM #01, VOB #21...
Generating Transition: VTSM #01, VOB #22...
Generating Transition: VTSM #01, VOB #23...
Generating Transition: VTSM #01, VOB #24...
Generating Transition: VTSM #01, VOB #25...
Writing VIDEO_TS.VOB
1 VTSs and 1 Titles will be created...
Compiling VTS#1 (Track 1)...
Muxing VTS011.VOB
Internal Muxer Error
Build cancelled
Formatting finished.
Building was not successful. See log.
G5 Mac OS X (10.3.9) DVD SP 4.0.3

There are a few ways you can use Toast to burn your DVD.
The following way is the best way to use DVD SP and Toast integrated together.
Author your DVD in DVD SP, be sure to have All Regions checked.
When it is all finished, select Build/Format.
Select your appropriate folder to build your VIDEO_TS and AUDIO_TS folder, then select output device>Harddrive, then DDP 2.0 is set by default.
You will be prompted to save the DVD.img file to your drive. Rename it to your DVD like MY_MOVIE.img or whatever your DVD is called.
When it finishes building/formatting, close DVD SP.
Open up Toast and select COPY
I have Toast 7 so this is how it works.... (Toast 5 did it differently, but still you need to burn a .img file)
Select COPY, then IMAGE FILE to the left.
Drop your .img file into the main window, hit the RECORD button.
This will bring up a prompt for a write speed.
If you are making a master, it is advised to use the lowest speed possible (1X DVD), if you DVDR will let you.
Some only go as low as 4X. I typically use 4X because i use 16X Verbatim media and it only goes to 4X.
A full 4.37gb DVD at 1X is like 55 minutes. 2x is 27min, 4x is 14 min, and so on.
But this is the best way to make a master.
Then you can make copies from this at a higher speed if you want.
Be sure to VERIFY the disc after it burns. It will prompt you to do so.
You can also use the VIDEO tab and select DVD-Video from VIDEO_TS on the left. I would advise against this method although you can. It has to do with the way DVD SP builds your VIDEO_TS folders. Although you set it to all region, if you just BUILD the project it has a RCM Value (Region Code Mask) of 64 (0 is all region). It has a bug which deselects Region 7. Not sure why, but it does.
So if you Build/Format, it will be RCM Value of 0.
That is why it is best to do an .img file and burn in Toast which is better burning software.
Hope this info helps.

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Hi spaceface:
Sorry you're still having this problem.
There are a lot of suggestions in these articles:
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http://docs.info.apple.com/article.html?artnum=25750
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I usually get(something like this)
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This question came up just about a week ago - run a search for buffer underrun in the forum. The situation occurs when the DVD writer is left waiting for data to be sent to it... it's buffer runs out of data. This is usually caused by the main processor being used by some other process and not being able to keep a steady stream of data being sent to the writer.

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"Errors found during the burning process....illegal request: Buffer underrun (0x21, 0x02)"
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Thanks, Kim

Hello Kim,
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iDVD 4 disc image burning can be enabled through the patch HPfurz:
http://homepage.mac.com/geerlingguy/macsupport/mac_help/pages/0015-burn_idvdother.html
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Need help, iMovie project is 3hrs 59mins, disk image
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Prevention is checked in Recorder settings.
I've gone done to the slowest write speed with the
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Thankyou Michel.
My project is two Final Cut pro movies - 45 minutes in total, 13 chapters in segment (30 mins), none in the other (15mins)
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[tuner card] cx88 alsa buffer under-run (on xc4000)

I'm having really weird bug and I don't know where should I look for help.
I own Leadtek WinFast DTV2000 H Plus card with Conexant CX2388x PCI bridge and Xcieve XC4000 tuner.
I'm using it with mplayer to watch analog cable tv. I'm suffering from buffer underrun caused by alsa driver (cx88_alsa). What's more interesting it's occurring more often when I'm watching channels only on specific frequencies (mostly high). The side effect of this is that mplayer (also mplayer2) has a memory leak which causes to drop frames after aprox. 10 minutes.
When I'm having underruns dmesg shows something like this:
May 26 11:26:12 localhost kernel: [81922.660861] cx88[0]: irq aud [0x1101] dn_risci1* dnf_of dn_sync*
May 26 11:26:14 localhost kernel: [81924.159913] cx88[0]: irq aud [0x1101] dn_risci1* dnf_of dn_sync*
May 26 11:26:16 localhost kernel: [81926.855046] cx88[0]: irq aud [0x1101] dn_risci1* dnf_of dn_sync*
May 26 11:26:19 localhost kernel: [81929.550115] cx88[0]: irq aud [0x1101] dn_risci1* dnf_of dn_sync*
May 26 11:26:22 localhost kernel: [81932.245248] cx88[0]: irq aud [0x1101] dn_risci1* dnf_of dn_sync*
May 26 11:26:25 localhost kernel: [81935.341748] cx88[0]: irq aud [0x1001] dn_risci1* dn_sync*
May 26 11:26:25 localhost kernel: [81935.352431] cx88[0]: irq aud [0x1101] dn_risci1* dnf_of dn_sync*
May 26 11:26:25 localhost kernel: [81935.352440] cx88[0]: irq aud [0x1001] dn_risci1* dn_sync*
I've figured a simple workaround but it's causing sound stuttering on high frequencies (because of more buffer underruns). Disable audio in mplayer and run:
sox -t alsa hw:1,0 -t alsa hw:0,0
I've found similar problem but no one has found a soultion: http://www.digipedia.pl/usenet/thread/17087/5974/
I've tried also applying workaround from https://bugs.launchpad.net/ubuntu/+sour … bug/836062 post #5 but it doesn't work.
I really don't know where should I report this bug. Any help will be really appreciated.
Info and configs:
lspci:
08:07.0 Multimedia video controller: Conexant Systems, Inc. CX23880/1/2/3 PCI Video and Audio Decoder (rev 05)
Subsystem: LeadTek Research Inc. Device 6f42
Flags: bus master, medium devsel, latency 32, IRQ 21
Memory at f9000000 (32-bit, non-prefetchable) [size=16M]
Capabilities: <access denied>
Kernel driver in use: cx8800
08:07.1 Multimedia controller: Conexant Systems, Inc. CX23880/1/2/3 PCI Video and Audio Decoder [Audio Port] (rev 05)
Subsystem: LeadTek Research Inc. Device 6f42
Flags: bus master, medium devsel, latency 32, IRQ 21
Memory at fb000000 (32-bit, non-prefetchable) [size=16M]
Capabilities: <access denied>
Kernel driver in use: cx88_audio
08:07.2 Multimedia controller: Conexant Systems, Inc. CX23880/1/2/3 PCI Video and Audio Decoder [MPEG Port] (rev 05)
Subsystem: LeadTek Research Inc. Device 6f42
Flags: bus master, medium devsel, latency 32, IRQ 21
Memory at fa000000 (32-bit, non-prefetchable) [size=16M]
Capabilities: <access denied>
Kernel driver in use: cx88-mpeg driver manager
mplayer config:
# Write your default config options here!
tv=driver=v4l2:input=1:norm=PAL-DK:channels=119250-ch1,127250-ch2,135250-ch3,143250-ch4,151250-ch5,159250-ch6,167250-ch7,175250-ch8,183250-ch9,191250-ch10,199250-ch11,215250-ch12,223250-ch13,231250-ch14,239250-ch15,247250-ch16,255250-ch17,263250-ch18,271250-ch19,279250-ch20,287250-ch21,295250-ch22,303250-ch23,311250-ch24,319250-ch25,327250-ch26,335250-ch27,343250-ch28,351250-ch29,359250-ch30,367250-ch31,375250-ch32,383250-ch33,391250-ch34,399250-ch35,407250-ch36,415250-ch37,423250-ch38,431250-ch39,439250-ch40,447250-ch41,455250-ch42,463250-ch43,471250-ch44,479250-ch45,487250-ch46,495250-ch47,503250-ch48,511250-ch49,527250-ch50,535250-ch51,591200-ch52
Example output of sox underruns:
hw:1,0: (alsa)
Encoding: Signed PCM
Channels: 2 @ 16-bit
Samplerate: 48000Hz
Replaygain: off
Duration: unknown
In:0.00% 00:00:00.17 [00:00:00.00] Out:4.10k [ | ] Clip:0 sox WARN alsa: under-run
In:0.00% 00:00:02.05 [00:00:00.00] Out:94.2k [ | ] Clip:0 sox WARN alsa: under-run
In:0.00% 00:00:03.24 [00:00:00.00] Out:152k [ -|- ] Clip:0 sox WARN alsa: under-run
In:0.00% 00:00:04.78 [00:00:00.00] Out:225k [ | ] Clip:0 sox WARN alsa: under-run
In:0.00% 00:00:07.17 [00:00:00.00] Out:340k [ | ] Clip:0 sox WARN alsa: under-run
In:0.00% 00:00:08.53 [00:00:00.00] Out:406k [ | ] Clip:0 sox WARN alsa: under-run
In:0.00% 00:00:10.07 [00:00:00.00] Out:479k [ -|- ] Clip:0 sox WARN alsa: under-run
In:0.00% 00:00:11.43 [00:00:00.00] Out:545k [ | ] Clip:0 sox WARN alsa: under-run
In:0.00% 00:00:13.14 [00:00:00.00] Out:627k [ | ] Clip:0 sox WARN alsa: under-run
In:0.00% 00:00:14.51 [00:00:00.00] Out:692k [ | ] Clip:0 sox WARN alsa: under-run
In:0.00% 00:00:15.70 [00:00:00.00] Out:750k [ | ] Clip:0 sox WARN alsa: under-run
In:0.00% 00:00:16.55 [00:00:00.00] Out:791k [ | ] Clip:0 sox WARN alsa: under-run
In:0.00% 00:00:18.77 [00:00:00.00] Out:897k [ | ] Clip:0 sox WARN alsa: under-run
In:0.00% 00:00:19.97 [00:00:00.00] Out:954k [ | ] Clip:0 sox WARN alsa: under-run
In:0.00% 00:00:20.31 [00:00:00.00] Out:971k [ | ] Clip:0 sox WARN alsa: under-run
In:0.00% 00:00:22.19 [00:00:00.00] Out:1.06M [ | ] Clip:0 sox WARN alsa: under-run
In:0.00% 00:00:23.38 [00:00:00.00] Out:1.12M [ -|- ] Clip:0 sox WARN alsa: under-run
In:0.00% 00:00:24.58 [00:00:00.00] Out:1.18M [ | ] Clip:0 sox WARN alsa: under-run
In:0.00% 00:00:25.77 [00:00:00.00] Out:1.23M [ -|- ] Clip:0 sox WARN alsa: under-run
In:0.00% 00:00:26.97 [00:00:00.00] Out:1.29M [ | ] Clip:0 sox WARN alsa: under-run
In:0.00% 00:00:28.16 [00:00:00.00] Out:1.35M [ | ] Clip:0 sox WARN alsa: under-run
In:0.00% 00:00:30.21 [00:00:00.00] Out:1.45M [ | ] Clip:0 sox WARN alsa: under-run
In:0.00% 00:00:31.23 [00:00:00.00] Out:1.50M [ | ] Clip:0 sox WARN alsa: under-run
In:0.00% 00:00:32.94 [00:00:00.00] Out:1.58M [ | ] Clip:0 sox WARN alsa: under-run
In:0.00% 00:00:33.96 [00:00:00.00] Out:1.63M [ | ] Clip:0 sox WARN alsa: under-run
In:0.00% 00:00:35.33 [00:00:00.00] Out:1.69M [ | ] Clip:0 sox WARN alsa: under-run
In:0.00% 00:00:36.86 [00:00:00.00] Out:1.77M [ | ] Clip:0 sox WARN alsa: under-run
In:0.00% 00:00:38.06 [00:00:00.00] Out:1.82M [ | ] Clip:0 sox WARN alsa: under-run
In:0.00% 00:00:39.08 [00:00:00.00] Out:1.87M [ -|- ] Clip:0 sox WARN alsa: under-run

Hi mate,
Just to let you know you are not alone. I have the same issue with Leadtek WinFast DTV2000 H (rev. J) card. It's card=82 on the cx88 driver support list on v4l site.
I'm seeing the same messages on Mythbuntu Lucid 10.04 I just noticed it today troubleshooting some tunning issue. I found some other people having same issue dating from 2007 and 2009 with some other cards too, not sure if the same driver though.
$ dmesg | egrep "cx2388|dvb|DVB|cx88"
[ 18.686379] cx88/2: cx2388x MPEG-TS Driver Manager version 0.0.7 loaded
[ 18.686470] cx88/0: cx2388x v4l2 driver version 0.0.7 loaded
[ 18.698803] cx88[0]: subsystem: 107d:6f2b, board: WinFast DTV2000 H rev. J [card=82,autodetected], frontend(s): 1
[ 18.698805] cx88[0]: TV tuner type 63, Radio tuner type -1
[ 18.701199] cx2388x alsa driver version 0.0.7 loaded
[ 18.916524] tuner 0-0043: chip found @ 0x86 (cx88[0])
[ 18.927543] tuner 0-0061: chip found @ 0xc2 (cx88[0])
[ 18.988392] input: cx88 IR (WinFast DTV2000 H rev. as /devices/pci0000:00/0000:00:14.4/0000:03:07.2/input/input6
[ 18.988524] cx88[0]/2: cx2388x 8802 Driver Manager
[ 18.988555] cx88-mpeg driver manager 0000:03:07.2: PCI INT A -> GSI 21 (level, low) -> IRQ 21
[ 18.988565] cx88[0]/2: found at 0000:03:07.2, rev: 5, irq: 21, latency: 32, mmio: 0xfb000000
[ 18.988572] IRQ 21/cx88[0]: IRQF_DISABLED is not guaranteed on shared IRQs
[ 18.989608] cx8800 0000:03:07.0: PCI INT A -> GSI 21 (level, low) -> IRQ 21
[ 18.989618] cx88[0]/0: found at 0000:03:07.0, rev: 5, irq: 21, latency: 32, mmio: 0xfa000000
[ 18.989630] IRQ 21/cx88[0]: IRQF_DISABLED is not guaranteed on shared IRQs
[ 18.989753] cx88[0]/0: registered device video0 [v4l2]
[ 18.989804] cx88[0]/0: registered device vbi0
[ 18.989852] cx88[0]/0: registered device radio0
[ 19.007549] cx88/2: cx2388x dvb driver version 0.0.7 loaded
[ 19.007554] cx88/2: registering cx8802 driver, type: dvb access: shared
[ 19.007557] cx88[0]/2: subsystem: 107d:6f2b, board: WinFast DTV2000 H rev. J [card=82]
[ 19.007561] cx88[0]/2: cx2388x based DVB/ATSC card
[ 19.007563] cx8802_alloc_frontends() allocating 1 frontend(s)
[ 19.007791] cx88_audio 0000:03:07.1: PCI INT A -> GSI 21 (level, low) -> IRQ 21
[ 19.007801] IRQ 21/cx88[0]: IRQF_DISABLED is not guaranteed on shared IRQs
[ 19.007827] cx88[0]/1: CX88x/0: ALSA support for cx2388x boards
[ 19.036402] DVB: registering new adapter (cx88[0])
[ 19.036405] DVB: registering adapter 0 frontend 0 (Conexant CX22702 DVB-T)...
[ 28.937066] cx88[0]: irq aud [0x1001] dn_risci1* dn_sync*
[ 28.937078] cx88[0]: irq aud [0x1001] dn_risci1* dn_sync*
[ 28.937089] cx88[0]: irq aud [0x1001] dn_risci1* dn_sync*
[ 28.937097] cx88[0]: irq aud [0x1001] dn_risci1* dn_sync*
[ 28.937105] cx88[0]: irq aud [0x1001] dn_risci1* dn_sync*
[ 28.937113] cx88[0]: irq aud [0x1001] dn_risci1* dn_sync*
[ 28.937129] cx88[0]: irq aud [0x1001] dn_risci1* dn_sync*
[ 28.937137] cx88[0]: irq aud [0x1001] dn_risci1* dn_sync*
[ 28.937145] cx88[0]: irq aud [0x1001] dn_risci1* dn_sync*
Some of them solved their issue by unloading the cards ALSA driver cx88_alsa but not sure if that is a good idea since that module is used by snd_pcm and will probably have audio impact.
My IRQ assignments:
$ cat /proc/interrupts
CPU0 CPU1
0: 27 115 IO-APIC-edge timer
1: 0 2 IO-APIC-edge i8042
4: 0 2 IO-APIC-edge
6: 0 5 IO-APIC-edge floppy
7: 0 0 IO-APIC-edge parport0
8: 0 1 IO-APIC-edge rtc0
9: 0 0 IO-APIC-fasteoi acpi
12: 0 4 IO-APIC-edge i8042
14: 0 0 IO-APIC-edge pata_atiixp
15: 0 0 IO-APIC-edge pata_atiixp
16: 0 1223 IO-APIC-fasteoi ohci_hcd:usb3, ohci_hcd:usb4, HDA Intel
17: 0 0 IO-APIC-fasteoi ehci_hcd:usb1
18: 1 28 IO-APIC-fasteoi ohci_hcd:usb5, ohci_hcd:usb6, ohci_hcd:usb7
19: 3454 25488 IO-APIC-fasteoi ehci_hcd:usb2, HDA Intel
21: 676891 17268 IO-APIC-fasteoi cx88[0], cx88[0], cx88[0]
22: 0 3 IO-APIC-fasteoi ohci1394
25: 42059 164 PCI-MSI-edge eth0
26: 3 635727 PCI-MSI-edge ahci
27: 0 0 PCI-MSI-edge fglrx[0]@PCI:1:5:0
NMI: 0 0 Non-maskable interrupts
LOC: 5877466 5852321 Local timer interrupts
SPU: 0 0 Spurious interrupts
PMI: 0 0 Performance monitoring interrupts
PND: 0 0 Performance pending work
RES: 2710497 3588734 Rescheduling interrupts
CAL: 1027 64 Function call interrupts
TLB: 91005 89118 TLB shootdowns
TRM: 0 0 Thermal event interrupts
THR: 0 0 Threshold APIC interrupts
MCE: 0 0 Machine check exceptions
MCP: 115 115 Machine check polls
ERR: 2
MIS: 0
The card is sharing the same IRQ 21 for all three devices I guess DVB, analog TV and radio.
03:07.0 Multimedia video controller: Conexant Systems, Inc. CX23880/1/2/3 PCI Video and Audio Decoder (rev 05)
Subsystem: LeadTek Research Inc. Device 6f2b
Flags: bus master, medium devsel, latency 32, IRQ 21
Memory at fa000000 (32-bit, non-prefetchable) [size=16M]
Capabilities: <access denied>
Kernel driver in use: cx8800
Kernel modules: cx8800
03:07.1 Multimedia controller: Conexant Systems, Inc. CX23880/1/2/3 PCI Video and Audio Decoder [Audio Port] (rev 05)
Subsystem: LeadTek Research Inc. Device 6f2b
Flags: bus master, medium devsel, latency 32, IRQ 21
Memory at f9000000 (32-bit, non-prefetchable) [size=16M]
Capabilities: <access denied>
Kernel driver in use: cx88_audio
Kernel modules: cx88-alsa
03:07.2 Multimedia controller: Conexant Systems, Inc. CX23880/1/2/3 PCI Video and Audio Decoder [MPEG Port] (rev 05)
Subsystem: LeadTek Research Inc. Device 6f2b
Flags: bus master, medium devsel, latency 32, IRQ 21
Memory at fb000000 (32-bit, non-prefetchable) [size=16M]
Capabilities: <access denied>
Kernel driver in use: cx88-mpeg driver manager
Kernel modules: cx8802
I'm using this card on MythTV setup for watching and recording DVB-T TV and can't say I've noticed any sound issues during playback. But what I've noticed is that the card can't tune some DVB channels here in Australia after I upgraded to MythTV 0.25 and Mythbuntu 10.04.
If you ask me this issue should go to the v4l list since I think is driver related.
Cheers,
Igor

Another headache - "problem during multiplexing/burning - buffer underun"

Hello,
After many iDVD issues, I finally got the burning process of my DVD project.. half way through it spit my DVD out and gave me these errors:
"Errors were found during the burning process:
The recording device reported the illegal request: Buffer underrun. (0x21, 0x02.)
There was a problem during multiplexing/burning."
What is this supposed to mean and how can I just burn my DVD?!
Thank you
Chris

It's been awhile since I had this error crop up, but I know 2 things that caused it for me.
1) Bad DVD media. It happened a lot when I was using some cheap, off brand DVD-R's. More expensive Sony DVD's (white) are much better and more consistent. The time wasted with bad burns from bad DVD media is not worth the time.
2) It could even be a problem with your DVD burner going bad, but not as likely. I did have one SuperDrive replaced because I started having problems even with good, recommended brands of DVD media. However, try getting some better media first. Don't buy a lot. Try out a small package of DVD-R's or buy a disc from a friend to try out a brand.
Another possibility: Lack of sufficient, free hard drive space. Here's what iDVD 6's help file states:
"When you burn a DVD, iDVD needs temporary space on your hard disk to store the encoded files for your project. To burn your iDVD project to a single-layer DVD disc, you should have 8-10 gigabytes (GB) of free disk space on your hard disk, depending on the size of your project. For double-layer discs, you need 15-20 GB of free disk space."
Apple's support forum describes "buffer underrun" in more detail at:
http://docs.info.apple.com/article.html?artnum=25750
You might also want to defragment your hard drive (with a 3rd party utiility such as TechTool Pro) so that you don't have a fragmented hard drive when burning a project.
Speed rating of the DVD media- I've seen reports that some SuperDrives work best with media rated the same as it's maximum burn speed (e.g.- 4x, 8x, etc). I would recommend trying to find media that matches your SuperDrive burn speed, or no more than twice the burn speed.
I hope this helps.
You didn't mention which version of iDVD you were using or which operating system. Sometimes other users have tips for you based on that info.

Buffer Underrun

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