[mpeg2] Problems with encoding...

To: mpeg2@linuxtv.org
Subject: [mpeg2] Problems with encoding...
From: Lawrence Gold <gold@shell.aros.net>
Date: Wed, 21 Feb 2001 19:27:26 -0700
Hi,

I have a certain video clip I'm trying to encode, and so far I get a
garbled mpeg stream every time.  It's particularly bad with mpeg-1 (I get
a good streem for a few seconds and then it breaks down), but does better
with mpeg-2.  Other clips I've encoded have fared better, but I get the
occasional corruption there too.  If it'd be helpful, I can show you
mpeg_stat's output for one of the corrupt streams...

The only pattern I've seen so far is that "kfir ready" displays in the
console at the time of the corruption and then keeps being displayed a
bunch of times, sometimes in bursts.  Also, occasionally I get a "kfir:
irq loop".

One idea I had was that when this "kfir ready" condition occurs, the DMA
buffer doesn't contain valid data and shouldn't be copied into
kfir->mpgbuf.  Or else the DMA buffer is only partly filled with valid
data.

None of the changes I've tried in the code has made a difference, though,
so my assumptions (guesses, really) about the state of the buffer are
probably incorrect.

Does anyone have any suggestions?

In case it's helpful, here's the output of my 'lspci -vvx'.  Notice that
the kfir, USB, and SCSI devices all share IRQ 15 (I disabled the second
IDE interface in the hopes of preventing the triple IRQ sharing, but no
luck).


00:00.0 Host bridge: Intel Corporation 440BX/ZX - 82443BX/ZX Host bridge
(rev 03)
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B-
	Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort+ >SERR- <PERR-
	Latency: 32
	Region 0: Memory at d0000000 (32-bit, prefetchable) [size=64M]
	Capabilities: <available only to root>
00: 86 80 90 71 06 00 10 22 03 00 00 06 00 20 00 00
10: 08 00 00 d0 00 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
30: 00 00 00 00 a0 00 00 00 00 00 00 00 00 00 00 00

00:01.0 PCI bridge: Intel Corporation 440BX/ZX - 82443BX/ZX AGP bridge
(rev 03) (prog-if 00 [Normal decode])
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B-
	Status: Cap- 66Mhz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
	Latency: 64
	Bus: primary=00, secondary=01, subordinate=01, sec-latency=32
	Memory behind bridge: d4000000-d7ffffff
	Prefetchable memory behind bridge: d8000000-d9ffffff
	BridgeCtl: Parity- SERR- NoISA- VGA+ MAbort- >Reset- FastB2B+
00: 86 80 91 71 07 01 20 02 03 00 04 06 00 40 01 00
10: 00 00 00 00 00 00 00 00 00 01 01 20 f0 00 a0 02
20: 00 d4 f0 d7 00 d8 f0 d9 00 00 00 00 00 00 00 00
30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 88 00

00:07.0 ISA bridge: Intel Corporation 82371AB PIIX4 ISA (rev 02)
	Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B-
	Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
	Latency: 0
00: 86 80 10 71 0f 00 80 02 02 00 01 06 00 00 80 00
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00:07.1 IDE interface: Intel Corporation 82371AB PIIX4 IDE (rev 01)
(prog-if 80 [Master])
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B-
	Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
	Latency: 32
	Region 4: I/O ports at f000 [size=16]
00: 86 80 11 71 05 00 80 02 01 80 01 01 00 20 00 00
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: 01 f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00
30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00:07.2 USB Controller: Intel Corporation 82371AB PIIX4 USB (rev 01)
(prog-if 00 [UHCI])
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B-
	Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
	Latency: 32
	Interrupt: pin D routed to IRQ 15
	Region 4: I/O ports at d000 [size=32]
00: 86 80 12 71 05 00 80 02 01 00 03 0c 00 20 00 00
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: 01 d0 00 00 00 00 00 00 00 00 00 00 00 00 00 00
30: 00 00 00 00 00 00 00 00 00 00 00 00 0f 04 00 00

00:07.3 Bridge: Intel Corporation 82371AB PIIX4 ACPI (rev 02)
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B-
	Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
00: 86 80 13 71 03 00 80 02 02 00 80 06 00 00 00 00
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00:09.0 Multimedia controller: Visiontech Ltd: Unknown device 8000 (rev
5e)
	Subsystem: Visiontech Ltd: Unknown device 0200
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B-
	Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
	Latency: 32 (8000ns max), cache line size 08
	Interrupt: pin A routed to IRQ 15
	Region 0: Memory at db301000 (32-bit, non-prefetchable) [size=256]
	Region 1: I/O ports at d400 [size=256]
	Region 2: Memory at db000000 (32-bit, non-prefetchable) [size=2M]
	Region 3: Memory at db302000 (32-bit, non-prefetchable) [size=1K]
	Capabilities: <available only to root>
00: 1f 14 00 80 07 00 90 02 5e 00 80 04 08 20 00 00
10: 00 10 30 db 01 d4 00 00 00 00 00 db 00 20 30 db
20: 00 00 00 00 00 00 00 00 00 00 00 00 1f 14 00 02
30: 00 00 00 00 40 00 00 00 00 00 00 00 0f 01 00 20

00:0b.0 Ethernet controller: Intel Corporation 82557 [Ethernet Pro 100]
(rev 08)	Subsystem: Intel Corporation EtherExpress PRO/100+
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B-
	Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
	Latency: 32 (2000ns min, 14000ns max), cache line size 08
	Interrupt: pin A routed to IRQ 10
	Region 0: Memory at db300000 (32-bit, non-prefetchable) [size=4K]
	Region 1: I/O ports at d800 [size=64]
	Region 2: Memory at db200000 (32-bit, non-prefetchable) [size=1M]
	Expansion ROM at <unassigned> [disabled] [size=1M]
	Capabilities: <available only to root>
00: 86 80 29 12 07 00 90 02 08 00 00 02 08 20 00 00
10: 00 00 30 db 01 d8 00 00 00 00 20 db 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 86 80 0b 00
30: 00 00 00 00 dc 00 00 00 00 00 00 00 0a 01 08 38

00:0d.0 Multimedia audio controller: Ensoniq ES1370 [AudioPCI] (rev 01)
	Subsystem: Unknown device 4942:4c4c
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B-
	Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=slow >TAbort-
<TAbort+ <MAbort+ >SERR- <PERR-
	Latency: 32 (3000ns min, 32000ns max)
	Interrupt: pin A routed to IRQ 11
	Region 0: I/O ports at dc00 [size=64]
00: 74 12 00 50 05 01 00 34 01 00 01 04 00 20 00 00
10: 01 dc 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 42 49 4c 4c
30: 00 00 00 00 00 00 00 00 00 00 00 00 0b 01 0c 80

00:11.0 SCSI storage controller: Symbios Logic Inc. (formerly NCR) 53c875
(rev 26)
	Subsystem: Tekram Technology Co.,Ltd. DC390F Ultra Wide SCSI
Controller
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B-
	Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
	Latency: 32 (4250ns min, 16000ns max), cache line size 08
	Interrupt: pin A routed to IRQ 15
	Region 0: I/O ports at e000 [size=256]
	Region 1: Memory at db303000 (32-bit, non-prefetchable) [size=256]
	Region 2: Memory at db304000 (32-bit, non-prefetchable) [size=4K]
	Expansion ROM at <unassigned> [disabled] [size=64K]
	Capabilities: <available only to root>
00: 00 10 0f 00 07 00 10 02 26 00 00 01 08 20 00 00
10: 01 e0 00 00 00 30 30 db 00 40 30 db 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 e1 1d 04 39
30: 00 00 00 00 40 00 00 00 00 00 00 00 0f 01 11 40

01:00.0 VGA compatible controller: Matrox Graphics, Inc. MGA G400 AGP (rev
04) (prog-if 00 [VGA])
	Subsystem: Matrox Graphics, Inc. Millennium G400 MAX/Dual Head
32Mb
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B-
	Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
	Latency: 32 (4000ns min, 8000ns max), cache line size 08
	Interrupt: pin A routed to IRQ 5
	Region 0: Memory at d8000000 (32-bit, prefetchable) [size=32M]
	Region 1: Memory at d4000000 (32-bit, non-prefetchable) [size=16K]
	Region 2: Memory at d5000000 (32-bit, non-prefetchable) [size=8M]
	Expansion ROM at <unassigned> [disabled] [size=64K]
	Capabilities: <available only to root>
00: 2b 10 25 05 07 00 90 02 04 00 00 03 08 20 00 00
10: 08 00 00 d8 00 00 00 d4 00 00 00 d5 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 2b 10 79 21
30: 00 00 00 00 dc 00 00 00 00 00 00 00 05 01 10 20
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