On my ION CUDA Asrock 330HT, mp4 files take an eternity before playback starts.
Video/audio Drivers are latest etc. This is a Win 8 machine. I had this issue on Win 7 too.
Any other format/container seem to play well.
----- Sys info:
Library
Total files: 101637
Audio files: 78456
Image files: 17902
Video files: 5045
Other files: 234
Processing
Thumbnails built: 1% (805 of 101637)
Audio analyzed: 100% (83501 of 83501)
Background Tools Running
No tools currently running
Power
Mode change (disable screensaver, keep monitor on) [expires in 26 seconds]
Media Center
Version: 19.0.104.0
Install path: C:\Program Files (x86)\J River\Media Center 19\
Interface plug-ins: Interface Plugins: TiVo Server (not running)
JRMark: never run
Memory used: 104 MB memory
Handles used: 483 handles
Advanced System Info
Memory & CPU
CPU features: Atom, MMX, SSE2, SSE3, SSSE3
Free Physical Memory: 1.8 GB
Total Memory: 3.2 GB
Operating System
Microsoft Windows 8 64-bit
Audio inputs and outputs
Digital Audio (S/PDIF) (High Definition Audio Device) (driver 6.2.9200.16384)
NVIDIA HDMI Out (NVIDIA High Definition Audio) (driver 6.2.9200.16384)
Computer
ACPI x64-based PC (driver 6.2.9200.16384)
DiskDrive
INTEL SSDSA2M080G2GC ATA Device (driver 6.2.9200.16736)
Display
NVIDIA ION (driver 9.18.13.3165)
hdc
ATA Channel 0 (driver 6.2.9200.16548)
ATA Channel 1 (driver 6.2.9200.16548)
Standard Dual Channel PCI IDE Controller (driver 6.2.9200.16548)
HIDClass
HID-compliant consumer control device (driver 6.2.9200.16384)
HID-compliant consumer control device (driver 6.2.9200.16384)
HID-compliant device (driver 6.2.9200.16769)
HID-compliant device (driver 6.2.9200.16769)
HID-compliant device (driver 6.2.9200.16769)
HID-compliant device (driver 6.2.9200.16769)
HID-compliant device (driver 6.2.9200.16769)
HID-compliant device (driver 6.2.9200.16769)
HID-compliant device (driver 6.2.9200.16769)
HID-compliant device (driver 6.2.9200.16769)
Microsoft eHome Infrared Transceiver (driver 6.2.9200.16384)
Nuvoton W836x7HG CIR Device Driver (driver 1.8.2009.514)
USB Input Device (driver 6.2.9200.16769)
USB Input Device (driver 6.2.9200.16769)
Keyboard
HID Keyboard Device (driver 6.2.9200.16548)
Microsoft eHome MCIR 109 Keyboard (driver 6.2.9200.16384)
Microsoft eHome MCIR Keyboard (driver 6.2.9200.16384)
Microsoft eHome Remote Control Keyboard keys (driver 6.2.9200.16384)
MEDIA
High Definition Audio Device (driver 6.2.9200.16653)
NVIDIA High Definition Audio (driver 1.3.26.4)
Monitor
Generic PnP Monitor (driver 6.2.9200.16548)
Mouse
HID-compliant mouse (driver 6.2.9200.16548)
HID-compliant mouse (driver 6.2.9200.16548)
HID-compliant mouse (driver 6.2.9200.16548)
Net
NVIDIA nForce Networking Controller (driver 7.3.1.7336)
Qualcomm Atheros AR9285 Wireless Network Adapter (driver 3.0.0.130)
Print queues
Fax (driver 6.2.9200.16384)
Microsoft XPS Document Writer (driver 6.2.9200.16384)
Root Print Queue (driver 6.2.9200.16384)
Processor
Intel(R) Atom(TM) CPU 330 @ 1.60GHz (driver 6.2.9200.16451)
Intel(R) Atom(TM) CPU 330 @ 1.60GHz (driver 6.2.9200.16451)
Intel(R) Atom(TM) CPU 330 @ 1.60GHz (driver 6.2.9200.16451)
Intel(R) Atom(TM) CPU 330 @ 1.60GHz (driver 6.2.9200.16451)
SCSIAdapter
Microsoft Storage Spaces Controller (driver 6.2.9200.16731)
Software devices
[snip]
System
ACPI Fixed Feature Button (driver 6.2.9200.16384)
ACPI Power Button (driver 6.2.9200.16384)
Composite Bus Enumerator (driver 6.2.9200.16384)
Consumer IR Devices (driver 6.2.9200.16384)
Direct memory access controller (driver 6.2.9200.16384)
High Definition Audio Controller (driver 6.2.9200.16420)
High precision event timer (driver 6.2.9200.16384)
Microsoft ACPI-Compliant System (driver 6.2.9200.16420)
Microsoft Basic Display Driver (driver 6.2.9200.16384)
Microsoft Basic Render Driver (driver 6.2.9200.16384)
Microsoft System Management BIOS Driver (driver 6.2.9200.16384)
Microsoft Virtual Drive Enumerator (driver 6.2.9200.16384)
Microsoft Windows Management Interface for ACPI (driver 6.2.9200.16384)
Motherboard resources (driver 6.2.9200.16384)
Motherboard resources (driver 6.2.9200.16384)
Motherboard resources (driver 6.2.9200.16384)
Motherboard resources (driver 6.2.9200.16384)
Numeric data processor (driver 6.2.9200.16384)
NVIDIA nForce PCI System Management (driver 6.2.9200.16384)
PCI bus (driver 6.2.9200.16384)
PCI standard host CPU bridge (driver 6.2.9200.16384)
PCI standard ISA bridge (driver 6.2.9200.16384)
PCI standard PCI-to-PCI bridge (driver 6.2.9200.16384)
PCI standard PCI-to-PCI bridge (driver 6.2.9200.16384)
PCI standard PCI-to-PCI bridge (driver 6.2.9200.16384)
PCI standard RAM Controller (driver 6.2.9200.16384)
PCI standard RAM Controller (driver 6.2.9200.16384)
PCI standard RAM Controller (driver 6.2.9200.16384)
Plug and Play Software Device Enumerator (driver 6.2.9200.16384)
Programmable interrupt controller (driver 6.2.9200.16384)
Remote Desktop Device Redirector Bus (driver 6.2.9200.16384)
System board (driver 6.2.9200.16384)
System CMOS/real time clock (driver 6.2.9200.16384)
System speaker (driver 6.2.9200.16384)
System timer (driver 6.2.9200.16384)
UMBus Root Bus Enumerator (driver 6.2.9200.16384)
Volume Manager (driver 6.2.9200.16384)
USB
Generic USB Hub (driver 6.2.9200.16655)
Standard Enhanced PCI to USB Host Controller (driver 6.2.9200.16655)
Standard OpenHCD USB Host Controller (driver 6.2.9200.16655)
USB Root Hub (driver 6.2.9200.16655)
USB Root Hub (driver 6.2.9200.16655)
VolumeSnapshot
Generic volume shadow copy (driver 6.2.9200.16384)
Generic volume shadow copy (driver 6.2.9200.16384)