Splitter Buffer Underruns with High-Bitrate M2TS Files over MoCA

[GoogleCodeExporter]

LAV Splitter x86 version 0.50.5 used in conjunction with x86 MPC-HC version 
1.6.2.4360 and LAV Video and Audio 0.50.5.

Playback of some high bitrate (~38 Mbps stream) material (m2ts ripped directly 
from Blu-ray) will stutter due to buffer underruns according to buffer 
statistics in MPC-HC. Switching the splitter to MPC-HC native splitter 
alleviates the issue.

The source file is located on a network server. The playback PC is connected to 
the server via MoCA network. 

Network connection:

Playback PC <-> GigE switch <-> MoCA bridge (FastEthernet to Coax) <-coax-> 
MoCA Bridge <-> GigE switch <-> GigE switch <-> File Server

While MoCA network has plenty of bandwidth to sustain 90 Mbps+ file transfers 
it surely has some additional latency not present in an all Ethernet network. 
Ping times are 3-4 ms when idle. When playing the file back with MPC-HC as the 
splitter, ping times over about 1 minute were: min=2ms, max=15ms and avg. = 
6ms. 

The issue doesn't seem to repeat when playback PC is directly connected to same 
GigE switch as server.

Original issue reported on code.google.com by aaron.th...@gmail.com on 4 Jun 2012 at 5:03

[GoogleCodeExporter]

I don't have any environment to test this, but i do know that the mpeg-ts 
demuxer is not performing seeks or other latency intensive operations, so that 
a constant stream of data should be fine.

I created a build with increased read buffer sizes, maybe you can try it and 
see if it helps?
http://files.1f0.de/lavf/LAVFilters-0.50.5-23-iobuffers.zip

Original comment by h.lepp...@gmail.com on 12 Jun 2012 at 10:33

• Changed state: Accepted
• Added labels: Component-ffmpeg, Filter-Splitter, Performance, Type-Enhancement
• Removed labels: Type-Defect

[GoogleCodeExporter]

This build does fix this issue. Buffers are no longer running out and video 
playback seems okay now with files that previously were causing issues.

Original comment by aaron.th...@gmail.com on 12 Jun 2012 at 1:37

[GoogleCodeExporter]

Great, i'll add it for the next version then.

Original comment by h.lepp...@gmail.com on 12 Jun 2012 at 1:38

• Changed state: Fixed