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All technical archives.

The mechanism is simple like this: 1. Pull/Clone your own repository(which was forked from another repository) to a local PC. 2. Add remote source repository to a tag of the local copy. 3. Do local merge for the two repositories. 4. Resolve the conflications if exists. 5. Commit the local […]

A simple script to sync a forked repository with the ...

2015/05/08 in Technical tagged git / github / SCM by Jacky Wei

This question was origined from an experience of conferencing with different meeting terminals, including Polycom, Cisco, Tandburg, Huawei, etc. In our current implementation of SIP conference, we are using a stream_id tag in the Video Fast Update command to tell the peer we are requesting an Intra frame for a […]

Media Control(Video Picture Fast Update) mechanism for SIP

2015/04/29 in Technical tagged SIP by Jacky Wei

Details of the issue: The situation is H600 can establish H.460 calls with most of the GKs around the world, but failed to a Polycom GK. Allow me to explain the details of this issue: 1. Caller: Group500, callee: H600, GK/MCU: Polycom RMX 2000 2. Group500 sent a call to […]

Failed to establish H.460 call through Polycom MCU issue

2015/04/27 in Technical tagged H.460 / Polycom by Jacky Wei

As I knew, H.264 ES stream file can be played back by CorePlayer(Commercial version of MPlayer). But not VLC Player. But as I was told that someone did use VLC Player to player H.264 ES stream file. So made some further dig into this issue, turned out the old version […]

Make VLC player to support play H.264 ES stream file

2015/04/02 in Technical tagged VLC by Jacky Wei

Backgroud: 1. Both H800 and Avaya MCU 5110 support up to H.264 1080P video. 2. Avaya MCU supports 720P video when conferencing with Avaya endpoints(XT1000) 3. H800 Called by(Or calling to) Avaya(RADVision) MCU 5110, the opened video channel can only max to 4CIF.

OLC process rule of Avaya MCU 5110

2015/03/30 in Technical tagged Avaya / H.323 / RADVISION / TCS by Jacky Wei

x264 project added OpenCL video acceleration to it’s implementation early at about 2013(not sure with the date), and my goal here is test the video encoding performance of x264 when with OpenCL video accelerator enabled. Test hardware environments: HP Pavilion 14 1. Graphic card: NVIDIA GeForce GT730M card. 2. CPU: […]

Step by step to enable x264 with OpenCL – NVIDIA ...

2015/03/25 in Technical tagged CUDA / GPU / NVIDIA / OpenCL by Jacky Wei

Ran into a meeting bit rate related issue when conferencing with Polycom MCU. Here is the situation:

A flow control rule of Polycom MCU

2015/03/20 in Technical tagged H.323 by Jacky Wei

I submitted a patent paper, Data transmission method for video conferencing and video conferencing systems, to my parent agent early at Sep, 2014. It is a patent with H.460 involved, origin from the V5.0 platform system. But did not get any feedback until the Chinese New Year of 2015. And […]

Patent: Data transmission method for video conferencing and video conferencing ...

2015/03/12 in Technical tagged H.323 / H.460 / Patent by Jacky Wei

GUID, Globally Unique Identifier, aka UUID(Universally Unique Identifier), is very useful when you need a global identifier in you program. GUID is a 128-bit integer number used to identify resources. The term GUID is generally used by developers working with Microsoft technologies, while UUID is used everywhere else.

A simple implementation of GUID/UUID

2015/03/10 in Technical tagged GUID / RFC4122 / UUID by Jacky Wei

I was having problem while updating one of my plugin weeks ago, telling me that Could not create directory. /home/<>/public_html/wp-content/plugins/download-manager Plugin install failed. or Unable to locate WordPress Content directory (wp-content).

Solution to fix WordPress update failure issue

2015/03/01 in Technical / Website tagged WordPress by Jacky Wei

This version of Visual Studio requires a computer with a newer version of Windows — Before the story, I’d like to say Happy Chinese New Year to you all, and wish you a great year of 2015. It was about compiling latest source code of WebRTC (NOT A TECH TIP). Here we go.

A story of re-installing WebRTC developing environment

2015/02/24 in Technical tagged VS2013 / WebRTC by Jacky Wei

Days earlier, ran into an issue which was H.323 ID related when conferencing with CISCO and LIFESIZE endpoints. Normally we got used to set the H.323 ID with any charactors we want. But seems some manufacturors like CISCO and LIFESIZE don’t think it appropriate, because they are adapting some rules […]

About alias: H.323 ID

2015/02/13 in Technical tagged Cisco / H.323 / H.323 ID / LIFESIZE by Jacky Wei

As you know, there are LIMIT settings in Linux OS which may have something to do with some frequent-happen-issue. Such as stack size, open files, core file generation, etc. Here are some tips about ulimit, core, and some debugging tricks relevant. 1. ulimit comamnd —————————— To view your OS limitations, […]

Debugging & troubleshooting tutorial: core dump debug

2015/01/27 in Technical tagged GDB / troubleshooting / ulimit by Jacky Wei

Encountered a capability negotiation issue when conferencing with a HUAWEI terminal. It happened in a dual stream(H.239) capability negotiation. Environments: 1. According to the H.245 TCS, both terminal have 1080P 60 fps capability. 2. The band width setting was extreme low. 3. HUAWEI sent a OLC request with 4CIF H.264 […]

[H.323] TCS negotiation rule of HUAWEI

2015/01/19 in Technical tagged H.264 / H.323 / TCS by Jacky Wei

Encounter a H.264 video capability issue while conferencing with HUAWEI TEx0 MT. Both MTs(H800 and TEx0) have 1080P 60 fps H.264 video capability, but HUAWEI MT will send an OLC request with 1080P 30 fps when starting open the logical channel, while conferencing with Cisco MTs, this issue doesn’t happen. […]

An issue about HUAWEI TEx0 H.264 video capability calculating

2015/01/08 in Technical tagged H.264 / H.323 / HUAWEI / MaxFS / MaxMBPS / TCS / TEx0 by Jacky Wei