Just installed tcm flv player on htc hd2 cell phone with Windows 6. some realplayer downloaded videos are not responding mentioning the player does not possessions a video codec for the file. can I get that codec and install to overcome this problem

Unfortunately, your phone is running Windows Mobile 6.5, which was planned to have flash made for it, but no longer will due to the launch of Windows Phone 7. Sorry to be the bearer of bad news.
Source

for htc desire download the SYNC software for the ANDROID DEVICE form here ;

http://www.htc.com/www/supportdownloadlist.aspx?p_id=312&act=sd&cat=all

install it and connect the phone with usb cable and run this app.

but if you have HD2 then,

for htc HD2 windows mobile : download the WMDC (windows mobile device center) for win7/vista PC or PC SYNC 4.5 for XP and install it to use your Windows phone 6.5 device.

I have the exact same phone. I use windows media player to play all my video playback on my HD2. The video format is WMA. Also, when trying to use a different video type you will not be able to see any video but you can see images.

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You should first convert the flv videos to mp4 format and then you can enjoy the videos on your phone. Here is one link could do a favor to you: http://www.convertflvtomp4.biz/convert-flv-to-mp4.html
Check it to have a try. Hope this can help you.

Maybe your code and resolution is not suitable to HTC, you can find a video converter just like Leawo Video Converter, you can choose the output profile as HTC HD2 or set as 800*640 resolution.

If you already downloaded the FLV file follow these steps:
1. 1. Download and install a program called Realplayer SP here: http://download.cnet.com/RealPlayer-SP/3000-13632_4-10073040.html
2. 2. Once installed, Open Realplayer SP, then click file then Open, find the FLV file and open it, and hover the mouse over the video that is playing and on the bottom you will see a button that says “Convert”

3. 3. Click Convert at the bottom of the video, a small window will popup with your video in the list, at the bottom it will say convert to, click the drop down list then select black berry curve or HTC incredible, both of these file formats should play in your phone

4. 4. Click the Green start button at the bottom and wait for it to convert

5. 5. Go to My Documents folder in windows and open up My Videos and your video should be there.

Spanish version:

Si usted ya ha descargado el archivo FLV siga estos pasos:
1. Descargar e instalar un programa llamado RealPlayer SP aqu?:
http://download.cnet.com/RealPlayer-SP/3000-13632_4-10073040.html

2. Una vez instalado, abrir RealPlayer SP, a continuaci?n, haga clic en el archivo haga clic en Abrir, busque el archivo FLV y abierto , y pasa el rat?n sobre el v?deo que se est? reproduciendo y en el fondo usted ver? un bot?n que dice "Convertir"

3. Haga clic en Convertir en la parte inferior del video, una peque?a ventana emergente con un video en
la lista, en la parte inferior dir? convertir, haga clic en la lista desplegable a continuaci?n, seleccione bayas negro curva o incre?ble HTC, ambos formatos de archivo debe jugar en su tel?fono

4. Haga clic en el bot?n de inicio verde en el fondo y esperar a que se convierta

5. Ir a la carpeta Mis documentos en las ventanas y abrir Mis v?deos y el v?deo se debe
all?.

Youtube videos play in .flv format.Download an flv player or better yet get realplayer which plays and also saves .flv files to watch at your own time.

I have the HD2. I have to install code pack called CCCP to play my video on my pc. It's come with a Zoom player too. http://www.cccp-project.net/download.php?type=cccp