I am using RTSPClientExample to record H264 videos from stream its working fine for HikVision camera but not in flir camera. When i record stream from flir camera i only see blank screen

[praveenbinomial]

I am using RTSP Client to record H264 videos from stream its working fine for HikVision camera but not in flir camera. When i record stream from flir camera i only see blank screen

[Revan1985]

Check if the h264 nals contains the intial 0x00 0x00 0x00 0x01 header.
I have found a similar problem for some cameras at works, and resolved checking for it and add when needed...
or you could try to debug the h264 and check if there are any errors in the parsing for the flir camera streaming...
This is the only thing I can think about, I don't know this kind of cameras, sorry

This is the code I use for this purpose

`bool frame_i = nal_units.Any(n => ((n.Span[0] >> 0) & 0x1F) == 5);

if (frame_i)
{
if (!ArrayUtils.StartsWith(_sps, 0, 4, [0x00, 0x00, 0x00, 0x01])) { bufferMemoryStream.Write([0x00, 0x00, 0x00, 0x01], 0, 4); }
bufferMemoryStream.Write(_sps, 0, _sps.Length);
if (!ArrayUtils.StartsWith(_pps, 0, 4, [0x00, 0x00, 0x00, 0x01])) { bufferMemoryStream.Write([0x00, 0x00, 0x00, 0x01], 0, 4); }
bufferMemoryStream.Write(_pps, 0, _pps.Length);
}`

You need to do the same later for the nal units when saving the frame info.

bufferMemoryStream is a MemoryStream that holds the required informations.
Remember, if you receive an I frame, you must save also the sps and pps information (as in code), not all the software can render h264 right if this info is missing.

[praveenbinomial]

Thank you for reaching out, this is very helpful,
I have done lot of changes on my project and after that
foreach (byte[] nal_unit in nal_units)
{
if (nal_unit.Length>2)
{
fs_v.Write(new byte[] { 0x00, 0x00, 0x00, 0x01 }, 0, 4); // Write Start Code
fs_v.Write(nal_unit, 0, nal_unit.Length); // Write NAL
}

}
this is working for me.
Thank you.