Webcam video recording bandwidth

Forum|Forum|19 years ago
November 27, 2006
2 replies
398 views

hi all,

When capturing a webcam feed using FMS - is there any loss of information during the upload process?

If my client has a limited uplink (for instance a poor DSL uplink bandwidth) - does the resulting FLV file will suffer from lost frames etc.? (is RTMP reliable or lossy)

If not lossy- how does it works?? does Flash client buffer the recorded webcam feed on the client (because of the upload limitations)?

where can I find more formal information about this (searched FMS docs with no luck),

thx,

Chen.

This topic has been closed for replies.

S

Stellar_Sunbeam157FAuthor

Participant

thanks Jay,

What happens to the client side netstream buffer when I stop recording - is it going to continue uploading the buffered frames/audio or will it be lost?

A

Anonymous

quote:

Originally posted by: Chen.Bekor
thanks Jay,

What happens to the client side netstream buffer when I stop recording - is it going to continue uploading the buffered frames/audio or will it be lost?

It's up to you to do that in your client side AS.

To stop recording, you want to first detach the camera and mic from the netstream, and then start checking the buffer. Once the buffer is empty, then stop publishing. That way, the stream doesn't stop publishing until the buffer is empty, and you don't lose the end of your video.

If you look at the code in the videorecord component, you'll see an example of how this is done.

A

Anonymous

Yes... the Flashplayer will drop frames if the client's connection to the server isn't fast enough. You can set the amount of data that is bufferred on the client (see the FMS docs about the client side netstream buffer), but if the buffer fills and can't empty out to the server, you'll start losing frames.

As I understand things, audio takes precidence over video, so video frames will drop before audio data is dropped.

What you might want to do is test your client's connection speeds (you can do that with FMS), and then employ a little dynamic bitrate/framerate control in your client side AS. That way, you can ensure that the client doesn't try to transmit more data than their internet pipe can handle, and you won't lose and data.

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