[FFmpeg-user] Problem using H263 Encoder

Tom Alter tom1.alter at gmail.com
Fri Mar 23 13:28:58 CET 2012

Thanks Rhodri for  your response..

I am setting following properties of Encoder:

bitrate:      150 kpbs
gop-size:   100

I have also tried following options:

mb-cmp:               2
ildct-cmp:              2
me-cmp:               2
me-sub-cmp:         2

One more thing, could you please share the difference between encoder
parameter *bitrate* and *max-key-interval?


On Thu, Mar 22, 2012 at 11:04 PM, Rhodri James <rhodri at kynesim.co.uk> wrote:

> On Thu, 22 Mar 2012 17:04:45 -0000, Tom Alter <tom1.alter at gmail.com>
> wrote:
>  Hi All,
>> I am using ffmpeg h263 encoder to encode the live stream and sending the
>> encoded stream to peer over RTP. Solution works one start but slowly video
>> quality gets degraded with time. After two to three hours video gets
>> blurred. I have tweaked with various settings of H263 Encoder but did not
>> able to fix the problem.
> All together now: command line and complete, uncut output missing :-)
>  Is anyone there who can suggest the reason of this behaviour? Any help
>> would be greatly appreciated.
> It sounds like you are seeing small errors accumulate over a long time,
> which suggests that the encoder isn't producing I-frames often enough
> (or at all).  It's impossible to tell without more information, but
> some combination of your target bit rate and encoder parameters may
> be, er, optimistic.
> --
> Rhodri James
> Kynesim Ltd
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