> > Message: 4 > Date: Tue, 12 Jul 2011 02:14:16 +0000 > From: BONNEAU Guy <gbonn...@miranda.com> > To: LIVE555 Streaming Media - development & use > <live-de...@ns.live555.com> > Subject: Re: [Live-devel] TestH264VideoStreamer lags in VLC > Message-ID: > < > 24665ddc0d7cf047bd6471a56e615ea631812...@ca-ops-mailbox.miranda.com> > Content-Type: text/plain; charset="us-ascii" > > Perhaps a bug in VLC..... > > I tried with Elecard Stream Eye application and it does see 4 frames per > second (progressive) in the H264 header and plays at such rate. > > GB > > From: live-devel-boun...@ns.live555.com [mailto: > live-devel-boun...@ns.live555.com] On Behalf Of Ross Finlayson > Sent: Monday, July 11, 2011 20:30 > To: LIVE555 Streaming Media - development & use > Subject: Re: [Live-devel] TestH264VideoStreamer lags in VLC > > Here is an example file : > http://www.mediafire.com/?rm6v38vx15nd9dv > When I play it with VLC in my computer it plays normally. So I guess, as a > encoder output is fine. But when I use for example TestH264VideoStreamer to > stream it, what the client (also with VLC) sees is much more slow. It is > like viewing 1 fps, although this sequence's frame rate is much higher. > > Actually, "testH264VideoStreamer" thinks that the frame rate is 4 > frames-per-second, and is streaming at that rate. However, VLC seems to > stream at about 6 times that rate - i.e., at about 24 frames-per-second. > > So, my question - for H.264 experts - is the following: What is VLC seeing, > in this file, that makes it see a frame rate of 24 frames-per-second, or so? > > Our code ("H264VideoStreamFramer") is seeing > num_units_in_tick: 1 > time_scale: 8 > fixed_frame_rate_flag: 1 > and from this is inferring a frame rate of 4 frames-per-second. So how is > VLC inferring a much higher frame rate?? > > -- > > Ross Finlayson >
Thank you both for your feedback. Actually I am setting FPS=4 in the encoder parameters, so it should be 4. Did you try to stream using live555 lib and view it in VLC or did you just open it a disk file? Because as I mentioned, when I run it just a file from disk, it plays normally, without lags or strange frame rates. But when I use the testH264VideoStreamer or the testOnDemandRTSPServer applications, I get this strange behavior. So I assume, it only has to do with the streaming parameters of the encoding (NAL parameters?). I am not really a h264 expert, just making some thoughts. Maybe someone can explain this strange behavior. Thanks once more, Sokratis
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