problem with streaming mpeg ts when using ffmpeg muxer

[jingke2000]

Hi,

I got bunch of errors like this from both VLC 1.1.11 and VLC 2.0.0:

access_output_udp debug: late packet for udp input (3559046358000)
.......
access_output_udp debug: packet has been sent too late (3559046358000)
.......
stream_out_transcode debug: drift is too high, resetting master sync
.......

Here's the parameters I used:
:sout=#gather:transcode{vcodec=h264,vb=3000,fps=30,scale=1,width=1280,height=720,acodec=mp4a,ab=64,channels=2,samplerate=44100}:udp{mux=ffmpeg{mux=mpegts},dst=239.0.102.204:2222} :no-sout-rtp-sap :no-sout-standard-sap :ttl=1 :sout-keep :sout-mux-caching=5000

But it works fine if I simply replace "ffmpeg{mux=mpegts}" with the stock TS muxer like this:
:sout=#gather:transcode{vcodec=h264,vb=3000,fps=30,scale=1,width=1280,height=720,acodec=mp4a,ab=64,channels=2,samplerate=44100}:udp{mux=ts,dst=239.0.102.204:2222} :no-sout-rtp-sap :no-sout-standard-sap :ttl=1 :sout-keep :sout-mux-caching=5000

However, in my case, I'll need to use FFMPEG's ts muxer.

Any idea?

Thanks!

[Jean-Baptiste Kempf]

Try to increase caching.

[jingke2000]

I inceased the caching by doing "sout-mux-caching=500000". It didn't work. The error messages still occur.

Here's the full script if I use command line:

vlc dshow:// --dshow-vdev="screen-cap" --dshow-adev="audio-cap" :sout=#gather:transcode{vcodec=h264,vb=3000,fps=30,scale=1,width=1280,height=720,acodec=mp4a,ab=64,channels=2,samplerate=44100}:udp{mux=ffmpeg{mux=mpegts},dst=239.0.102.204:2222} :no-sout-rtp-sap :no-sout-standard-sap :ttl=1 :sout-keep :sout-mux-caching=500000

Thanks for the help!

[Jean-Baptiste Kempf]

500000 is too much. Increase dshow caching too.

[realjobe]

what does "sout-mux-caching" do anyhow? What does it effect? also what does "rtsp-caching" and "http-caching" do?
I also saw ":rtp{caching=2000,mux..."

so some clearification about all the Cache techniques would be nice.. since vlc 2.x my h264 transcoded realtime streams started to twitch & stutter and buffer...