The VideoLAN Forums

I have downloaded latest sources from git and compiled with the decklink sdk option. I'm being able to capture video from the video card, but when I try to save this to a file, I start getting errors of "PTS is less than DTS" from the x264 encoder. My command line is:

./vlc -vvv decklink:// --sout='#transcode{vcodec=h264,acodec=mp4a}:std{access=file,dst=/home/video.ts}' --decklink-card-index=0 --decklink-mode=ntsc --decklink-audio-connection=analog --decklink-audio-rate=48000 --decklink-audio-channels=2 --decklink-video-connection=composite --decklink-aspect-ratio=4:3

If I try to stream this instead of saving it to a file, I get rid of this error messages and start getting "late buffer for mux input" tons of times, which apparently has no effect on the quality of the video streamed.

Im on a Core2Duo with 2gig RAM running Ubuntu Server 11.10.

So, my question is: what am I doing wrong here??? I've read tons of posts and didnt manage to find an answer for this.

Kind Regards,

Juan Martin Runge

please share the whole logs.

Jean-Baptiste, thanks for your answer and sorry for delayed response, was out of town... Here is my command line: And my log is Thanks in advance!

Juan Martin

More details:

Command line: Log

And last test:
Log:
Did remove a lot of "main warning: late buffer for mux input (1301588)" because the server kept failing to send the post!

hi.. i having the same problem...
streaming from intensity pro gives lots of "late buffer for mux input", did not try saving to file but i get the "pts less than dts" while streaming.
when i start the streaming i get only late buffer errors, after several hours i start getting "pts less than dts" in an intermittant times and after a while the "pts less than dts" is all over the place. the "late buffer" apparently does not affect quality, but "pts" errors are show killers the stream is "unwatchable" with all moving objects leaving trails and artifacts.
restarting vlc will fix it for a few second, the only solution is to remove the blackmagic kernel module and re-loading it.

using vlc 2.0.2 on fedora 17 64bit.
is it an issue with vlc, vlc decklin module, or blackmagic drivers??

The same story for me, I try streaming from file and errors are the same. It is not cpu problem because I tried with small resolution video and i7 cpu is loaded about 15%.
Here is the 360p video: http://www.quirksmode.org/html5/videos/ ... _bunny.mp4

For test , I just use simpe configuration from gui, CTRL+S, add video, add HTTP destination, encapsulation MPEG-TS, Video Codec h264 600k, ( :sout=#transcode{vcodec=h264,vb=600,scale=0,acodec=mpga,ab=128,channels=2,samplerate=44100}:http{mux=ts,dst=:8080/} :sout-keep)

and errors are the same on both on Windows and Linux, versions 1.1.9 and 2.03.


I guess something is wrong with VLC....