Hello Steve, I think the best way would be not use a system clock but rather have an internal clock of your src element, which can use values from driver. Hope this will help ? Regards Kapil On Thu, Mar 24, 2011 at 2:33 AM, Steve Roskowski <rosko at thirdiris.com>wrote: > I am building a gstreamer camera source. It sits directly on top of > the raw hardware and takes advantage of various system oddities. It > generates 3 srcs - an encoded video stream, a occasional high > resolution snapshot (based on request), and a low resolution preview > data stream. I want all of them tagged with real-time timestamps > (that is the actual day/date/time from the system), but accurate to > the fractional second of the frame generation. > > I cannot figure out the approved way to do this. The implementations > I have found, (v4l2 for example), simply use the system clock and > attach a timestamp as the buffer is generated at the user level. This > fails badly in a loaded embedded device - the variance in thread > servicing shows up in the timestamping, resulting in jerky video. > > I have accurate timestamps attached to the buffers coming up from the > drivers. How can I take advantage of this? The simplistic answer of > directly converting this into timestamps on each buffer works fine for > a single src, but with multiple src-s the pipeline fails to get out of > pre-roll. > > I am based on top of base_src which is driving the video stream src, > and sample queues for each of the lower speed sources in the create > function, pushing buffers if they are there. > > any help would be appreciated... > -- > Steve > _______________________________________________ > gstreamer-embedded mailing list > gstreamer-embedded at lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/gstreamer-embedded > -- www.mediamagictechnologies.com (Gstreamer, ffmpeg, Red5, Streaming) twitter handle: @gst_kaps http://www.linkedin.com/in/kapilagrawal -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.freedesktop.org/archives/gstreamer-embedded/attachments/20110324/04981cbd/attachment.htm>
