[gst-devel] muxers, timestamps, sparse and continuous recordings

[Stefan Kost]

hi,

Eric Zhang schrieb:
> Hi, Stefan:
>
>     I think your pipeline is using GstSystemClock because you
> mentioned the source is a live element. If it is, the clock will keep
> increasing even if the pipeline is paused. This makes the timestamp
> noncontinuous. To generate a continuous timestamp, I think you can try
> to use the clock provided by your sink elements. Maybe this is not
> easy because the live element is different with other source elements.

I meant pausing as on the application level. The videosrc ! tee name=t !
queue ! xvimagesink runs continously. It only t. ! queue ! encoder !
muxer ! filesink that get paused.

Stefan

>
> Eric
>
> 2008/9/10 Stefan Kost <ensonic at hora-obscura.de
> <mailto:ensonic at hora-obscura.de>>
>
>     hi,
>
>     i was wondering how muxers should handle timestamps on incoming
>     buffers.
>     Assume an applications that shows video from a camera. When you
>     click a
>     button it records to file, allowing to pause and unpause in
>     between. The
>     recorded file should have a continuous stream. If I don't do any
>     special
>     casing this is not the case.
>
>     1) When I playback the recorded file, I have an initial pause before
>     video start (if I pressed record after two seconds, the video will
>     start
>     after two seconds).
>
>     2) If I pause in between, also in the playback there is a pause.
>
>     Right now I work around with a pad probe that looks at disconts to
>     aggregate a time_stamp_offset and correct all incoming buffers by
>     subtracting that. It works but probably is not the right way. I
>     believe
>     this involves the use of segments, but I am not sure how. Also both
>     behaviors might be valid (having a sparse and having a continuous
>     stream). So the application would somehow be involved to select the
>     desired behavior. Any comments?
>
>
>     Stefan
>
>
>
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