Gstreamer doubts

[Dušan Poizl]

Dňa 11.08.2014 o 14:27 007GK napísal(a):
>
> Hi,
>
>
> I was trying gstreamer with various plugin/elements and could not
> understand few basic terms.
>
> 1. When to use sync=false, sync=true, sync=1 with sink elements?
>
> 2. When to use autovideosink?
>
> 3. Which is the demuxer to be used with decklinksrc?
>
decklinksrc output raw video/audio streams so no demuxes are needed.
>
> 4. What is ffmpegcolorspace element?
>
it convert video frames from one color space or format to another. in
this case from UYVU to I420
>
> 5. For below pipeline gst-launch errors out saying : WARNING:
> erroneous pipeline: could not link queue0 to audioconvert0
>
> gst-launch \
>
> decklinksrc mode=18 connection=composite name=demux \
>
> demux. ! queue ! audioconvert ! audiorate ! vorbisenc ! mux. \
>
> demux. ! queue ! ffmpegcolorspace ! 'video/x-raw-yuv' ! vp8enc speed=7
> ! mux. \
>
> webmmux name=mux ! filesink location=s.webm
>
>
> but below command works:
>
> gst-launch \
>
> decklinksrc mode=18 connection=composite name=demux \
>
> demux. ! queue ! ffmpegcolorspace ! 'video/x-raw-yuv' ! vp8enc speed=7
> ! mux. \
>
> demux. ! queue ! audioconvert ! audiorate ! vorbisenc ! mux. \
>
> webmmux name=mux ! filesink location=newfile.webm
>
>
> I have just swapped video/audio components..
>
it may be bug in gstreamer. I recomend upgrade to gstreamer 1.4 as old
0.10 is not maintained.
>
>
> Thanks,
>
> Sneha
>
>
>
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