Use of capsfilter
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Hi , I am really confused about the use of capsfilter in a pipeline. I understand it is for setting some properties.
gst-launch filesrc location=sample.ac3 ! ac3parse ! myaudio ---> will work. gst-launch filesrc location=sample.mp4! ac3parse ! myaudio ---> will give error saying "Failed to parse stream" gst-launch filesrc location=sample.mp4! capsfilter caps="audio/x-ac3" ! ac3parse ! myaudio ---> (Using caps filter) will give me same error itself Anyways the pipeline wont allow us to set unmatched properties to next element right.? Then what is the specific use of capsfilter? |
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You should use caps on media stream. Filesrc well give you raw file bytes. For mp4 use qtdemux. ... filesrc ... ! qtdemux name=demux demux.audio_00 ! capsfilter ... ! ...sink Some thing like this. 29-11-2012 07:00, "deepthips" <[hidden email]> napisał(a):
Hi , I am really confused about the use of capsfilter in a pipeline. I _______________________________________________ gstreamer-devel mailing list [hidden email] http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
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In reply to this post by deeps8us
To add to above question, the following difference in caps tried in gst-launch makes no difference in my video output. where qtdemux have following caps:
SINK template: 'sink' Availability: Always Capabilities: video/quicktime video/mj2 audio/x-m4a application/x-3gp gst-launch filesrc location=IceAge.mp4 ! capsfilter caps="video/mj2,format=(fourcc)AYUV" ! qtdemux name=myqtdemux myqtdemux.! queue ! myvideo ! mydisplaysink myqtdemux.! queue ! myaudio gst-launch filesrc location=IceAge.mp4 ! capsfilter caps="video/quicktime,format=GRAY8" ! qtdemux name=myqtdemux myqtdemux.! queue ! myvideo ! mydisplaysink myqtdemux.! queue ! myaudio gst-launch filesrc location=IceAge.mp4 ! capsfilter caps="video/quicktime,width=320,height=240" ! qtdemux name=myqtdemux myqtdemux.! queue ! myvideo ! mydisplaysink myqtdemux.! queue ! myaudio gst-launch filesrc location=IceAge.mp4 ! capsfilter caps="video/quicktime,width=320,height=240" ! qtdemux name=myqtdemux myqtdemux.! queue ! myvideo ! mydisplaysink myqtdemux.! queue ! myaudio |
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Capsfilter after qtdemux. 29-11-2012 08:27, "deepthips" <[hidden email]> napisał(a):
To add to above question, the following difference in caps tried in _______________________________________________ gstreamer-devel mailing list [hidden email] http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
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Thanks for the reply.. I changed capsfilter to be after qtdemux. But that also didnt show any change. Tried with a video pipeline without audio.
gst-launch filesrc location=IceAge.mp4 ! qtdemux name=myqtdemux ! myvideo ! capsfilter caps="video/x-fake-yuv,width=320,height=240" ! mydisplaysink ------- I expected video to show different resolution AND gst-launch filesrc location=IceAge.mp4 ! qtdemux name=myqtdemux ! myvideo ! capsfilter caps="video/x-fake-yuv,blue_mask=(int)0xFFFFF000" ! mydisplaysink ---------------- I expected screen to be blue color Video played normally. gst-inspect mydisplaysink: Pad Templates: SINK template: 'sink' Availability: Always Capabilities: video/x-fake-yuv video/x-raw-rgb bpp: 32 depth: 32 red_mask: 65280 green_mask: 16711680 blue_mask: -16777216 endianness: 4321 width: [ 1, 1280 ] height: [ 1, 720 ] framerate: [ 0/1, 100/1 ] video/x-raw-rgb bpp: 32 depth: 32 red_mask: -16777216 green_mask: 16711680 blue_mask: 65280 endianness: 4321 width: [ 1, 1280 ] height: [ 1, 720 ] framerate: [ 0/1, 100/1 ] |
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Even on setting width and height to capsfilter, it is setting default values itself.
gst-launch -v filesrc location=sample.mp4 ! qtdemux name=myqtdemux ! myvideo ! capsfilter caps="video/x-fake-yuv,width=200,height=150" ! mydisplaysink GstPad:src: caps = video/x-fake-yuv, width=(int)1024, height=(int)576, video-fd=(int)6, framerate=(fraction)2997/125 |
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In reply to this post by deeps8us
On Thu, 2012-11-29 at 00:39 -0800, deepthips wrote:
Hi, > Thanks for the reply.. I changed capsfilter to be after qtdemux. But that > also didnt show any change. Tried with a video pipeline without audio. > > gst-launch filesrc location=IceAge.mp4 ! qtdemux name=myqtdemux ! myvideo ! > capsfilter caps="video/x-fake-yuv,width=320,height=240" ! mydisplaysink > ------- I expected video to show different resolution > > AND > > gst-launch filesrc location=IceAge.mp4 ! qtdemux name=myqtdemux ! myvideo ! > capsfilter caps="video/x-fake-yuv,blue_mask=(int)0xFFFFF000" ! mydisplaysink > ---------------- I expected screen to be blue color What you're doing with capsfilters doesn't really seem to make sense to me. What are you trying to achieve here? Capsfilters are useful in two scenarios: a) You have a stream that does not have caps set on it yet, and want to set caps on it. More often than not you will want to do that using a typefind element instead though, or the source element's "caps" property. (A more exotic variant of this scenario is where you know the caps and want to add an extra field to the caps that's not there yet) b) You have an element whose output does not depend only on its input, and you want to force it to output things in a specific way (exclusively, or optionally/preferably), examples: v4l2src ! video/x-raw-yuv,width=640,height=480;video/x-raw-rgb,width=640,height=480 ! ... ... ! videoconvert ! videoscale ! video/x-raw-rgb,depth=24,bpp=24,width=640,height=480 ! ... ... ! x264enc ! video/x-h264,profile=main,stream-format=byte-stream ! filesink location=foo.h264 Putting a capsfilter behind a video decoder is rarely useful, as usually a decoder has little choice what to output. In that case you will get a not-negotiated flow error. In your first e-mail you were feeding non-AC3 data (qt) to ac3parse, forced AC3 caps on that data, and then seemed surprised that ac3parse errors out telling you that it can't parse that stream. What did you expect to happen there exactly? Cheers -Tim > > Video played normally. > > gst-inspect mydisplaysink: > > Pad Templates: > SINK template: 'sink' > Availability: Always > Capabilities: > video/x-fake-yuv > video/x-raw-rgb > bpp: 32 > depth: 32 > red_mask: 65280 > green_mask: 16711680 > blue_mask: -16777216 > endianness: 4321 > width: [ 1, 1280 ] > height: [ 1, 720 ] > framerate: [ 0/1, 100/1 ] > video/x-raw-rgb > bpp: 32 > depth: 32 > red_mask: -16777216 > green_mask: 16711680 > blue_mask: 65280 > endianness: 4321 > width: [ 1, 1280 ] > height: [ 1, 720 ] > framerate: [ 0/1, 100/1 ] _______________________________________________ gstreamer-devel mailing list [hidden email] http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
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