2021년 시작해서 2022년 이후로는 수정이 없는 프로젝트
그래도 보면서 할 수 있으면 괜찮아 보이는데, 한번 설치해서 해봐야겠다
[링크 : https://github.com/patrickelectric/GstPipelineStudio?tab=readme-ov-file]
[링크 : https://blogs.igalia.com/scerveau/introducing-gstpipelinestudio-0-3-4/]
| gstreamer 기초 (0) | 2025.08.27 |
|---|---|
| gstreamer pipeline (0) | 2025.08.22 |
| gstreamer tee 예제 (0) | 2025.08.21 |
| gstreamer capsfilter (0) | 2025.08.21 |
| gstreamer parse_launch (0) | 2024.01.11 |
element는 gst-inspector로 확인하는 개별 기능(?)
pads는 대개 source, sink로 표현되는 입출력
bins는 모르겠고.. pipeline은 element(요소)들을 pads를 통해 데이터를 흐르도록 하는 연결의 모임 으로 보면 될 듯
| element | An element is the most important class of objects in GStreamer |
| pads | Pads are an element's input and output, where you can connect other elements |
| bins | A bin is a container for a collection of elements. |
| pipeline | A pipeline is a top-level bin. |
엘리먼트는 크게 세가지로 나누어 지는데
source만 있는 source element(v4l2src 등)
source와 sink가 있는 filter element, demuxer
sink만 있는 sink element(waylandsink, autoviedeosink 등) 이 있다.
또한 name 을 이용해서 named element로 사용할 수 있다.
| source element | Source elements generate data for use by a pipeline, for example reading from disk or from a sound card. |  |
| Filters, convertors, demuxers, muxers and codecs | Filters and filter-like elements have both input and outputs pads. |   |
| Sink elements | Sink elements are end points in a media pipeline. |  |
element에는 properties가 존재하는데
일부는 설정용도로 쓸 수 있고, 일부는 상태정보를 폴링(polling)으로 읽어갈 수 있다.
| $ gst-inspect-1.0 autovideosink Factory Details: Rank none (0) Long-name Auto video sink Klass Sink/Video Description Wrapper video sink for automatically detected video sink Author Jan Schmidt <thaytan@noraisin.net> Plugin Details: Name autodetect Description Plugin contains auto-detection plugins for video/audio in- and outputs Filename /usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstautodetect.so Version 1.20.3 License LGPL Source module gst-plugins-good Source release date 2022-06-15 Binary package GStreamer Good Plugins (Ubuntu) Origin URL https://launchpad.net/distros/ubuntu/+source/gst-plugins-good1.0 GObject +----GInitiallyUnowned +----GstObject +----GstElement +----GstBin +----GstAutoDetect +----GstAutoVideoSink Implemented Interfaces: GstChildProxy Pad Templates: SINK template: 'sink' Availability: Always Capabilities: ANY Element has no clocking capabilities. Element has no URI handling capabilities. Pads: SINK: 'sink' Element Properties: async-handling : The bin will handle Asynchronous state changes flags: readable, writable Boolean. Default: false filter-caps : Filter sink candidates using these caps. flags: readable, writable, 0x2000 video/x-raw message-forward : Forwards all children messages flags: readable, writable Boolean. Default: false name : The name of the object flags: readable, writable, 0x2000 String. Default: "autovideosink0" parent : The parent of the object flags: readable, writable, 0x2000 Object of type "GstObject" sync : Sync on the clock flags: readable, writable Boolean. Default: true ts-offset : Timestamp offset in nanoseconds flags: readable, writable Integer64. Range: -9223372036854775808 - 9223372036854775807 Default: 0 |
| Properties and values Properties are used to describe extra information for capabilities. A property consists of a key (a string) and a value. |
주기적으로 읽는게 싫다면 signal을 제공하는 엘리먼트를 통해 이벤트 발생시 값을 수신할 수 있다.
| $ gst-inspect-1.0 fpsdisplaysink Factory Details: Rank none (0) Long-name Measure and show framerate on videosink Klass Sink/Video Description Shows the current frame-rate and drop-rate of the videosink as overlay or text on stdout Author Zeeshan Ali <zeeshan.ali@nokia.com>, Stefan Kost <stefan.kost@nokia.com> Plugin Details: Name debugutilsbad Description Collection of elements that may or may not be useful for debugging Filename /usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstdebugutilsbad.so Version 1.20.3 License LGPL Source module gst-plugins-bad Source release date 2022-06-15 Binary package GStreamer Bad Plugins (Ubuntu) Origin URL https://launchpad.net/distros/ubuntu/+source/gst-plugins-bad1.0 GObject +----GInitiallyUnowned +----GstObject +----GstElement +----GstBin +----GstFPSDisplaySink Implemented Interfaces: GstChildProxy Pad Templates: SINK template: 'sink' Availability: Always Capabilities: ANY Element has no clocking capabilities. Element has no URI handling capabilities. Pads: SINK: 'sink' Element Properties: async-handling : The bin will handle Asynchronous state changes flags: readable, writable Boolean. Default: false fps-update-interval : Time between consecutive frames per second measures and update (in ms). Should be set on NULL state flags: readable, writable Integer. Range: 1 - 2147483647 Default: 500 frames-dropped : Number of frames dropped by the sink flags: readable Unsigned Integer. Range: 0 - 4294967295 Default: 0 frames-rendered : Number of frames rendered flags: readable Unsigned Integer. Range: 0 - 4294967295 Default: 0 last-message : The message describing current status flags: readable String. Default: null max-fps : Maximum fps rate measured. Reset when going from NULL to READY.-1 means no measurement has yet been done flags: readable Double. Range: -1 - 1.797693e+308 Default: -1 message-forward : Forwards all children messages flags: readable, writable Boolean. Default: false min-fps : Minimum fps rate measured. Reset when going from NULL to READY.-1 means no measurement has yet been done flags: readable Double. Range: -1 - 1.797693e+308 Default: -1 name : The name of the object flags: readable, writable, 0x2000 String. Default: "fpsdisplaysink0" parent : The parent of the object flags: readable, writable, 0x2000 Object of type "GstObject" signal-fps-measurements: If the fps-measurements signal should be emitted. flags: readable, writable Boolean. Default: false silent : Don't produce last_message events flags: readable, writable Boolean. Default: false sync : Sync on the clock (if the internally used sink doesn't have this property it will be ignored flags: readable, writable Boolean. Default: true text-overlay : Whether to use text-overlay flags: readable, writable Boolean. Default: true video-sink : Video sink to use (Must only be called on NULL state) flags: readable, writable Object of type "GstElement" Element Signals: "fps-measurements" : void user_function (GstElement* object, gdouble arg0, gdouble arg1, gdouble arg2, gpointer user_data); |
| Signals GObject signals can be used to notify applications of events specific to this object. Note, however, that the application needs to be aware of signals and their meaning, so if you're looking for a generic way for application-element interaction, signals are probably not what you're looking for. In many cases, however, signals can be very useful. See the GObject documentation for all internals about signals. |
[링크 : https://gstreamer.freedesktop.org/documentation/plugin-development/basics/signals.html?gi-language=c]
bin - pipeline의 하위라는데 알아서 해주는게 포인트라고 보면되나?
| $ gst-inspect-1.0 | grep bin camerabin: camerabin: Camera Bin camerabin: viewfinderbin: Viewfinder Bin camerabin: wrappercamerabinsrc: Wrapper camera src element for camerabin2 closedcaption: cccombiner: Closed Caption Combiner cluttergst3: clutterautovideosink: Generic bin codecalpha: alphacombine: Alpha Combiner codecalpha: vp8alphadecodebin: VP8 Alpha Decoder codecalpha: vp9alphadecodebin: VP9 Alpha Decoder debugutilsbad: testsrcbin: Generic bin dvb: dvbbasebin: DVB bin encoding: encodebin: Encoder Bin encoding: encodebin2: Encoder Bin libav: avdec_binkaudio_dct: libav Bink Audio (DCT) decoder libav: avdec_binkaudio_rdft: libav Bink Audio (RDFT) decoder libav: avdec_binkvideo: libav Bink video decoder libav: avdec_bintext: libav Binary text decoder libav: avdec_xbin: libav eXtended BINary text decoder opengl: glfilterbin: GL Filter Bin opengl: glmixerbin: OpenGL video_mixer empty bin opengl: glsinkbin: GL Sink Bin opengl: glsrcbin: GL Src Bin opengl: glstereomix: OpenGL stereo video combiner opengl: glvideomixer: OpenGL video_mixer bin playback: decodebin: Decoder Bin playback: decodebin3: Decoder Bin 3 playback: parsebin: Parse Bin playback: playbin: Player Bin 2 playback: playbin3: Player Bin 3 playback: uridecodebin: URI Decoder playback: uridecodebin3: URI Decoder playback: urisourcebin: URI reader resindvd: rsndvdbin: rsndvdbin rist: roundrobin: Round Robin rtpmanager: rtpbin: RTP Bin staticelements: bin: Generic bin switchbin: switchbin: switchbin transcode: transcodebin: Transcode Bin transcode: uritranscodebin: URITranscode Bin vaapi: vaapidecodebin: VA-API Decode Bin webrtc: webrtcbin: WebRTC Bin |
| Play a media file using playbin (as in Basic tutorial 1: Hello world!): gst-launch-1.0 playbin uri=https://gstreamer.freedesktop.org/data/media/sintel_trailer-480p.webm A fully operation playback pipeline, with audio and video (more or less the same pipeline that playbin will create internally): gst-launch-1.0 souphttpsrc location=https://gstreamer.freedesktop.org/data/media/sintel_trailer-480p.webm ! matroskademux name=d ! queue ! vp8dec ! videoconvert ! autovideosink d. ! queue ! vorbisdec ! audioconvert ! audioresample ! autoaudiosink |
[링크 : https://gstreamer.freedesktop.org/documentation/tutorials/basic/hello-world.html?gi-language=c]
[링크 : https://gstreamer.freedesktop.org/documentation/tutorials/basic/gstreamer-tools.html?gi-language=c]
[링크 : http://ttps://medium.com/may-i-lab/gstreamer-gstreamer-기초-da5015f531fc]
| gstpipelinestudio (0) | 2025.09.11 |
|---|---|
| gstreamer pipeline (0) | 2025.08.22 |
| gstreamer tee 예제 (0) | 2025.08.21 |
| gstreamer capsfilter (0) | 2025.08.21 |
| gstreamer parse_launch (0) | 2024.01.11 |
nxp의 selfie_segmenter.py 에서 추출한 파이프라인
원래 나온거랑은 약간의 줄 추가가 있을 뿐 순서는 차이가 없음
특이(?)하게도 v4lsrc가 가장 처음에 시작하는게 아니라
imxpositor_g2d 라고 입력받은걸 양쪽으로 출력하는 비디오 믹서가 파이프라인의 시작에 존재한다.
|
imxcompositor_g2d latency=33333333 min-upstream-latency=33333333 name=comp sink_1::ypos=0 sink_0::ypos=0 sink_0::xpos=480 \
! cairooverlay name=cairo_text \
! fpsdisplaysink name=wayland_sink text-overlay=false video-sink=waylandsink \
v4l2src device=/dev/video3 \
! video/x-raw,width=640,height=480,framerate=30/1 \
! aspectratiocrop aspect-ratio=1/1 \
! imxvideoconvert_g2d rotation=horizontal-flip \
! video/x-raw,width=480,height=480 \
! tee name=t \
t. ! queue max-size-buffers=1 leaky=2 \
! imxvideoconvert_g2d \
! video/x-raw,width=256,height=256 \
! videoconvert \
! video/x-raw,format=RGB \
! tensor_converter \
! tensor_transform mode=arithmetic option=typecast:float32,div:255.0 \
! tensor_filter framework=tensorflow-lite model=/opt/gopoint-apps/downloads/selfie_segmenter_int8.tflite accelerator=true:npu custom=Delegate:External,ExtDelegateLib:libvx_delegate.so name=tensor_filter latency=1 \
! tensor_decoder mode=image_segment option1=snpe-depth option2=0 \
! imxvideoconvert_g2d \
! video/x-raw,width=480,height=480,format=RGBA \
! comp.sink_0 \
t. ! queue max-size-buffers=1 leaky=2 \
! comp.sink_1
|
자리를 조금 움직여서 보기 편하게(?) 만들면 아래와 같이
v4lsrc로 시작해서 fpsdisplaysink 로 끝내는 순차적인 구성으로 변경이 가능하다.
|
v4l2src device=/dev/video3 \
! video/x-raw,width=640,height=480,framerate=30/1 \
! aspectratiocrop aspect-ratio=1/1 \
! imxvideoconvert_g2d rotation=horizontal-flip \
! video/x-raw,width=480,height=480 \
! tee name=t \
t. ! queue max-size-buffers=1 leaky=2 \
! imxvideoconvert_g2d \
! video/x-raw,width=256,height=256 \
! videoconvert \
! video/x-raw,format=RGB \
! tensor_converter \
! tensor_transform mode=arithmetic option=typecast:float32,div:255.0 \
! tensor_filter framework=tensorflow-lite model=/opt/gopoint-apps/downloads/selfie_segmenter_int8.tflite accelerator=true:npu custom=Delegate:External,ExtDelegateLib:libvx_delegate.so name=tensor_filter latency=1 \
! tensor_decoder mode=image_segment option1=snpe-depth option2=0 \
! imxvideoconvert_g2d \
! video/x-raw,width=480,height=480,format=RGBA \
! imxcompositor_g2d latency=33333333 min-upstream-latency=33333333 name=comp sink_1::ypos=0 sink_0::ypos=0 sink_0::xpos=480 \
! cairooverlay name=cairo_text \
! fpsdisplaysink name=wayland_sink text-overlay=false video-sink=waylandsink \
t. ! queue max-size-buffers=1 leaky=2 \
! comp.sink_1
|
tee 로 나눈걸 다시 명시적으로 하는걸 생략하면 아래처럼도 변형가능하다.
|
v4l2src device=/dev/video3 \
! video/x-raw,width=640,height=480,framerate=30/1 \
! aspectratiocrop aspect-ratio=1/1 \
! imxvideoconvert_g2d rotation=horizontal-flip \
! video/x-raw,width=480,height=480 \
! tee name=t \
! queue max-size-buffers=1 leaky=2 \
! imxvideoconvert_g2d \
! video/x-raw,width=256,height=256 \
! videoconvert \
! video/x-raw,format=RGB \
! tensor_converter \
! tensor_transform mode=arithmetic option=typecast:float32,div:255.0 \
! tensor_filter framework=tensorflow-lite model=/opt/gopoint-apps/downloads/selfie_segmenter_int8.tflite accelerator=true:npu custom=Delegate:External,ExtDelegateLib:libvx_delegate.so name=tensor_filter latency=1 \
! tensor_decoder mode=image_segment option1=snpe-depth option2=0 \
! imxvideoconvert_g2d \
! video/x-raw,width=480,height=480,format=RGBA \
! imxcompositor_g2d latency=33333333 min-upstream-latency=33333333 name=comp sink_1::ypos=0 sink_0::ypos=0 sink_0::xpos=480 \
! cairooverlay name=cairo_text \
! fpsdisplaysink name=wayland_sink text-overlay=false video-sink=waylandsink \
t. \
! queue max-size-buffers=1 leaky=2 \
! comp.sink_1
|
| gstpipelinestudio (0) | 2025.09.11 |
|---|---|
| gstreamer 기초 (0) | 2025.08.27 |
| gstreamer tee 예제 (0) | 2025.08.21 |
| gstreamer capsfilter (0) | 2025.08.21 |
| gstreamer parse_launch (0) | 2024.01.11 |
gemini를 찬양하라(?)
| # Example with avenc_aac gst-launch-1.0 -e \ filesrc location=video1.mp4 ! decodebin name=demux1 \ filesrc location=video2.mp4 ! decodebin name=demux2 \ demux1. ! queue ! videoconvert ! x264enc ! tee name=vtee1 \ demux1. ! queue ! audioconvert ! audioresample ! avenc_aac ! tee name=atee1 \ demux2. ! queue ! videoconvert ! x264enc ! tee name=vtee2 \ demux2. ! queue ! audioconvert ! audioresample ! avenc_aac ! tee name=atee2 \ vtee1. ! queue ! mp4mux name=mux1 ! filesink location=output1.mp4 \ vtee2. ! queue ! mp4mux name=mux2 ! filesink location=output2.mp4 \ atee2. ! queue ! mux1.audio_0 \ atee1. ! queue ! mux2.audio_0 |
name. 으로 해서 이전것에서 새끼(?)치면 되나보다.
굳이 그리자면 이런식으로 나오는 듯.
2021.02.08 - [프로그램 사용/gstreamer] - gstreamer tee
| gstreamer 기초 (0) | 2025.08.27 |
|---|---|
| gstreamer pipeline (0) | 2025.08.22 |
| gstreamer capsfilter (0) | 2025.08.21 |
| gstreamer parse_launch (0) | 2024.01.11 |
| nnstreamer (0) | 2023.12.20 |
gstreamer 파이프라인 예제를 보다가 이상한걸 발견
video/x-raw가 엘리먼트 이름은 아닐텐데..하고 gpt에 물어보니 capsfilter 라고 해서 찾아보니
| gst-launch-1.0 -v v4l2src ! videorate ! video/x-raw,framerate=25/2 ! theoraenc ! oggmux ! filesink location=recording.ogg |
[링크 : https://gstreamer.freedesktop.org/documentation/videorate/?gi-language=c]
"capsfilter caps=" 생략하고 쓰면 알아서 capsfilter로 인식하는 건가?
| Example launch line gst-launch-1.0 videotestsrc ! capsfilter caps=video/x-raw,format=GRAY8 ! videoconvert ! autovideosink Limits acceptable video from videotestsrc to be grayscale. Equivalent to gst-launch-1.0 videotestsrc ! video/x-raw,format=GRAY8 ! videoconvert ! autovideosink |
[링크 : https://gstreamer.freedesktop.org/documentation/coreelements/capsfilter.html?gi-language=c]
| gstreamer pipeline (0) | 2025.08.22 |
|---|---|
| gstreamer tee 예제 (0) | 2025.08.21 |
| gstreamer parse_launch (0) | 2024.01.11 |
| nnstreamer (0) | 2023.12.20 |
| gst-device-monitor-1.0 (0) | 2023.12.06 |
nnstreamer python 예제를 보다보니, 아래와 같이 pipeline 문자열을 이용해서 구성하고
이름으로 싱크를 찾아 콜백을 연결해 주는걸 보니, 일일이 element 생성해서 연결할 필요가 없을 것 같아서 검색중
| gst_launch_cmdline += "tensor_sink name=tensor_sink t. ! " self.pipeline = Gst.parse_launch(gst_launch_cmdline) # bus and message callback bus = self.pipeline.get_bus() bus.add_signal_watch() bus.connect("message", self.on_bus_message) self.tensor_filter = self.pipeline.get_by_name("tensor_filter") self.wayland_sink = self.pipeline.get_by_name("img_tensor") # tensor sink signal : new data callback tensor_sink = self.pipeline.get_by_name("tensor_sink") tensor_sink.connect("new-data", self.new_data_cb) # @brief Callback for tensor sink signal. def new_data_cb(self, sink, buffer): """Callback for tensor sink signal. :param sink: tensor sink element :param buffer: buffer from element :return: None """ |
parse쪽은 c 로는 아래의 함수를 쓰면 될 것 같은데
| gst_parse_launch GstElement * gst_parse_launch (const gchar * pipeline_description, GError ** error) Create a new pipeline based on command line syntax. Please note that you might get a return value that is not NULL even though the error is set. In this case there was a recoverable parsing error and you can try to play the pipeline. To create a sub-pipeline (bin) for embedding into an existing pipeline use gst_parse_bin_from_description. Parameters: pipeline_description – the command line describing the pipeline error – the error message in case of an erroneous pipeline. Returns ( [transfer: floating]) – a new element on success, NULL on failure. If more than one toplevel element is specified by the pipeline_description, all elements are put into a GstPipeline, which than is returned. |
[링크 : https://gstreamer.freedesktop.org/documentation/gstreamer/gstparse.html?gi-language=c]
아래의 함수를 이용해서 찾으면 될...지도?
| GObject ╰──GInitiallyUnowned ╰──GstObject ╰──GstElement ╰──GstBin ╰──GstPipeline gst_bin_get_by_name GstElement * gst_bin_get_by_name (GstBin * bin, const gchar * name) Gets the element with the given name from a bin. This function recurses into child bins. Parameters: bin – a GstBin name – the element name to search for Returns ( [transfer: full][nullable]) – the GstElement with the given name |
| gstreamer tee 예제 (0) | 2025.08.21 |
|---|---|
| gstreamer capsfilter (0) | 2025.08.21 |
| nnstreamer (0) | 2023.12.20 |
| gst-device-monitor-1.0 (0) | 2023.12.06 |
| gstremaer videobox + videomixer (0) | 2023.04.10 |
Neural Network gstreamer인가?
| NNStreamer provides a set of GStreamer plugins so developers may apply neural networks, attach related frameworks (including ROS, IIO, FlatBuffers, and Protocol Buffers), and manipulate tensor data streams in GStreamer pipelines easily and execute such pipelines efficiently |
| gstreamer capsfilter (0) | 2025.08.21 |
|---|---|
| gstreamer parse_launch (0) | 2024.01.11 |
| gst-device-monitor-1.0 (0) | 2023.12.06 |
| gstremaer videobox + videomixer (0) | 2023.04.10 |
| gst-inspector.c (0) | 2023.04.06 |
v4l2src 관련해서 기존에 웹캠에서 지원하는 모드들 찾는다고 고생했는데 간단한 유틸리티를 알게 됨 -_-
| $ man gst-device-monitor-1.0 SYNOPSIS gst-device-monitor-1.0 [DEVICE_CLASSES[:FILTER_CAPS]] [DEVICE_CLASSES[:FILTER_CAPS]] |
| $ gst-device-monitor-1.0 Video/Source Probing devices... Device found: name : 720p HD Camera class : Video/Source caps : image/jpeg, width=1280, height=720, framerate=30/1 image/jpeg, width=640, height=480, framerate=30/1 image/jpeg, width=640, height=360, framerate=30/1 image/jpeg, width=352, height=288, framerate=30/1 image/jpeg, width=320, height=240, framerate=30/1 image/jpeg, width=160, height=120, framerate=30/1 video/x-raw, format=YUY2, width=1280, height=720, framerate=10/1 video/x-raw, format=YUY2, width=640, height=480, framerate=30/1 video/x-raw, format=YUY2, width=640, height=360, framerate=30/1 video/x-raw, format=YUY2, width=352, height=288, framerate=30/1 video/x-raw, format=YUY2, width=320, height=240, framerate=30/1 video/x-raw, format=YUY2, width=160, height=120, framerate=30/1 properties: object.path = v4l2:/dev/video0 device.api = v4l2 media.class = Video/Source device.product.id = 308 device.vendor.id = 11134 api.v4l2.path = /dev/video0 api.v4l2.cap.driver = uvcvideo api.v4l2.cap.card = "720p\ HD\ Camera:\ 720p\ HD\ Camera" api.v4l2.cap.bus_info = usb-0000:00:14.0-6 api.v4l2.cap.version = 6.2.16 api.v4l2.cap.capabilities = 84a00001 api.v4l2.cap.device-caps = 04200001 device.id = 33 node.name = v4l2_input.pci-0000_00_14.0-usb-0_6_1.0 node.description = "720p\ HD\ Camera" factory.name = api.v4l2.source node.pause-on-idle = false factory.id = 10 client.id = 32 clock.quantum-limit = 8192 media.role = Camera node.driver = true object.id = 35 object.serial = 35 gst-launch-1.0 pipewiresrc path=35 ! ... |
| gstreamer parse_launch (0) | 2024.01.11 |
|---|---|
| nnstreamer (0) | 2023.12.20 |
| gstremaer videobox + videomixer (0) | 2023.04.10 |
| gst-inspector.c (0) | 2023.04.06 |
| gstreamer videomixer 반쪽 성공 (0) | 2023.03.27 |
videobox를 이용해서 어느정도는 원하는 위치로 옮길순 있는데 자유자재로 옮기긴 힘든 듯?
| gst-launch-1.0 \ videotestsrc pattern=1 ! \ video/x-raw,format=AYUV,framerate=\(fraction\)10/1,width=100,height=100 ! \ videobox border-alpha=0 top=-70 bottom=-70 right=-220 ! \ videomixer name=mix sink_0::alpha=0.7 sink_1::alpha=0.5 ! \ videoconvert ! xvimagesink \ videotestsrc ! \ video/x-raw,format=AYUV,framerate=\(fraction\)5/1,width=320,height=240 ! mix. |
[링크 : https://gstreamer.freedesktop.org/documentation/videomixer/index.html?gi-language=c]
| bottom “bottom” gint Pixels to box at bottom (<0 = add a border) Flags : Read / Write Default value : 0 left “left” gint Pixels to box at left (<0 = add a border) Flags : Read / Write Default value : 0 right “right” gint Pixels to box at right (<0 = add a border) Flags : Read / Write Default value : 0 top “top” gint Pixels to box at top (<0 = add a border) Flags : Read / Write Default value : 0 |
[링크 : https://gstreamer.freedesktop.org/documentation/videobox/index.html?gi-language=c]
ximagesink 에다가 sync=false 하니 프레임이 잘 나온다.
videomixer가 더 앞에 있으니 videomixer에 sync=false를 넣어야 할 줄 알았는데 의외네
| $ gst-launch-1.0 v4l2src device=/dev/video2 ! jpegdec ! videomixer name=mix ! videoconvert ! ximagesink sync=false v4l2src device=/dev/video0 ! jpegdec ! mix. |
[링크 : https://stackoverflow.com/questions/38392956/gstreamer-videomixer-very-low-framerate]
| $ gst-launch-1.0 \ v4l2src device=/dev/video2 ! jpegdec ! \ videobox top=0 bottom=0 left=-960 ! \ videomixer name=mix sink_0::alpha=1 sink_1::alpha=1 ! \ videoconvert ! \ ximagesink window-width=1920 window-height=1080 sync=false \ v4l2src device=/dev/video0 ! jpegdec ! \ videobox top=0 bottom=0 ! mix. |
| nnstreamer (0) | 2023.12.20 |
|---|---|
| gst-device-monitor-1.0 (0) | 2023.12.06 |
| gst-inspector.c (0) | 2023.04.06 |
| gstreamer videomixer 반쪽 성공 (0) | 2023.03.27 |
| gstreamer videomixer ... 2? (0) | 2023.03.27 |
한번 빌드해서 원하는 결과만 덤프하는 용도로 수정이 가능하려나?
[링크 : https://github.com/GStreamer/gstreamer/blob/main/subprojects/gstreamer/tools/gst-inspect.c]
gst-inspect 에서 원하는 정보는 아래의 Pad template 부분
| Pad Templates: SINK template: 'sink_%u' Availability: On request Capabilities: video/x-raw format: { (string)AYUV, (string)BGRA, (string)ARGB, (string)RGBA, (string)ABGR, (string)Y444, (string)Y42B, (string)YUY2, (string)UYVY, (string)YVYU, (string)I420, (string)YV12, (string)NV12, (string)NV21, (string)Y41B, (string)RGB, (string)BGR, (string)xRGB, (string)xBGR, (string)RGBx, (string)BGRx } width: [ 1, 2147483647 ] height: [ 1, 2147483647 ] framerate: [ 0/1, 2147483647/1 ] SRC template: 'src' Availability: Always Capabilities: video/x-raw format: { (string)AYUV, (string)BGRA, (string)ARGB, (string)RGBA, (string)ABGR, (string)Y444, (string)Y42B, (string)YUY2, (string)UYVY, (string)YVYU, (string)I420, (string)YV12, (string)NV12, (string)NV21, (string)Y41B, (string)RGB, (string)BGR, (string)xRGB, (string)xBGR, (string)RGBx, (string)BGRx } width: [ 1, 2147483647 ] height: [ 1, 2147483647 ] framerate: [ 0/1, 2147483647/1 ] Element has no clocking capabilities. Element has no URI handling capabilities. |
Pad Templates를 출력하는 함수
| static void print_pad_templates_info (GstElement * element, GstElementFactory * factory) |
[링크 : https://github.com/GStreamer/gstreamer/blob/main/subprojects/gstreamer/tools/gst-inspect.c#L816]
Capabilities 부분을 출력하는 함수
| static void print_caps (const GstCaps * caps, const gchar * pfx) |
[링크 : https://github.com/GStreamer/gstreamer/blob/main/subprojects/gstreamer/tools/gst-inspect.c#L194]
| gst-device-monitor-1.0 (0) | 2023.12.06 |
|---|---|
| gstremaer videobox + videomixer (0) | 2023.04.10 |
| gstreamer videomixer 반쪽 성공 (0) | 2023.03.27 |
| gstreamer videomixer ... 2? (0) | 2023.03.27 |
| gstreamer pad - sink 와 src (0) | 2023.03.27 |
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