Gstreamer queue leaky example

Gstreamer queue leaky example. However, I noticed that the queue was not working in that situation, as the pipeline was producing a memory leak. Simple data queue. see the Streaming RTP/RTSP: sync/timestamp problems for details. Applications can take advantage of advances in codec and filter technology transparently. When I resume I make a new processing bin, link it in, send a new segment to the sink Oct 23, 2017 · Hi everybody, I have seen that from the last version of Mission Planner 1. It is cumbersome to exemplify this, so no example is given. 04 using the latest gstreamer releases (core/base 0. However, you can check the other available APIs for GStreamer Daemon, which has a very similar syntax. Since GStreamer 1. First, you are not supposed to connect anything to a sink in GStreamer. Which doesn't work for me so I'll stick with ffenc_mpeg4. using different audio codec (mp3) using qtmux|mp4mux. 3. 0 v4l2src device=/dev/video2 ! image/jpeg,width=1280, height=800, framerate=30/1 ! v4l2jpegdec ! queue ! v4l2h264enc extra-controls="controls, Skip to main content Oct 26, 2023 · Newcomers. Learn more about Teams Plugins. 6400. In my example I lost 80 % of input buffers. Queue has many properties that can be set in order to have various behaviors. 1. Apr 5, 2016 · I want to unkink this two queue from pipeline and exchange some element of this queue. drop the oldest buffers, drop the newest buffers, etc. Sep 14, 2023 · I want to use opencv to get the feed from gstreamer pipeline. A brief overview of the pipeline is trying to achieve (Detailed pipeline below, the actual pipeline is very long): The pipeline capture images at 60fps from a stereo camera with a resolution of 2560x960, limit the frame to 8 fps and only decode the mjpeg image format to raw at 8fps Object detection using tee. sh $ python3 detect. gst_pipeline. GStreamer memory buffer usage. x releases should follow. To achieve such a feature it has request sink pads (sink%u) and 'sometimes' src pads (src%u). mux. Oct 19, 2019 · As your topic’s title is more generic, it is also possible to receive stream through tcp with tcpclientsrc: gst-launch-1. Each queue has the following properties: leaky=2 , max-size-buffers=1 and flush-on-eos=1 . This tutorial shows: How to inject external data into a general GStreamer pipeline. For my application I need to switch the positions of the camera streams in the GUI, I acomplish that by changing the udpsink port since Apr 20, 2022 · Someone more skilled may better answer, but I don't think that queue can help a lot with this case. 1 (problem also observed on R32. 0. Jun 2, 2023 · I have an application in c++ code that receives a h264 camera stream from an ethernet camera and decodes and encodes it in h265 to send it to another pc via udpsink. Mar 2, 2022 · The following code get in inputs a list of url and it create a Gstreamer pipeline. multiqueue. On Linux, you should use the GStreamer version installed with your distribution, the tools should be TPS65982: TPS65982 Bin File Type. using leaky property in queue. Also try adding sync=false to your appsink. self. Knowledge of the GObject and GLib libraries is not mandatory, but will make the I should mention that it works with a playbin and SDP file. Part Number: TPS65988 Other Parts Discussed in Thread: TUSB1146 Feb 10, 2023 · RidgeRun Engineering Services; Client Engagement Process; Professional Services and Support Hours; Subscription Model; List of V4L2 Camera Sensor Drivers for Jetson SOCs For simplicity, in this example, we will only link to the audio pad and ignore the video. Reload to refresh your session. You may check these with gst-inspect-1. Unless you call that from the on_new_webcam_sample () callback this shouldn’t really block for a considerable amount of time. GStreamer とは、マルチメディア系の処理をとっても簡単に実現するためのフレームワークです。. 2 the queue logs few messages as below, but forwards buffers to rtp*pay, Description. 0 udpsrc ! Tsparse ! Tsdemux ! Tee1 ! Parsebin ! Tee2 ! Queue ! Rtphpay ! Webrtcbin In this pipeline, the stream is first received from an UDP source. You could, for example, insert the buffering element before a decoder. The leak is on the last instruction shown in this disassembly of g_intern_string: Starting and stopping a pipeline multiple times seems to result in a memory leak. As everybody I started by using the gstreamer cli gst-launch-1. You switched accounts on another tab or window. You signed in with another tab or window. py from the "examples-cameras" and inserted the tracker option. {"payload":{"allShortcutsEnabled":false,"fileTree":{"plugins/elements":{"items":[{"name":"gstcapsfilter. It includes two parts: using gstreamer apis in python and writing gstreamer plugins with python. The applications it supports range from simple Ogg/Vorbis playback, audio/video streaming to complex audio (mixing) and video (non-linear editing) processing. # Simple explanation: # - get audio from some device (webcam or mic) # - its sample rate is 16000 hz # - make 15600-length tensor hopping 3900 samples # - 32768 ~ +32767 -> -1. 公式 And so ends your first tutorial with GStreamer. GStreamer 是一个非常强大和通用的用于开发流媒体应用程序的框架。. The video is the same as the original camera output and the labels and bounding boxes are updated after processing in the tensor filter. Improve headphone listening of stereo audio records using the bs2b library. 'gainrange="2 2" '. Playback tutorial 3: Short-cutting the pipeline explains how to achieve the same goals in a playbin-based pipeline. I got a couple errors that I do not understand but the tracker is working on my dev board mini. The receiving pc runs several pipelines with udpsrc and displays them on the screen in a GUI. Apr 13, 2015 · using extra queue's and putting it before/after elements. filesrc num-buffers. 0 -v tcpclientsrc host=127. But we find same TPS65988: TPS65988DHRSHR bin file generation. Jan 16, 2023 · One solution is to companion the interpipesrc with a queue. The image sensor driver is set up specifically for 5 sensors, and each sensor has been individually verified to provide a solid 30fps at 12MP. Q&A for work. Like that : gst_element_set_state (pipeline, GST_STATE_PAUSED); gst_element_set_state (sink, GST_STATE_NUL Skip to main content tee. network drops out or not enough bandwidth) the queue will run full, at which point it would drop data (new or old) rather than block the upstream data producer and thus the tee and the other branch. The sink is the end of the line and should just receive data. filesrc location. ! queue leaky=1 ! autovideosink sync=false. GScam is a GStreamer-based ROS project with the interface to enable, configure and launch GStreamer pipelines, publishing data from any GStreamer source to a specific ROS topic. Basically, a queue performs two tasks: Data is queued until a selected limit is reached. Jun 12, 2021 · I have a pipeline streaming from webrtc and sent to other webrtc peers with an input-selector and tee. Some users may need to prevent using too much memory. The queue is typically used in conjunction with a thread. State changes are async. ConnorM October 26, 2023, 4:01pm 1. Aug 27, 2021 · In this case, a memory leak is observed. NNStreamer provides gtest based test cases for common library and nnstreamer plugins . A pipeline might stream video from a file to a network, or add an echo to a recording, or (most interesting to us) capture the output of a Video4Linux device. I’ve attached a simple 2 camera example of the setup/pipeline graph. Hope that someone can help me. Mar 13, 2024 · Example of Gstreamer Pipeline with Tee Element. Flags : Read / Write Default value : none (0) Since: 1. GStreamer框架的许多优点都来自于它的模块化：GStreamer可以无缝地合并新的插件模块，但是由于模块化和强大的功能往往以更大的复杂度为代价，开发新的应用程序并不总是简单 "leaky" property of queue plugin or at least reduce this number. When using this property and regardless the values of two other properties "max-size-buffers" and "min-threshold-buffers", there is an important number of buffers that will be dropped. Before operating appsrc, the caps property must be set to Jul 24, 2020 · According to the documentation, sync-by-running-time only refers to syncing between linked and non-linked queues. 2. 16. With GStreamer 1. During 10 hours of application work, memory consumption increased by 400 MB. Split data to multiple pads. Yeah, it’s almost a regular queue, and tyco means it can leak. appsrc can be used by linking with the libgstapp library to access the methods directly or by using the appsrc action signals. The GStreamer ‘queue‘ element has a ‘leaky‘ parameter which allows you to control what happens when the queue is full e. May 31, 2024 · ! queue leaky=1 ! decodebin ! videoconvert ! autovideosink sync=false tips : sync=false : remove dropped frame rate, lag and error message( There may be a timestamping problem, or this computer is too slow ). mp4 -e t. I was able to reproduce the leak on Windows XP 32-bit, Windows 7 64-bit, and Ubuntu 8. Today we have learned: How to initialize GStreamer using gst_init(). A full description of the various debug levels can be found in the GStreamer core library API documentation, in the "Running GStreamer Applications" section. FFmpeg memory leak. 0 videotestsrc ! queue ! autovideosink. c May 7, 2020 · The best approach is to use threads to read frames continuously and assign them on an attribute of a class. 4 in buildroot on a rockchip rk3288. The first one to be hit blocks the buffering. This page presents some GStreamer examples pipelines on supported platforms using the OpenWebRTC (OWR) Demo. c (or find it in your GStreamer installation). 0. Oct 4, 2022 · jaeyun-jung commented on Nov 2, 2022. tips:-e (EOS signal): Pipelines for file saving require a reliable EOS(End of Stream) signal; queue leaky=1 ! autovideosink sync=false: prevent blocking; drop=true: drop frame if cannot read quickly enough Apr 29, 2022 · They all limit the amount of data that can be buffered internally in the queue. Location of the file to read. An example of a memory leak test: Jul 15, 2016 · add drop=true to the appsink. To do this open a terminal and run: gstd Creating the Sources Video RAW Source Jun 9, 2023 · Teams. Memory Leaks while using gstbuffer. This is a simplified example using xray. 0 -e udpsrc port=5600 ! application/x-rtp, clock-rate=90000,payload=96 \. You are generating more state change requests than the pipeline can handle, so most likely your message queue gets build up by those requests. Maintenance of the SSRC participant database. Apr 26, 2011 · GStreamer defines live sources as sources that discard data when paused, and produce data at a fixed rate thus providing a clock to publish this rate. Multithreading queue. The tutorials are currently written only in the C programming language, so you need to be comfortable with it. Limitations GStreamer pipelines cannot simultaneously capture streams using sources that access the same device, hence tcpServer. gst-launch-1. 50, it is possible to stream video directly to the HUD. Number of 4K sized buffers to be read from the input stream. PR #115 for leaky option. The Novacut project has a guide to porting Python applications from the prior 0. 0 API which all v1. For viewing the output have to run following pipeline Feb 7, 2023 · I have an example gstreamer pipeline: gst-launch-1. If you comment out the call of self. I have noticed, when I attempt to use glcolorconvert in a pipeline it leaks. Each queue has the following properties: leaky=2, max-size-buffers=1 and flush-on-eos=1. get_size())), then the memory leak does not occur. A queue that has sink and src pad linked will never discard any buffers. 0 and read the specs for each filter carefully, so you know what type of buffes are flowing through each plugin. Set the number of streams to 64. c","contentType Hi @dshem (Member) @Ranj_92 (Member) , Here is an example of simple gstreamer pipeline for "RTSP stream from USB camera in KV260". May 30, 2019 · A trick to stop GStreamer elements from buffering is adding one buffer queues that discard older buffers (you can also discard newer buffers with leaky upstream): queue max-size-buffers=1 leaky=downstream. Dynamic Hello World. Giving “-1” to this argument will read complete stream. This source pipeline is a videotestsrc that simulates a real camera sensor connected to the system. the queue instance. cd /usr/bin/unittest-nnstreamer/ ssat. Launch OWR Demo. However, when attempting multiple simultaneous camera streams, I am seeing some strange bandwidth limitation with nvarguscamerasrc in Saved searches Use saved searches to filter your results more quickly Feb 9, 2024 · What I observe is that if I add a leaky parameter to queue leaky=downstream max-size-buffers=25 anywhere in the pipeline, it takes more CPU resources, or more time if the CPU resource is limited, for the GStreamer pipeline to process each frame. Install nodejs sudo apt install nodejs 2. GStreamer and ROS can work together to deliver modular and optimized systems using images and audio to make decisions on actions to be performed by the robot. That’s curious. extract_dup(0, buf. Another example is playing music and hooking up a visualisation module. return ('nvarguscamerasrc '. update_frame(buf. 1 a=rtpmap:96 H264/90000 Can be used to play the stream like this: Jan 24, 2024 · ciaxj88 January 25, 2024, 8:32am 5. Apr 26, 2023 · Hello, I am using CUDA backend VPI functions in a main thread which culminates in sending the image to a server using opencv video writer with gstreamer def gstreamer_out(): # leaky downstream throws away old images - default queue is 5 # sync = false might be useful # not tested with real cameras #MUX playback ID https://stream. There is also a queue after the decoder, and it never fill it up, nor it leaks in any settings. Let's use the leaky queue to control memory usage appropriately. Chromium breaks the colors of the video signal. so. capturing a video where the video is shown on the screen and also encoded and written to a file. mp4mux: trying streamable=true, trying faststart=true, trying segmented=2000 This is a collection of all the examples I created in 2020, during my learning phase with GStreamer 1. State. 0 queue and play with. With just 1 stream you won’t notice the memory leak. g. t. udata –. Based on what REQUEST pads are requested from the session manager, specific functionality can be activated. Specifically, for each url, a uridecodebin element is initialized and attached to a queue element. (If you count the number of threads on the process, you will see that this second example, with a queue, has one more. PAUSED) just block and the next code couldn’t be run. GStreamer GStreamer handles multithreading automatically, but, under some circumstances, you might need to decouple threads manually. 0 -e -vvv fdsrc ! h264parse ! rtph264pay pt=96 config-interval=5 ! udpsink host=2. Performs object tracking on videos and stores it in video buffer metadata. Especially the udpsink is to send UDP packets to the network . We hope its brevity serves as an example of how powerful this framework is! Let's recap a bit. Branching the data flow is useful when e. This will help you find the proper plugins you need to connect to encode and save the stream. sh script. Start the signaler running it as background. How to quickly build a pipeline from a textual description using gst_parse_launch(). It is not run as part of jupyter notebook but can be checked in console to check if all the components works in pipeline and can be called in jupyter notebook. Unlike most GStreamer elements, appsrc provides external API functions. You can query how many buffers are queued with the level argument. basic-tutorial-3. 192 Dec 29, 2020 · Hi, trying to run examples-camera/gstreamer on the Coral Dev Board Mini (with a Coral cam and a HDMI display connected) I get: $ bash install_requirements. Use --gst-debug-help to show category names Example: GST_CAT:5,GST_ELEMENT_*:3,oggdemux:5 Mar 8, 2022 · I wanted to find a minimum reproducible sample to understand the queue behavior. 1 API to 1. The main GStreamer site has Reference Manual, FAQ, Applications Development Manual and Plugin Writer's Guide. I do not have much experience with this but If I can get the errors to go away then I will make my first pull request. 0 ~ +1. 0 -e udpsrc port=5600 ! Here is an example without the tee/qmlsink pipeline: gst-launch-1. Try setting max-buffers=3 or lower. 2 one can also use the debug level names, e. Part Number: TPS65982 We find the bin file in the below directory: C:\Program Files\Texas Instruments\TPS6598x Application Customization 2_15rc2\tps6598x-app-customizer\gui\binaries. Gstreamer is most often used to power graphical applications such as Totem, but can also be used directly from Before running any of the following pipelines you need to set up the credentials using the environment variables or adding the element properties to the kinesiswebrtcbin element. Also recall that the nvv4l2camerasrc has an internal queue which may get filled, so I recommend adding a queue max-size-buffers=3 leaky=downstream right after the camera. try adding queue parameter leaky=2 to test if it helps (very similar to 1, just different technique) Analyze debug logs as of which queue is first blocked. 0 -v -m --gst-debug=3 \. This is not what is expected. One needs to use separate queue elements (or a multiqueue) in each branch to provide separate Reports that enough (min-threshold) data is in the queue. For example, if your set max-size-buffer=100, max-size-time=10000000000 and max-size-bytes=20 you are: Allowing a maximum of 100 buffers inside the queue. Data is queued till max_level buffers any subsequent buffers sent to this filter will block until free space becomes available in the buffer. look at our GStreamer pipeline examples for rpi-cam0 io-mode=5 ! queue leaky=2 ! video/x-bayer gstreamer leaking memory when not using pulseaudio. How to extract data from a general GStreamer pipeline. When running the following pipeline in another terminal, the above mentioned pipeline should dump data packets to the console. 4. If I set to not leak, the rpjbuffer will fill up. GStreamer-example. No description available. First of all, we need to initialize the GStreamer Daemon. ) Queues add latency, so the general advice is not to add them unless you need them. Jul 24, 2023 · 2. In 15 minutes this leaked 90 MB ! If I use software videoconvert I do not get the memory leak, but videoconvert can be very slow, which slows down the framerate. 10. Use this signal together with the underrun signal to pause the pipeline on underrun and wait for the queue to fill-up before resume playback. The problem is that it leaks before the decoder and not after. "queue leaky=1". 0 and since I wanted to build plugins as well and not pollut my MacOS, with different versions of gstreamer and others, I decided to use Docker. Start with a fixed amount of bytes, measure the time between rebuffering and increase the queue size until the time between rebuffering is within the application's chosen limits. 0 # - feed the input to the model # - get argmax of the output and get the corresponding label by image_labeling tensor_decoder # - overlay the result text on the Jun 7, 2021 · I am using gstreamer 1. Gstreamer can be confusing at times, but I really suggest that you look around a bit longer next time. set_state (Gst. 1 port=7001 ! decodebin ! videoconvert ! xvimagesink. 29, good 0. 0 -v udpsrc ! fakesink dump=1 A pipeline to read from the default port and dump the udp packets. Just open a terminal (or console window) and go to the bin directory of your GStreamer installation (Read again the Installing GStreamer section to find out where this is), and you are ready to start typing the commands given in this tutorial. py:1035): d GStreamer and ROS can work together to deliver modular and optimized systems using images and audio to make decisions on actions to be performed by the robot. This will print the port for the signaler which you will use for the SERVER_URL. 'wbmode=0 awblock=true aelock=true '. Examples for such elements are audio sinks and sources with an internal ringbuffer, leaky queues and in general live sources with a limited amount of internal buffers Dec 14, 2021 · ROS (Robot operating system) has a big impact on the development of multimedia products, obtaining images, audio samples and data from hardware sensors all around the system. To actually generate udp packets on the default port one can use the udpsink element. GStreamer is a library for constructing graphs of media-handling components. It is then parsed and demultiplexed by the Tsparse and Tsdemux The goal of a leaky queue is not block if downstream is blocked, but queries wait forever, so we'd rather drop the query after a timeout if it doesn't get answered in a reasonable time. py (detect. --gst-debug=*sink:LOG. I. 14. This tutorial shows how to do this and, in addition, completes the exposition about Pad Availability. sh t=0 0 a=tool:GStreamer a=type:broadcast m=video 4444 RTP/AVP 96 c=IN IP4 127. Saved searches Use saved searches to filter your results more quickly If the current element has leaky buffering, i. ) gst-launch-1. 1 s=Session streamed by GStreamer i=server. You signed out in another tab or window. This is related: Memory leak in DeepStream - #12 by marcoslucianops . Here it is looking for a local host stream that can be generated before with: NNStreamer Unit Test. When requesting a given sinkpad with gst_element_request_pad , the associated srcpad for that Aug 24, 2022 · We will explain this example using the shell interface of Gstd on a Jetson Xavier NX device. In this way if some thread encounters the packet loss, the other thread buddies compensate for it. You can run the unit tests using the following command to get insights into the integration status of nnstreamer on Yocto. if you feed two queues, and only one queues src pad is connected to a consumer, syncing will control how fast buffers in the non-linked queue are removed. Jun 30, 2022 · The issue is that there are some versions of g_intern_string, for example, the one in libglib-2. queue leaky=2 ! tcpserversink port=7001 host=0. How to create an automatic playback pipeline Aug 1, 2022 · Hi all, I’m facing some weird issues with corrupted frame with my gstreamer pipeline utilising the nvjpegdec. Wait for the state changes to complete before trying to change it again. Extract and expose as a stream the CODEC alpha. This session can be used to send and receive RTP and RTCP packets. maxConnections has been restricted to 1. 6, that have a bug where, when they grow the buckets array for a hash map, they fail to free the old array. Burn adjusts the colors in the video signal. With 64 streams, the memory leak is evident in a few seconds using utilities such as top and htop. c","path":"plugins/elements/gstcapsfilter. When I want the bin to stop recording, I block the src pad of the queue and send EOS to the sink pad of the bin queue is connected to and then unlink the processing bin. Here is an example of a Gstreamer pipeline that uses the Tee element: gst-launch-1. Alternatively in newer versions of GStreamer, the appsrc (which interpipesrc is built upon) emulates Feb 8, 2022 · The following code get in inputs a list of url and it create a Gstreamer pipeline. On line 150 you can select how many decoding bin you want to create using the stream above. The following sample simulates a digital camera that allows displaying a live preview, record video, and taking snapshots. 264エンコード等の処理だけGStreamerを使うことも可能です。. 5. Before I was doing that streaming to GStreamerHUDApp using this stream pipeline from the Raspberry: raspivid -t 999999 -h 720 -w 1080 -fps 25 -b 500000 -o - | nohup gst-launch-1. 20 Dec 10, 2019 · From the documentation, mp4mux needs an EOF to finish the file properly, you can force such EOF with gst-launch-1. Check the bus for the state change emitted from the pipeline. Use this env variable upon running your stuff GST_DEBUG=3,queue_dataflow:5 (I think it was 5 and I hope I remember the debug category for this correctly) Nov 12, 2023 · はじめに. Mar 6, 2023 · For example a Digital Camera system. コマンドラインでも簡単に実行出来ますし、その他のアプリケーション (C++等)からH. How to access and manipulate this data. Procedure. 1). com Apr 10, 2024 · To me it sounds like what you really want is a leaky queue, so that in case the (real) sink consumes data too slowly (e. Copy this code into a text file named basic-tutorial-3. Most of the time, audiorate is not what you want. May 26, 2016 · I suggest that you use gst-inspect-1. The plan is to run this pipeline for several hours, and there is a chance that during I set the queue to leak old buffers using leaky=2 with the max-size-time=N*10^9 for N sec. Multiqueue is similar to a normal queue with the following additional features: The element handles queueing data on more than one stream at once. e. This is needed by gst-plugins-bad!2363 (merged), because webrtcbn puts a pad block after a leaky queue. using different audio/video sources (decklinksrc, videotestsrc, audiotestsrc) capture Video only, without audio. 0 recover-policy=keyframe sync-method=latest-keyframe sync=false def main(): #introducing debug in the program itself! May 5, 2022 · However, the appsink is not limited and may queue a large amount of buffers. This tutorial targets the GStreamer 1. Connect and share knowledge within a single location that is structured and easy to search. The session manager currently implements RFC 3550 including: RTP packet validation based on consecutive sequence numbers. Sep 16, 2019 · Hi there, I am running a 5-sensor (12MP/30fps) setup on Xavier w/ latest L4T R32. Mar 19, 2021 · I used the gstreamer/gstreamer. Even though C is not an Object-Oriented (OO) language per se, the GStreamer framework uses GObject s, so some knowledge of OO concepts will come in handy. The default queue length is set to 100. The GStreamer application, which is provided by Xilinx, and moved to the top of the PATH when you sourced the setup. I am using queue in between tee and rtpvp8pay/rtpopuspay. For example this file: v=0 o=- 1188340656180883 1 IN IP4 127. ALOT. leaky-type “leaky-type” GstAppLeakyType * When set to any other value than GST_APP_LEAKY_TYPE_NONE then the appsrc will drop any buffers that are pushed into it once its internal queue is full. it drops data by itself when its internal buffer is full, it should take the minimum of its own maximum latency and upstream’s. ! queue ! x264enc ! mp4mux ! filesink location=xyz. Feb 2, 2021 · :twisted_rightwards_arrows: Neural Network (NN) Streamer, Stream Processing Paradigm for Neural Network Apps/Devices. May 17, 2020 · First, I tried to make the whole pipeline PAUSED, but the line of code. The selected type defines whether to drop the oldest or new buffers. The appsrc element can be used by applications to insert data into a GStreamer pipeline. Install Gst Python Bindings To use gstreamer in python codes, we need to install gstreamer python bindings. In this sample, there is 1 source pipeline labeled as: cam_src_pipe. Queues have been explained in Basic tutorial 7: Multithreading and Pad Availability. I’d like to use a the queue to drop data in a more complex pipeline when the pipeline can’t process the frames fast enough. (The video output rate is the same as the original video frame rate. Parameters: queue –. Allowing a maximum of 10 seconds worth of buffers inside the queue. Examples gst-launch-1. EDIT, Example: Mar 8, 2022 · Add your rtsp video url at line 149. The buffering element can be inserted anywhere in the pipeline. - gst launch script examples · nnstreamer/nnstreamer Wiki Mar 11, 2018 · GStreamer is a toolkit for building audio- and video-processing pipelines. Except that it's all useless if the thread gets blocked Jan 20, 2012 · I just noticed this note from Gstreamer Cheat Sheet: Note: We can replace theoraenc+oggmux with x264enc+someothermuxer but then the pipeline will freeze unless we make the queue [19] element in front of the xvimagesink leaky, i. I have a Python gstreamer pipeline where I am streaming from several RTSP sources and processing frames that arrive at an appsink element. The Queue used for sending thread continue to increase without restriction. zt la gd bp js by xk ww pd lh