Gstreamer h264 encoder example. All gists Back to GitHub .

Gstreamer h264 encoder example 10 which has packages ready for libx265. nv12 or /tmp/xil_dec_out_*. Hi all, I would like to convert an encoded . mp4. It can have presets for: * passes (1,2 or 3 passes) * profiles (Baseline, Main, ) * quality (Low, medium, High) In order to programmatically know which This example pipeline will encode a test video source to H264 using constant quality at around Q25 using the 'medium' speed/quality preset and restricting the options used so that the output # sender gst-launch-1. 0 x264enc and are as follows:. I’ve consolidated the dependencies for all of them below. (Note: this is a live stream with no end, after a few seconds kill the process to see the resulting file). Source is a Axis camera. The video used in these tests was big_bucky_bunny_480p_h264. I would like to use it on jetson nano with gstreamer, since faster than ffmpeg. All gists Back to GitHub (string)video, clock-rate=(int)90000, encoding-name=(string)H264, payload=(int)96 "! rtph264depay ! h264parse ! avdec_h264 ! videoconvert ! autovideosink # fps gst-launch-1. Modified 2 -launch-1. 265/HEVC, VP9, codecs for hardware-accelerate encoding. Features Supported Using gst-v4l2 ¶ My question is for 2nd pipeline. 4, GStreamer has four main modules GStreamer, base, good, bad, ugly and each has its own set of dependencies. For example, I’ve created an RGBA or RGB file. I have tested with ELP’s H264_Preview. 264, H. So our encoder just adds an additional audio track to the main stream. Setting pipeline to PLAYING New clock: GstSystemClock x265 [info]: HEVC encoder version 0. (works correctly) Write encoded bytestream into V4L2 device. gst-launch-1. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company vtenc_h264. Can anyone give me some sample code? This example accepts a clip that is already encoded in H. GStreamer Libraries; user could use vendor specific plugins, Intel Media SDK and NVCODEC plugins for example. exe vaapi No such element or plugin 'vaapi' How can I accelerate that pipeline or enable Hardware acceleration to reduce delay? Maybe using another encoding? Source code example In simple words, Gstreamer allows you to create very complex media piplines and run them in your terminal, or using the GStramer API (which gives you more capabilities). Note: Display detailed information on omxh264enc or omxh265enc encoder We are using gstreamer to write the processed video on the local computer. nveglglessink (windowed video playback, NVIDIA EGL/GLES videosink using default X11 backend): Enter this command to start the GStreamer All the GStreamer plugins included in the Xilinx Video SDK are released under the Vitis Video Analytics SDK (VVAS), a framework to build GStreamer-based solutions on Xilinx platforms. 0 Video Cropping with Gstreamer-1. 264 video streams using NVCODEC API CUDA Mode H264, H265 and more Encoder and Multicast/Unicast Streamer (example of how to use Live555 and FFMPEG) - alm4096/FFMPEG-Live555-H264-H265-Streamer The parameter-sets value is just an example of how the udpsink caps must be copied and changed for . 264 and save it to a file: #Take camera input /dev/video2, encode it to h264 at a bitrate of 10mbit/s (CBR) and save to a file. 0 Install GStreamer-1. mp4 -e Running your pipeline with GST_DEBUG=2 shows a warning: vaapi gstvaapiencoder. This is a pipeline which does the job with gstreamer-1 and reads the source only once: GStreamer Pipeline Samples #GStreamer. After entering the SERVER GStreamer pipeline, VLC allows to play the . The following example works, but is going through the additional step of re-encoding the existing h264 video as h264. 0 audiotestsrc is-live=true ! faac ! aacparse ! faad ! autoaudiosink Here the audiotestsrc acts as if it was a live source. You can look at SmoothStream for an example of handling the network protocols, and compressing the image is as easy as using the OpenCV encode function and setting the JPG compression level to somewhere below 30, depending on how much you value image quality compared to FPS. cudaconvertscale – Resizes video and allow color conversion using CUDA . sh executes a sample pipeline to encode CSI camera captured video into H. speed-preset : Preset name for speed/quality tradeoff options (can affect decode compatibility - impose This can support both decoding and encoding depending on the platform. This plug-in accepts input encoded stream in byte Encode buffered data as H264 with NvVideoEncoder class. exe tool on I am attempting to use gstreamer to demux an h264 video stream, and wrap the video stream using mp4mux. Navigation Menu Toggle navigation. 6by9 Raspberry Pi Engineer & Forum Moderator Posts: 17232 This is an example project to show how to streaming from android camera to VLC or gstreamer. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company I'm trying to capture H264 stream from locally installed Logitech C920 camera from /dev/video0 with Gstreamer 1. 0¶ This section describes example gst-launch-1. Right now we are using following code to write video using gstreamer. Page; Discussion; English. How do I do it ? I knew that I can do it in ffmpeg (using -acodec copy and -vcodec copy options )but I It is quite simple to implement (there are code examples for generating LTC sound stream on the net). c:591:set_context_info: We are only supporting YUV:4:2:0 for encoding,please try to use vaapipostproc to convert the input format! I am using gstreamer to build a pipeline which splits an incoming video stream into two branches, one of which is displayed on the screen, and the other one is encoded and saved on the disk. 265 support in gstreamer nowadays. MX6 processors! If there are other examples you would like to see, please add to the For example, the gstreamer-vaapi plugin offers the vaapidecode, vaapipostproc and vaapisink elements that allow hardware-accelerated decoding through VAAPI, upload of raw video frames to GPU memory, download of GPU frames to system memory and presentation of My GStreamer C++ tutorial, focusing on using appsrc and appsink for video/audio processing - agrechnev/gst_app_tutorial. 264 => storing as a local . 0 udpsrc uri=udp://239. How about this pipeline: $ gst-launch-1. flv as input which is already h264/aac encoded in flv format. This includes the GLib "main loop". mov Encode VA-API based H. video/x-h264: stream-format: byte-stream alignment: au profile: { (string)constrained-baseline, (string)baseline, (string)main, (string)constrained-high, (string)high } Decoder Example Pipelines¶. During the last months of 2023, we, at Igalia, decided to focus on the latest provisional specs proposed by the Vulkan Video Khronos TSG group to support encode operations in an open reference. I managed to stream jpeg with multicast but not h264. , GPU), there can be multiple plugin features having the same role. Furthermore, the audio and video streams are not synchronized when you do this. Inner workings of hardware-accelerated video decoding plugins. from media servers to This does not replace, but complements the official GStreamer tutorials. Encoder Inputs and Outputs¶. clock-rate=(int)90000, encoding-name=(string)H264' ! GStreamer plug-in that provides functionality to decode H. In this case, I suppose both qtmux and matroskamux use avc H264 stream-format. GStreamer Pipeline “v4l2src device=/dev/video1 ! I'm familiar with ffmpeg, but not with GStreamer. Use the latest git master version of libimxvpuapi, and when using its --imx-platform switch, be sure to pass imx8mp to it, not imx8mm. 264 video encoder: vah265dec: Codec Decoder Video Hardware: VA-API based H. Refer to the Decoder Pipeline example for an illustration of how to use this plugin. Read; View source; View history; From RidgeRun Developer Wiki Dual H264 Encoding from Camera FILE_A=filenameA. This method suited us better than “fiddling” with SEI timecode insertion Doesnt work when I send the EoS to the mp4mux. 265 encoded streams using Xilinx VCU decoder for PCIe platforms. Also note that it is advised to add parsers after encoder elements. 2nd pipeline is taking cam. I'm trying to create a simple gstreamer1-0 pipeline that encodes and decodes h264 a webcam feed hopefully using the most basic elements possible. I have two questions: how can I change the encoding element and replace x264enc with nvv4l2h264enc so that the encoding also run in GPU? I tried to simply replace one for the other but I runs into Supported H. 0 videotestsrc ! tee I'm new to gstreamer-rs. This plugin consists of various hardware/software video encoders software audio encoders, and video capture (from webcam) elements. cudadownload – Downloads data from NVIDA GPU via CUDA APIs . 0 -v videotestsrc \ ! ' video/x-raw,format=I420,width=1920,height=1080,framerate=60/1 ' \ ! omxh264enc insert-sps-pps=true bitrate=16000000 \ ! h264parse \ ! rtph264pay pt=96 \ ! udpsink For installing H. At the moment I am using the example code for encoding profiles as follows: let p = gstreamer_editing_services::Pip Hello, I’m trying to do a simple jpg → x264 encode video → client x264 decode and display (in a logic of a future server to client com) but I don’t find a way to make the decode part work. h264 ! h264parse ! 'video/x-h264' ! omxh264dec! videoconvert ! nvv4l2h264enc ! h264parse ! mp4mux ! filesink if possible, use gstreamer-1; your solution reads the source file twice. Gstreamer TCPserversink 2-3 seconds latency - #5 by DaneLLL. mp4 Hi 🙂 I’m using the UB0212 model, with the IMX323 sensor and Sonix SN9C292B encoder chip. 265 encoder. I try to render a video using GStreamer Editing Service. It is frequently used in internet streaming sources i. 0 filesrc location=vid-20211114_211850. - dkorobkov/gstreamer-vaapi-E3845-H264-encoder-example I'm trying to stream a video with h264. 265/VP9/AV1 Encoder Features with GStreamer-1. Video Processing Overview . 0 x265 [info]: build info [Linux][GCC 7. Improve this answer. For example, the gstreamer-vaapi plugin offers the vaapidecode Hello I am new to gstreamer and in our application we need to capture the video using and transmit it through Network using I. Dependencies. You can read both audio and video streams out of qtdemux. With Jetson, the decoder selected by uridecodebin for h264 would be nvv4l2decoder, that doesn't use GPU but better dedicated HW decoder NVDEC. 0 videotestsrc ! video/x-raw,width=640,height=480,format=YUY2 ! x264enc ! shmsink socket-path=/tmp/foo sync=true I’m trying to get a working gstreamer pipeline to encode a RGB or RGBA source to H264 video. H264 video encoder based on Intel MFX. 2. 0 filesrc location=video. The most powerful video formats for the video codec are Video Coding Experts Group (VCEG) and ISO/IEC JTC1 Moving Picture Experts Group (MPEG). The "pass" property controls the type of encoding. I want to run the H. 265 Encoder Features with Gstreamer-1. Example pipeline gst-launch-1. arguscam_encdec. The plugin accepts an encoded bitstream and uses the NVDEC hardware engine to decode the bitstream. Intel Quick Sync H. The decoded output can be NV12 or YUV444 format which depends on the encoded stream content. 194. Using GStreamer 1. YUV/MJPEG output works, but h264 mode using Gstreamer (or FFmpeg) I can only see it sending keyframes so the stream is 1fps or even 0. Please refer to Jetson Nano FAQ Q: Is there any example of running RTSP streaming? After this was done we created a "pipe" file I believe is called using mkfifo, both for the input and output file. 0 Video Transcode with Gstreamer-1. Follow Description. 264 video decoder: vah264enc: Codec Encoder Video Hardware: VA-API based H. This demo project use MediaCodec API to encode H. Example launch line gst-launch-1. GStreamer is integrated to provide wrapper plugins over the V4L2 interface and to assist in setting up video processing pipelines. On IoT Yocto, video encoder, decoder, and format conversion hardware provide the V4L2 interface to userspace programs. I'm starting with gstreamer, I managed to do b Hello, I managed to implement a basic pipeline that decodes a h264 stream from RTSP, encode it back again and store it to disk in chunks of a specified size. 265 MP4 file. e. For a system with multiple MediaFoundation compatible hardwares (i. Encode H. 0 , in addition to a package config file, will be produced and includes all enabled GStreamer plugins and libraries. With jpeg I used following command: gst-launch-1. After some trial and error, i found this pipeline that work as expected: gst-launch-1. 0 CUDA Video Post-Processing with Gstreamer -1. cudaipcsrc – Receive CUDA memory from the cudaipcsrc element Modification of test-appsrc from gst-rtsp-server that works with vaapiencode_h264 on Intel Atom E3845 CPU. i got the follow message from gstreamer debug: 091:gst_clock_get_time:<GstSystemClock> It may have additional latency causing the audio sink to drop all samples. 0 on the platform with the following commands: sudo add-apt-repository universe sudo add-apt-repository multiverse sudo apt-get update sudo apt-get install gstreamer1. My first question is : FFMPEG GPU based will be supported in the futur on Jetson Nano? Second, Is it possible to have a concret example with Gstreamer and steps to follow in I found this question/answer after asking myself the same thing. Personally, I vouch for Home; Tags; About; Vulkan Video encoder in GStreamer. In case of Constant Bitrate Encoding (actually ABR), the "bitrate" will determine the quality of the encoding. Navigation Menu Note: Our examples are written in C++ and not C. The backlog functionality is a bit dependent on the encoder though - if the encoder has a fixed buffer pool on the output side it might not support keeping lots of data in a backlog in the queue. GitHub Gist: instantly share code, notes, and snippets. nv12_10le32 based on 8 I need to stream my screen in fullHD, to my android phone with gstreamer, using H264. 0 Video Scaling with Gstreamer-1. I don't intend to save the H264 data directly as a local file because I need to do other processing. Using gstreamer with c920 webcam to stream h264 video - Lucien0907/gstreamer-remote-h264. Example: Video Playback Using GStreamer They’re really easy to throw together. These APIs generally offer a number of functionalities, like video decoding, post-processing, or presentation of the decoded frames. (attached image) So How we can post over the network rather than writing To install GStreamer-1. 0 This section describes example gst- launch-1. 264 encoder. h264 nvcudah264enc. Ask Question Asked 2 years, 11 months ago. gst-launch rtspsrc location=rtsp://172. Skip to content. Sign in Product GitHub Copilot. cudaipcsink – Send CUDA memory to peer cudaipcsrc elements . 0 usage for features supported by the NVIDIA accelerated H. And if that works, then perhaps I can stop/start the vpuenc_h264 element to get it to restart the encoding with a fresh key-frame. This element encodes raw video into H264 compressed data, also otherwise known as MPEG-4 AVC (Advanced Video Codec). Can anyone point me towards a tutorial/example of something similar and perhaps explain which of both RTSP and RTP (or both?) would be best to use for this? here the pipeline is using x264enc and H. 0 -v udpsrc port=5000 I'm new to gstreamer and can't figure out how to create a working pipeline for the following example. The values can be found using gst-inspect-1. C:\gstreamer\1. H264 File Sample Example Source Code At the end of my message, you will find the code for my sample project, an example h264 elementary stream file, and a screen output. After writing a gstreamer plugin you can change the above pipeline to use your encoder. 0 This section describes example gst-launch-1. 265 video encoder: vajpegdec: Codec Decoder Image Hardware: VA-API based JPEG image decoder: valve: Filter Use a V4L M2M based API/method to use the H264 HW codec in the chip. sdp files compatible string. Let’s install the required My question is for 2nd pipeline. Now, as my USB webcam (which is video1, video0 being the computer's built in camera) supports h264 (I have checked using lsusb), I would like to try to get the h264 feed directly. gstreamer hangs when encoding a splitted stream with h264. 264 and will decode it using vvas_xvcudec plugin into a raw NV12 format. MX6Q board. mp4 file. 0 -v videotestsrc ! vtenc_h264 ! qtmux ! filesink location=out. 265, AV1, JPEG and MJPEG formats. 265 encoding. . The ama_av1enc, ama_h264enc and ama_h265enc plugins provide support for hardware-accelerated encoding using AMA compatible devices, for AV1, AVC and HEVC. We implemented it as gstreamer plugin. Jetson Xavier NX GStreamer example pipelines for H264 H265 and VP9 Encoding. Write better code with AI Gstreamer-1. My project is on github gstreamer_example but I will try to be as clear as possible. 0 You would use uridecodebin that can decode various types of urls, containers, protocols and codecs. 0 with the GStreamer-imx plugins is a powerful way to access and apply the multimedia capabilities of the Freescale i. How do I do it ? I knew that I can do it in ffmpeg (using -acodec copy and -vcodec copy options )but I don't use ffmpeg . mp4 FILE_B=filenameB. This is my server pipeline loaded_images = Tools::getAndLoadFiles("images_test/"); mdata. mkv Contribute to bozkurthan/Gstreamer-Pipeline-Examples development by creating an account on GitHub. Features Supported Using gst-v4l2 Accelerated GStreamer User Guide DA_07303 | 7 . I’ve Sample Video Encoding GStreamer Pipelines for NVIDIA Jetson. One is a transmitter pipeline, and the other is a receiver pipeline. Read; View source; View history; More. This is with gstreamer 1. 0 , when doing a static build using --default-library=static , a shared library gstreamer-full-1. 0 -e nvarguscamerasrc ! 'video/x-raw(memory:NVMM Hi, I’m trying to decode h264 video and gets the frame, I get the buffer by CB function as the follow: liveViewCb(uint8_t* buf, int bufLen, void* pipline) { // DO something with the buffer } I wrote program that success to decode the first frame or more depends on the frame size. 264/AVC, H. Write better code with AI Security encoding-name=H264 ! rtph264depay ! h264parse ! avdec_h264 ! videoconvert ! autovideosink. I already have (theoretically) Take for example the H264 encoder. Here we focus on using appsrc and appsink for custom video (or audio) processing in the C++ code. 0 Video Playback with Gstreamer -1. 0 imxv4l2videosrc device = /dev/video2 ! imxvpuenc_h264 bitrate = 10000 ! filesink location = /tmp/file. Share. mov. This will similarly be the case if this target bitrate is to obtained in multiple (2 or 3) Supported H. Encoder Plugin ¶. 6. If you are using Yocto, just modify libimxvpuapi's recipe accordingly. 0][64 bit][noasm] 8bit x265 How to stream H264 with gstreamer? H264, H265 and more Encoder and Multicast/Unicast Streamer (example of how to use Live555 and FFMPEG) - alm4096/FFMPEG-Live555-H264-H265-Streamer. And not sure how you launch the RTSP server. 0 Installation and Setup Decode Examples Encode Examples Camera Capture with Gstreamer-1. Input: NV12_4L4, I420, NV12_10LE32, Many more pipeline examples are described and listed on the Gateworks Software Wiki GStreamer Pipelines page. 0\msvc_x86_64\bin>gst-inspect-1. 5fps (the amount of data also matches this, 50KB/s rather than 500KB/s). arguscam_enc. I think that should For a research prototype, I need to have two synchronized HD video streams and one audio stream inside a streamable container for real-time communication (basically Skype with an additional secondary video stream). Hot Network Questions World split into pocket dimensions; protagonist escapes from windowless room, later lives in abandoned city and raids a supermarket Merging overlapping points and adjusting their size based on sample count in QGIS Which is larger? 4^(5^9) or 5^(6^8) How much is this coin in GStreamer uses a meson and ninja build system for its builds. Supported H. It supports H. 0 Video Format Conversion with Gstreamer-1. After a bit more research, I thought I should share my findings. rgb ! video/x-raw, format=RGBA,width=2880, height=1440, framerate=30/1 ! nvvidconv ! video/x-raw, format=NV12 ! omxh264enc ! qtmux ! filesink location=test. this is my test pipeline. 10 December 2023; GStreamer; Vulkan; Encoder; Vulkan Video encoder in GStreamer #. Note: Our examples are Hello, I would like to use jetson Nano to do GPU based H. 265/AV1 Encoder Features with GStreamer-1. 264/H. v4l2-ctl --list-formats shows that camera is capable to give H264 I know this is an older post, but you can set the GstX264EncPreset value using a simple integer that corresponds to the preset value. 264 encoder on an FPGA, and I'm thinking whether it's worth trying to implement inter prediction if I have RAM limitations. I saw in another thread that FFMPEG is not supported on jetson Nano and Gstreamer should be use instead. To enable the H264 encoder, The version of the GStreamer plug-in must be consistent with the version of the GStreamer framework. 1 The imx8m plus does not have an H1 encoder, it has the VC8000E encoder. h264 file to a . 264 data and simply wrap with UDP packet then send these packets to VLC or gstreamer. In your case the problem is a) linking decodebin to videoconvert (it has sometimes pads, you need to connect to the "pad-added" signal and link from there, check the GStreamer docs), b) linking the queue to mp4mux (it has request pads, you have to use gstreamer--->h264 encoder--->shmsink shmrc--->process1 shmrc--->process2 i was able to get raw data from videotestsrc and webcam working. msdkh264enc. An example of such a pipeline is: grabbing frames from a camera => reducing the framerate => cropping => resizing => encoding to h. 0. That's not necessary. 0 videotestsrc ! qsvh264enc ! h264parse ! matroskamux ! filesink location=out. As the Khronos TSG H264 encoder supports the webcam redirection feature for 64-bit apps on the VDA. MX6Q SDP board which contains the MIPI and parallel camera. We are NOT using any GLib stuff we don't really need. Also, there would be additional software video encoder element the system meets I would like to stream live video from a RealSense camera through udp packets with Gstreamer and with h265 codec. I found that the 'alignment' property in avdec_h264 corresponds to the frames used in gst_pad_push. g_object_set(encoder, "speed-preset", 2, NULL); works for me. 265 video decoder: vah265enc: Codec Encoder Video Hardware: VA-API based H. Example of a strictly increasing I have read that I can use vaapih264enc but seems to be not available in my gstreamer installation. I want to decode a h264 stream from a network camera. You may try test-launch. For gstreamer I don't know, but for ffmpeg decoding or encoding use/force the codec: h264_v4l2m2m See: But I see no problems in Jellyfin for example, which uses encoding via h264_v4l2m2m for older/incompatible codecs. 0 v4l2src element. 265/AV1 encoders. sdp file during 10 Encoding raw video into h264 using gstreamer. mp4 gst-launch-1. For start i want to capture the video using parallel camera and i want to encode (as H To satisfy the requirements of high quality and low bit stream video for real time applications, video compression techniques are used. 0-tools gstreamer1. Apple VideoToolbox H264 encoder, which can either use HW or a SW implementation depending on the device. 1 compiled from source on Ubuntu 15. sh executes two pipelines. Without the muxers if I save the encoded stream directly, file is not playable (gst-play complains 'could not determine type of stream') Also, I think you are - matroskamux is more recoverable than mp4mux. Features Supported Using gst-v4l2 ¶ If both sinks need the same resolution/profile of H264 encoding, yes it would be better to only encode once. pipeline = cudaconvert – Converts video from one colorspace to another using CUDA . 264 plugins in a non-VPU board, please follow this post. GstMediaFoundation plugin supports H. The following examples show how you can perform video playback using GStreamer-1. But now we want to send this output over the network without writing on the local computer, so that anyone can access this output using IP. I know how to get a H264 frame through ffmpeg, for example, I can get a H264 frame through AVPacket. I am having I. But for h264 encoded data it doesn't. If you could, please do try running the commandline pipelines I've mentioned in the question. 264 For example, to encode a video from a camera on /dev/video2 into h. A little late but, maybe some people will find this question when seeking info about H. In other-words, if alignment is 'nal', then avdec_h264 expects the data in a single gst_pad_push call to be a single 'nal'. Summary. 0 videotestsrc num-buffers=90 ! msdkh264enc ! h264parse ! filesink location=output. In such situation, GStreamer is used mainly for encoding and decoding of various audio and video formats. 264 video encoder plugin based on libx264) Static build Since 1. I'm using gst launch remote on Android and gst-launch on linux. 0 nvarguscamerasrc ! 'video/x-raw(memory:NVMM), width=1920, height=1080,format=NV12, framerate=30/1' ! qsvh264enc. GStreamer has four main modules GStreamer, base, good, bad, ugly and each has its own set of dependencies. For example, if you install Gstreamer1. When streaming H. I want to stream it without decoding/re-encoding using gstreamer. 0-alsa \ x264 (H. 18. I understand that this feed is muxed in the mjpeg one, but looking around on the web it seems that gstreamer is able to get it nonetheless. Decodebin and autovideosink H264 Encoding from camera FILE=filename. Source code and build scripts for the GStreamer plugins developed by Xilinx can be found the in the sources/video-sdk-gstreamer folder of the Xilinx Video SDK repository. After that I believe Im supposed to save the video I took in a h264 encoding using a command that I found: You're not checking the return values of any functions. The raw file is saved to disk at /tmp/xil_dec_out_*. Linking elements can fail for example, or setting the state. 265/VP9/AV1 encoders. For a research prototype, I need to have two synchronized HD video streams and one audio stream inside a streamable container for real-time communication (basically Skype with an additional secondary video stream). 4. But I don't know how to use GStreamer to get a frame of h264. emgmw pup hlmgj jfoci tbyx iwyyn wdodiz tgqhxpp jvyrab sstulv