Making statements based on opinion; back them up with references or personal experience. Use MediaCodec Decoder examples. Counting from the 21st century forward, what is the last place on Earth that will get to experience a total solar eclipse? "WARNING: width or height not multiple of 16". So is there a way to "unlock" the frame rate? We do that here to exercise the API. // H.264 Advanced Video Coding: private static final int FRAME_RATE = 15; . // do this before we try to stuff any more data in. I'm working with Android MediaCodec and use it for a realtime H264 encoding and decoding frames from camera. // The storage associated with the direct ByteBuffer may already be unmapped, // so attempting to access data through the old output buffer array could, // this happens before the first frame is returned, "unexpected result from deocder.dequeueOutputBuffer: ", // As soon as we call releaseOutputBuffer, the buffer will be forwarded, // to SurfaceTexture to convert to a texture. I've been rendering video through the MediaCodec directly to a Surface that was taken from a SurfaceView in my UI. * Generates a frame of data using GL commands. So for a SurfaceView or a MediaCodec encoder, you create the object, and get its Surface. It's designed for low latency and low power use. If the parameter is set to a too small value (e.g. // configure() call to throw an unhelpful exception. This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. Where life gets interesting is when you want to do both of those things at the same time. Only expected on first packet. Reason: no idea. Your approach of dropping encoded B frames won't help with latency. So . // Check for color formats we don't understand. Are you sure you want to create this branch? Old eclipse project and Java example; 2020 : chagen Android Studio 4.1.1 base. It is decoding the mp4 file when I tried decoding H264 file it was not able to read the H264 encoded file. It's important to. The MediaCodec encoder's consumer is in the mediaserver process, though the asynchronicity is better concealed. Now every frame that comes out will be converted to a GLES texture by SurfaceTexture. The output is checked for, * Because of the way SurfaceTexture.OnFrameAvailableListener works, we need to run this, * test on a thread that doesn't have a Looper configured. This works great. The. Where is the MediaCodec encoder's consumer located? Learn more about bidirectional Unicode characters. Here are some of the examples of using it. Throws an exception. To learn more, see our tips on writing great answers. The API doesn't guarantee, // that the texture will be available before the call returns, so we. // e.g. But no good for low-latency applications. EncodeAndMuxTest The idea is to sample, * one pixel from the middle of the 8 regions, and verify that the correct one has, * the non-background color. The data we're generating is just an elementary. The encoder used for Snapdragon 800 devices doesn't. If we don't, // Decoder is drained, check to see if we've got a new buffer of output from, // Get a decoder input buffer, blocking until it's available. Secondly, I'm not sure how to create a SurfaceView from the Surface that the encoder creates. // Send an empty frame with the end-of-stream flag set. When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com. Similar to {@link #checkFrame}, but uses GL to. as "render" argument to releaseOutputBuffer() of the decoder. How do I use MediaCodec with surfaceview? Android - MediaCodec - can an encoder's input Surface, Yes. Please help me I'm stucking on this problem for about half a year and have no idea how to reduce the latency, I'm sure that it's possible because popular apps like Telegram, Viber, WhatsApp etc. Data is provided through. // and pass that to configure(). I think this works. Loop until both assumptions are false. // Set some properties. Sending the MediaCodec decoder output to a SurfaceView is straightforward, as is sending the output to a MediaCodec encoder. Thanks for contributing an answer to Stack Overflow! By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. // if the codec is meeting requirements). Nexus 7 OMX.Nvidia.h264.encoder COLOR_FormatYUV420Planar. It can't even try to encode frame 2(B) until it has encoded frame 5(P). * Performs a simple check to see if the frame is more or less right. Connect and share knowledge within a single location that is structured and easy to search. Can a black pudding corrode a leather tunic? releaseOutputBuffer(, true) The data is sent to Surface instead. If no, * match is found, this throws a test failure -- the set of formats known to the test, * Returns true if this is a color format that this test code understands (i.e. Asking for help, clarification, or responding to other answers. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. * An alternative approach would be to save the output of the decoder as an mpeg4 video, * file, and read it back in from disk. // If we're decoding to a Surface, we'll get notified here as usual but the. * a Surface and decoded onto a Surface. Surfaces are the "producer" side of a producer-consumer arrangement. AAC, MP4 decoder example. // Assume output is available. If we set EOS, // on a frame with data, that frame data will be ignored, and the, "sent input EOS (with zero-length frame)", // the buffer should be sized to hold one full frame, // either all in use, or we timed out during initial setup, // Check for output from the encoder. // are multiples of 16, which all tested devices seem to be able to handle. // need to wait for the onFrameAvailable callback to fire. "unexpected result from encoder.dequeueOutputBuffer: ". Why not? Predicted frames = P (difference from previous frames). Change log. We, // can't actually tell which is the case, so if we can't get an output buffer right. Surface uses native video buffers without mapping or copying them to ByteBuffers; thus, it is much more efficient. As of Marshmallow (API 23), the official documentation is quite detailed and very useful. Why are taxiway and runway centerline lights off center? So in this example the frames get encoded out of order like this: In this example the decoder can't handle frame 2 until the encoder has sent frame 5. You can send the output of the decoder to a single Surface. How do I use Surface to improve encode or decode performance? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. //from https://github.com/vecio/MediaCodecDemo, // We shouldn't stop the playback at this point, just pass the EOS, // flag to decoder, we will get it again from the, "We can't use this buffer but render it due to the API limit, ", // We use a very simple clock to keep the video FPS, or the video, // All decoded frames have been rendered, we can stop playing now. MediaCodec Video Streaming From Camera wrong orientation & color, Substituting black beans for ground beef in a meat pie, Handling unprepared students as a Teaching Assistant. Create a sample using Android MediaCodec. Probably that's why android developers added PARAMETER_KEY_LOW_LATENCY from API level 30. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. // Codec config info. Manual copying is not required. As a test, I want to render to the Surface (as in above) and loopback through a different instance of MediaCodec configured as an encoder. * distributed under the License is distributed on an "AS IS" BASIS. rev2022.11.7.43014. We just, // drained the decoder output, so we expect there to be a free input, // buffer now or in the near future (i.e. We use a short timeout to avoid. encodeCodec.queueInputBuffer(inputBufferIndex, 0, input.length, (System.currentTimeMillis() - startMs) * 1000, 0); Online free programming tutorials and code examples | W3Guides, AVC HW encoder with MediaCodec Surface reliability?, The only working encoder resolution that works looks to be 1280 x 720 (probably because it's the only one multiple of 16), and that one works terrible too, with a FPS of 7-8 in the output. First off, is this possible? Why output buffers stucked on try_again_later (-1)? Nexus 4 0x7FA30C03 OMX_QCOM_COLOR_FormatYUV420PackedSemiPlanar64x32Tile2m8ka, "unable to check frame contents for colorFormat=", // Galaxy Nexus uses OMX_TI_COLOR_FormatYUV420PackedSemiPlanar, // Nexus 10, Nexus 7 use COLOR_FormatYUV420Planar. (This just an optimization. // If we're not done submitting frames, generate a new one and submit it. After filling a range of the input buffer at the specified index submit it to the component. A sequence of frames including B frames might look like this: The encoder must encode each P frame, and the decoder must decode it, before the preceding B frames make any sense. Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. * <p> * The constructor takes a Surface obtained from MediaCodec.createInputSurface(), and uses . * Copyright (C) 2013 The Android Open Source Project. is the a way for solving android h264 decoder delay? Sending the MediaCodec decoder output to a SurfaceView is straightforward, as is sending the output to a MediaCodec encoder. 7 months ago, Developer, The video context is configured for passthrough but is still interpreted as an OpenGL one. This may still be more efficient than using ByteBuffers, as some native buffers may be mapped into direct ByteBuffers. // If we're not done submitting frames, generate a new one and submit it. Nexus 10 OMX.Exynos.AVC.Encoder COLOR_FormatYUV420Planar, // e.g. (This is a huge step up from what was there when this page was . When you use a surface you don't have to feed the byte buffers explicitly to the encoder. GitHub Gist: instantly share code, notes, and snippets. * Holds state associated with a Surface used for MediaCodec encoder input. Will Nondetection prevent an Alarm spell from triggering? Failing to specify some of these can cause the MediaCodec. . Making statements based on opinion; back them up with references or personal experience. All three kinds of data can be processed using ByteBuffers, but you should use a Surface for raw video data to improve codec performance. It looks like this: * We draw one of the eight rectangles and leave the rest set to the zero-fill color. Handling unprepared students as a Teaching Assistant, A planet you can take off from, but never land back. The output is checked for, testEncodeDecodeVideoFromBufferToBufferQCIF, testEncodeDecodeVideoFromBufferToBufferQVGA, testEncodeDecodeVideoFromBufferToBuffer720p, * a series of byte[] buffers and decoded into Surfaces. // away we loop around and see if it wants more input. (clarification of a documentary), legal basis for "discretionary spending" vs. "mandatory spending" in the USA. I'm trying to stream data (h.264 raw 1080p) to android and rendering it to surface view.The problem is that if I send the data faster than 45fps the decoder output is pixelated(the input index & output index are -1 or not ready). They increase quality and latency, and are great for movies. I also tried to use HW accelerated codec and it's the only thing that helped me, when I use it the latency reduces to ~ 500-800 milliseconds but it still doesn't fit me for a realtime streaming. Base Android studio 4.1.1; Use Android MediaCodec. Frames sent to SurfaceView's Surface aren't dropped, so your Frequent 'android-mediacodec' Questions, Stack Overflow Public questions & answers; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Talent Build your employer brand ; Advertising Reach developers & technologists worldwide; About the company, Recently Active 'android-mediacodec' Questions, Stack Overflow Public questions & answers; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Jobs Programming & related technical career opportunities; Talent Recruit tech talent & build your employer brand; Advertising Reach developers & technologists . Galaxy Nexus OMX.TI.DUCATI1.VIDEO.H264E, // OMX_TI_COLOR_FormatYUV420PackedSemiPlanar, // full-size Y, followed by quarter-size U and quarter-size V, // e.g. // stream, not a .mp4 file, so not all players will know what to do with it. // It's usually necessary to adjust the ByteBuffer values to match BufferInfo. // e.g. ffmpeg-mediacodec-encoder [WIP] FFMPEG hardware encoder for Android. I still haven't found a solution to get rid of the latency. will block if you attempt to feed it frames faster than the device refresh rate. I need to test multiple lights that turn on individually using a single switch. Contribute to PhilLab/Android-MediaCodec-Examples development by creating an account on GitHub. * them in parallel. "Debug certificate expired" error in Eclipse Android plugins. Php jquery button click event not working, Html detect input change jquery code example, Shell sql python return rows code example, Find first occurrence of list code example. Why don't math grad schools in the U.S. use entrance exams? Cannot retrieve contributors at this time. // If everything from the encoder has been passed to the decoder, we, // can stop polling the encoder output. * output with MediaCodec and do some simple checks. This demo project use MediaCodec API to encode H.264 data and simply wrap with UDP packet then send these packets to VLC or gstreamer. Stack Overflow for Teams is moving to its own domain! Can an adult sue someone who violated them as a child? * See http://b.android.com/37769 for a discussion of input format pitfalls. To learn more, see our tips on writing great answers. I think I want the encoder to create this surface and then have the decoder MediaCodec use this as the surface to draw to. On those devices I get the SPS and PPS and the first Keyframe, but after that mEncoder.dequeueOutputBuffer(mBufferInfo, 0) only returns MediaCodec.INFO_TRY_AGAIN_LATER. One way to, // handle this is to manually stuff the data into the MediaFormat. The SurfaceView's consumer is in the system compositor (SurfaceFlinger), which is why you have to wait for the "surface created" callback to fire. you're overwriting a buffer of H.264 data that is still being read from. Are witnesses allowed to give private testimonies? I am now attempting to use MediaCodec as an encoder. // Check for output from the decoder. There is some cost for the IPC transaction, but I expect that most of what you're seeing is the effect of the call blocking to maintain a steady 16.7ms per frame. Position where neither player can force an *exact* outcome, Is it possible for SQL Server to grant more memory to a query than is available to the instance. It suppresses B frames. by Why are standard frequentist hypotheses so uninteresting? // decoders to use a "mundane" format, so we just give a pass on proprietary formats. Thanks a lot for the explanation, I've just tried to specify a profile level that you mentioned above but unfortunately it didn't help me, I also tried to use a regular base and main profiles but got the same result - the latency didn't change. 640x480, but this "solution" doesn't suit me because I want to encode/decode a realtime video with 1920x1080 resolution. 504), Mobile app infrastructure being decommissioned. The MediaCodec encoder's consumer is in the mediaserver process, though the asynchronicity is better concealed. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. To review, open the file in an editor that reveals hidden Unicode characters. * which we must carefully forward to the decoder. Stack Overflow for Teams is moving to its own domain! Can a black pudding corrode a leather tunic? I measured a total time of encoding and decoding processes and it keeps around 50-65 milliseconds so I think the problem isn't in them. It suppresses B frames. Solution 1: I found this example very useful, thanks wobbals! I already experimented with different timeouts, bitrates, resolutions and other configuration options, to no avail. All input data seems to be valid (from camera). 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As for decoding you can create some surface in your UI and pass it to decoder using configure() it will allow the decoder to render a decoded frame into the surface so you won't need to copy decoded data from output buffers of decoder the only thing you should do is to pass Try using the Constrained Baseline Profile setting. This parameter represents the recording time of your frame and needs therefore to increase by the number of us between the frame that you want to encode and the previous frame. * with our frames, so we just check to see if it looks like more or less the right thing. // largest color component delta seen (i.e. mCamera.setPreviewCallback (new Camera.PreviewCallback () { private long timestamp=0; @Override public void . Data is encoded from, * a series of byte[] buffers and decoded into ByteBuffers. One thing to bear in mind is that the decoded video frames aren't . By, // doing this on every loop we're working to ensure that the encoder always has, // We don't really want a timeout here, but sometimes there's a delay opening. setup data used to initialize the codec such as PPS/SPS in the case of AVC video or code tables in the case of vorbis audio. Yes to send the output of a decoder directly into an encoder, first create the encoder's Surface with createInputSurface (), then hand it to the decoder when configuring it. // The first buffer of data we get will have the BUFFER_FLAG_CODEC_CONFIG. I've only extracted a Surface from a SurfaceView and I don't see, from the docs, how to do this in reverse. This sounds more like a problem with the way data is being fed into the decoder, e.g. // these are the formats we know how to handle for this test, * Returns true if the specified color format is semi-planar YUV. Find centralized, trusted content and collaborate around the technologies you use most. A planet you can take off from, but never land back. How to search and filter on an array in Ionic v5? // our desired properties. This is an example project to show how to streaming from android camera to VLC or gstreamer. However I could decrease the delay some frames by querying for the output some more times. Encoder will directly grab the the input data from surface. You can render those to the SurfaceView and the encoder's input Surface. On the other hand, this sequence without B frames allows coding and decoding the frames in order. use MdieCodec. We can't know exactly what the video encoder has done. * Checks the frame for correctness. ), * Generates data for frame N into the supplied buffer. How to under stande this? A tag already exists with the provided branch name. @fadden, I was studying sources from this link but decided that my approach is also not completely wrong (not completely, because it works on very first frame and no others). There is no way to take the encoder's input Surface and use it as the SurfaceView's display Surface -- they're two different pipelines. rendered The CTS tests like EncodeDecodeTest exercise three resolutions: QCIF (176x144), QVGA (320x240), and 720p (1280x720). It's designed for low latency and low power use. To review, open the file in an editor that reveals hidden Unicode characters. Which means you're stuck doing things the hard way. The code underlying Surface (called BufferQueue) should be capable (as of Lollipop) of multiplexing, but I'm not aware of an API in Lollipop that exposes the capability to applications. Application. As you surmised, just pass the encoder's input Surface to the decoder. Is it possible for SQL Server to grant more memory to a query than is available to the instance. I've tried to change h264 profiles, increase and decrease I-frame inteval, bitrate, framerate, but result the same, the only thing that hepls a little to reduce the latency - downgrade the resolution from 1920x1080 to e.g. 503), Fighting to balance identity and anonymity on the web(3) (Ep. testEncodeDecodeVideoFromSurfaceToSurfaceQCIF, testEncodeDecodeVideoFromSurfaceToSurfaceQVGA, testEncodeDecodeVideoFromSurfaceToSurface720p, /** Wraps testEncodeDecodeVideoFromSurfaceToSurface() */.
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