h.264

问题 I've been interested in this demo: http://jakearchibald.com/scratch/alphavid/ I also saw this question on here: Can I have a video with transparent background using HTML5 video tag? But I can't seem to figure out: How do you create h264, ogg and webm video files with alpha channels? 回答1: If you open this video from your demo with QuickTime you will see a video with separate RGB and A regions: If you then look at the code for the demo, you will see that it is using one offscreen HTML5 Canvas

问题 In order to add NAL headers to a raw H264 stream, what do I need to do? Ultimately, I want to take the video file and mux it with an audio file. 2 related questions: 1.) I've looked at this post: H.264 conversion with FFmpeg (from a RTP stream) However, when I look at the first two bytes of each frame, I'm seeing 0 and 0 for any frame I record, which doesn't say anything about the NAL contents. Am I looking at the right place? Is there another way I can create and write in NAL headers to a

问题 My goal is to split a XDCAM or a H264 video, frame-accurately, with ffmpeg. I guess that the problem comes from its long GOP structure, but I'm looking for a way to split the video without re-encoding it. I apply an offset to encode only a specific section of the video (let say from the 10th second to the end of the media) Any ideas ? 回答1: Please refer to the ffmpeg documentation. You will find an option -frames . That option can be use to specify for a given input stream (in the following

问题 I am trying to write PCMU G.711 enocded data into avi multimedia container using below program which yields Error occurred when opening output file: Operation not permitted and when using mov container, it yields Error occurred when opening output file: Invalid argument . I set AV_CODEC_ID_PCM_U16LE as audio codec of output format and AV_SAMPLE_FMT_S16 as sample format. What's the problem here? Thanks in advance! 回答1: You're writing AV_CODEC_ID_PCM_U16LE, which isn't G711, but raw PCM

问题 I am trying to play a .h264 file on my website(A file with .h264 suffix, not .mp4!) Is there any way I can do this? The html tag doesn't seem to support it. The website is running on a Raspberry pi, and it impossible to convert them automatically to mp4, because it will crash the backend. The videos are generated by a camera mounted on the raspberry pi. html: % if loaded_video is not None: <video width="720" height="480" controls> <source src="/movies/{{loaded_video.name}}" type="video/mp4" /

问题 According to RFC 6184: Annex B of H.264 defines an encapsulation process to transmit such NALUs over bytestream-oriented networks. In the scope of this memo, Annex B is not relevant. I see a lot of examplex, including in RFC6236, of SPS/PPS like this a=fmtp:99 packetization-mode=0;profile-level-id=42e011; \ sprop-parameter-sets=Z0LgC5ZUCg/I,aM4BrFSAa However, according to H.264, Annex B, there should be no comma, and a preamble must be added to the beginning of both SPS and PPS (and after

问题 I have an HTC Desire (Android 2.3.3, API level 9). I am trying to write a program to record 320x240 h.263 video. Without any settings, the code works well and the output resolution is 177x144. But it always crashes when I set the video size. And I find that only android 3.0+ support encoding h.264, I want to know how to do that on android 2.1+? I would be grateful for a solution to either issue. Here is what I am doing and the log recorder = new MediaRecorder(); recorder.setAudioSource

问题 I have captured video frame from multi media device. Captured stream has two slice packets. For testing a use case I need to convert it to transport stream with one slice packet. Any suggestions/pointers? 回答1: One slice is default on all h264 encoders I know of. Use ‘ffmpeg -i file.ts our -codec libx264 outfile.ts’ 来源： https://stackoverflow.com/questions/58106400/how-to-convert-captured-video-stream-with-two-slice-packet-to-transport-stream-w

问题 I embedded a video in the following URL: https://www.speurtochten.nl/over-ons/ I made it with Premiere Pro CC, exported it as H.264. The code I use in WordPress: [video src="https://speurtochten.nl/sbsfilm.mp4"][/video] I tried uploading several dummy videos instead (http://www.sample-videos.com/video/mp4/720/big_buck_bunny_720p_1mb.mp4), and they worked perfectly fine on the desktop AND on a mobile phone. On my iPhone, I get "Error loading this resource". 回答1: Accepting and agreeing with the

问题 I have put the code here I am streaming device using c code and receiving image frame using below method but when i record that frame as video if i record 20 second video then its showing me 2-3 second only can anyone help me please!! var recordingStatus : Bool = false var captureStatus : Bool = false var recordStatus : Bool = false var frameQueue = Queue<UIImage>() var frameCount : Int32 = 0 var mediaFilePath : String = "" /** * Invoke by native engine * Callback the frame data. * @param buf