mp4

问题 Does Firefox 8 (win/64) Support mp4? I cannot find any mention on MDN of support for mp4 AND it's not playing mp4 files locally on server. Please advise. sleeper 回答1: Firefox does not support the mp3/mp4 technologies, as aspects of them are licensed. See the 'official' support list for Firefox here: https://developer.mozilla.org/En/Media_formats_supported_by_the_audio_and_video_elements More about why Firefox avoids it: http://en.wikipedia.org/wiki/MP3#Licensing_and_patent_issues 来源： https:/

问题 I'm trying to play some .m4a files, and I understand that JAAD only supports decoding AAC, but there are songs that I am able to get the sourceDataLine from, and then when I go to try to play them, I get behavior like this: We read: 1024 bytes. We read: 512 bytes. We read: -1 bytes. When running this: // read from the input bytesRead = audioInputStream.read(tempBuffer, 0, tempBuffer.length); System.out.println("We read: " + bytesRead + " bytes."); until bytesRead == -1 For this particular

问题 this is my first question on the forums. I'm building an app which implements a simple webview that loads an html5 page from the SD card. The app is a presentation made of 5 sections, and each section is contains some text overlayed on top of an HD video about 2 seconds long that plays in loop, basically acting like a page with a video background. The app runs fullscreen with automatic letterboxing / pillarboxing depending on the video resolution and orientation. On Chrome (Windows 7) and

问题 I'm using following library to convert mkv to mp4: https://github.com/SterlingOnLoop/FFmpegWrapper. - (void)convertUsingFFmpegWrapper { NSString *mp4Extension = @"mp4"; NSString *mkvExtension = @"mkv"; NSString *videoName = @"file1"; // NSString *videoName = @"file2"; NSString *mkvVideoFilePath = [[NSBundle mainBundle] pathForResource:videoName ofType:mkvExtension]; NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory =

问题 I'm trying to play a remote AAC file in ActionScript 3 in Flash CS3 and am currently using this code: var url:String = " http://a1.phobos.apple.com/us/r1000/020/Music/d4/50/94/mzm.kjjofihr.aac.p.m4a "; var connect_nc:NetConnection = new NetConnection(); connect_nc.connect(null); var stream_ns:NetStream = new NetStream(connect_nc); stream_ns.play(url); (This is based on: http://www.adobe.com/devnet/flashplayer/articles/hd_video_flash_player_03.html) No errors are thrown, but no sound is played

问题 I'm thinking about the fact that the higher the MP4 profile we go, the better the video quality gets... This brings me to a question I thought I'd ask the experts! Can a HTML 5 video tag have multiple MP4 sources with different codecs? Something like: <video> <source src="video.webm" type='video/webm; codecs="vp8, vorbis"' /> <source src="high.mp4" type='video/mp4; codecs="avc1.64001E, mp4a.40.2"' /> <source src="main.mp4" type='video/mp4; codecs="avc1.4D401E, mp4a.40.2"' /> <source src=

问题 I have the following specified with my MediaRecorder implementation: const getMediaRecorderOptions = function () { var options = { mimeType: "video/webm;codecs=vp8" }; // 9 was lagggy, cpu-intensive if (!MediaRecorder.isTypeSupported(options.mimeType)) { logger.recorderLog(options.mimeType + " is not Supported"); options = { mimeType: "video/webm;codecs=vp8" }; if (!MediaRecorder.isTypeSupported(options.mimeType)) { logger.recorderLog(options.mimeType + " is not Supported"); options = {

问题 I am having a wav file.How to convert wav file into mp4 file container format with AAC as audio stream using FFmpeg in android.I know how compile and port ffmpeg for android.Can anybody give me right direction thanks, 回答1: you'll need to compile libfaac if you want to have a decent quality encoder. Then, something like ffmpeg -i foo.wav -vn -acodec libfaac -ab BITRATE output.mp4 should do the trick. 来源： https://stackoverflow.com/questions/9942631/how-to-convert-wav-file-to-mp4-using-ffmpeg-in

问题 I've discovered that Microsoft Media Foundation generates MPEG4 file in which the MDAT atom comes before the MOOV atom. MOOV before MDAT is required for streaming. I assumed the solution to my problem would be to use the MF_MPEG4SINK_MOOV_BEFORE_MDAT attribute when creating the sink, but I can't seem to get it to have an effect. My code is largely the same as that http://blogs.msdn.com/b/eternalcoding/archive/2013/03/06/developing-a-winrt-component-to-create-a-video-file-using-media

问题 What I'm doing is on an IOS app with Xcode 7.3. I got h264 data from an ip camera using UDP,the data can be decoded and displayed rightly (decoded by ffmpeg). Now I want to mux the raw H264 data to an mp4 file(some users may want to record what they are watching on his cell-phone), using ffmpeg. Nothing wrong happened when the code is running, and the result file can be played normally with QuickTime on my computer. But when played on iphone with iphone's default video player, it can't be