codec

问题 I'm willing to migrate my code from mongojack to something that supports the new async mongo driver. Yet I find that the new way of encoding/decoding is through Codec s and I don't see myself writing a Codec for every class in my model. That's why I'd rather write a lib that given a class creates a Codec . However I don't know how, nor do I know if there's already some effort out there trying to achieve the same. Are there some libs that achieve what I want? if not, what's the best approach

问题 I want to have cef lib with support of mp3 and ffmpeg codecs. How can i re-compile the library of cef with these codec features inside it. I want to learn, where should I edit inside the cef library or cefsharp? Then how to compile it to reuse it.. I am using cefsharp version 47. 回答1: NOTE: PLEASE CONSIDER LEGAL ISSUES BEFORE PROCEEDING There is a way to enable MP3 support in CEF, but you'll have to modify the cef.gypi in the source distribution, regenerate the visual studio projects and

问题 If we wanted to make an HTTP/1.0 or HTTP/1.1 request, for example bytes 20000 to 100000 or seconds 20 through 35 seconds of a given media resource for example, .webm or .ogg audio or .mp4 video, where the response would be a discrete media fragment capable of playback without other portions of the media resource, how would we achieve this? For example let headers = new Headers(); let range = 1024 * 1024; headers.append("Range", "bytes=0-" + range); let request = new Request(url, {headers

问题 I am trying to find the codec used to compress a movie. I am sure if I need to somehow use CMFormatDescription and get a CMVideoCodecType key. I am stuck as to how to get past the metadata array. Any ideas on how to retrieve the codec? AVURLAsset* movieAsset = [AVURLAsset URLAssetWithURL:sourceMovieURL options:nil]; NSArray *tracks = [movieAsset tracksWithMediaType:AVMediaTypeVideo]; if ([tracks count] != 0) { AVAssetTrack *videoTrack = [tracks objectAtIndex:0]; // // Let's get the movie's

问题 We have an option to check the network connection types in Android (whether it is 3G, edge or gprs). I need to check the the bandwidth rate. I need to initiate a call. For that I need to check the bandwidth rate. Above a particular bandwidth only I need to make visible an option for a call (to initiate a call). I need to find the connection speed programmatically (connection speed for Mobile Data Link, EDGE). 回答1: You can download a known-size file from your server, and calculate how long did

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 I'm using VirtualDub and I want to digitalize a VHS movie frame by frame. But I need a codec which supports intra-frames. Do the following codecs supports intra-frame? If not where can I get or buy a codec with intra-frame? 回答1: From your current choices: Lagarith may be ok Xvid can be set to intra mode but this is somewhat pointless. There is a lot of better free codecs. utvideo and magicyuv are excellent lossless intra codecs. cineform is very good lossy intra codec but somewhat more

问题 Im trying to get a HTML page set up where a video is playing. My video is an .mkv file. It works fine on Chrome, but I dont have any sound. Audio codec is AC3. My code: <p><video src="video.mkv" type='video/x-matroska; codecs="a_ac3, avc"' autoplay controls onerror="failed(event)" ></video></p> https://jsfiddle.net/wc2fn02s/ 回答1: AC3 is not supported by Chrome due to licensing issues. No support for ac3 and dts - Current status: WontFix Media player silently ignores AC3 audio (pun intended).

问题 I have trouble in Python, when reading special national characters from a text file. with open("../Data/DKsnak.txt") as f: content = f.readlines() str1 = content[0] print "string:",str1 lst1 = str1.split() print "list:",lst1 The output is a follow: string: Udtræk fra observatør på årstal list: ['Udtr\xc3\xa6k', 'fra', 'observat\xc3\xb8r', 'p\xc3\xa5', '\xc3\xa5rstal'] The first line is as expected, including special Danish charcters. But they don't survive being split into a string. I have

问题 I have received parsed h264 data from my phone, and I am trying to extract frames from the data. I used the following ffmpeg command lines: ffmpeg -i temp.h264 -ss 5 -pix_fmt yuv420p -vframes 1 foo.yuv ffmpeg -s 1280:720 -pix_fmt yuv420p -i foo.yuv output.jpg This results in the right output image on Ubuntu (KDE neon User Edition 5.12) with ffmpeg version 2.8.14. However, it does not work on macOS High Sierra (10.13.4) with ffmpeg version 4.0 and instead shows an output message: Output file