mp3

Why do MP3 files use Synchsafe Integers?

由 六月ゝ 毕业季﹏ 提交于 2020-01-20 03:25:25
问题 I started reading mp3-files in c++. All went well until I read the specs of the ID3-Tag. There is some information in the ID3v2-Header about its size stored in so-called Synchsafe Integers. That is a four-byte integer where the most significant bit of each byte is set to zero. I found out how to convert it to an ordinary integer, but I cannot stop asking myself why an integer value is stored in such an unnecessarily complicated way. I hope there is someone who can tell me why it is stored

jQuery---音乐导航

由 本小妞迷上赌 提交于 2020-01-17 19:14:54
音乐导航 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <style> * { margin: 0; padding: 0; list-style: none; } .nav { width: 900px; height: 60px; background-color: rgb(231, 234, 237); margin: 0 auto; } .nav li { width: 100px; height: 60px; /*border: 1px solid yellow;*/ float: left; position: relative; overflow: hidden; } .nav a { position: absolute; width: 100%; height: 100%; font-size: 24px; color: rgb(60, 64, 67); text-align: center; line-height: 60px; text-decoration: none; z-index: 2; } .nav span { position: absolute; width: 100%; height: 100%; background

c# extract mp3 file from mp4 file

由 混江龙づ霸主 提交于 2020-01-17 12:24:27
问题 is there any easy way of extracting a mp3 file from a mp4 file? I've already tried to change the file extension, but that won't let me to edit the mp3 description. thank you! 回答1: Use Xabe.FFmpeg. It's free (non-commercial use), has public repository on GitHub, cross-platform (written in .NET Standard). Extracting mp3 from mp4 just by 3 lines: string output = Path.ChangeExtension(Path.GetTempFileName(), FileExtensions.Mp3); IConversionResult result = await Conversion.ExtractAudio(Resources

c# extract mp3 file from mp4 file

由 |▌冷眼眸甩不掉的悲伤 提交于 2020-01-17 12:23:38
问题 is there any easy way of extracting a mp3 file from a mp4 file? I've already tried to change the file extension, but that won't let me to edit the mp3 description. thank you! 回答1: Use Xabe.FFmpeg. It's free (non-commercial use), has public repository on GitHub, cross-platform (written in .NET Standard). Extracting mp3 from mp4 just by 3 lines: string output = Path.ChangeExtension(Path.GetTempFileName(), FileExtensions.Mp3); IConversionResult result = await Conversion.ExtractAudio(Resources

FFmpeg 命令学习

由 孤街浪徒 提交于 2020-01-16 05:49:59
When -ss and -t are placed after the input, ffmpeg counts demuxed packets. This will be accurate. 从视频开始，截取10秒的长度： ffmpeg -t 0:0:10 -i extern.mp4 -vcodec copy -acodec copy output.mp4 从视频的2分30秒开始，截取20秒： -ss 开始时间，如： 00:00:20，表示从20秒开始； -t 时长，如： 00:00:10，表示截取10秒长的视频； -i 输入，后面是空格，紧跟着就是输入视频文件； -vcodec copy 和 -acodec copy表示所要使用的视频和音频的编码格式，这里指定为copy表示原样拷贝； INPUT，输入视频文件； OUTPUT，输出视频文件； ffmpeg -ss 0:2:30 -t 0:0:20 -i input.mp4 -vcodec copy -acodec copy output.mp4 截取视频21分–58分之间的片段 ffmpeg -i WebViewJavascriptBridge.mp4 -vcodec copy -acodec copy -ss 00:21:00 -to 00:58:13 1.mp4 -y 注意: ss,t,to的位置。

How to play MP3 From URL in iOS

由 大城市里の小女人 提交于 2020-01-16 04:05:31
问题 This question seem to duplicate with many questions. I have followed many answer in those questions already but non of them working for me. So I decided to ask this question again if you an help me. I have a URL that I get from a webview [[[webview request]URL]absoluteString]; and here is my code to play the MP3 file from URL: // properties @property (strong,nonatomic) AVPlayerItem *playerItem; @property (strong,nonatomic) AVPlayer *player; // coding NSString *decoded = (__bridge_transfer

Combine an unknown number of .mp3 files

由 跟風遠走 提交于 2020-01-15 09:18:32
问题 I have this: $number = 1; $mp3 = file_get_contents("http://example.com/text=".$value); $file = md5($value)."-".$number.".mp3"; file_put_contents($file, $mp3); $number++; Result: create abcdef-1.mp3 , abcdef-2.mp3 , abcdef-3.mp3 . Now I want to combine abcdef-1.mp3 with abcdef-2.mp3 and abcdef-3.mp3 . This works: file_put_contents('abcdef.mp3', file_get_contents('abcdef-1.mp3') . file_get_contents('abcdef-2.mp3') . file_get_contents('abcdef-3.mp3')); But is not suitable for my code, because

Combine an unknown number of .mp3 files

由 二次信任 提交于 2020-01-15 09:17:06
问题 I have this: $number = 1; $mp3 = file_get_contents("http://example.com/text=".$value); $file = md5($value)."-".$number.".mp3"; file_put_contents($file, $mp3); $number++; Result: create abcdef-1.mp3 , abcdef-2.mp3 , abcdef-3.mp3 . Now I want to combine abcdef-1.mp3 with abcdef-2.mp3 and abcdef-3.mp3 . This works: file_put_contents('abcdef.mp3', file_get_contents('abcdef-1.mp3') . file_get_contents('abcdef-2.mp3') . file_get_contents('abcdef-3.mp3')); But is not suitable for my code, because

Unable to merge two mp3 files

由 可紊 提交于 2020-01-15 08:18:08
问题 public class MainActivity extends Activity { FileInputStream fistream2,fistream1; File newFile=new File(Environment.getExternalStorageDirectory() +File.separator +"newfolder" //folder name +File.separator +"media" +File.separator +"player"+File.separator+"theonkar10.mp3"); File newFile1=new File(Environment.getExternalStorageDirectory() +File.separator +"newfolder" //folder name +File.separator +"media" +File.separator +"player"+File.separator+"1.mp3"); File newFile2=new File(Environment

youtube-mp3.org api not working properly, only downloads cached videos

由 无人久伴 提交于 2020-01-14 06:40:08
问题 Previously i was able to download YouTube videos as mp3 via youtube-mp3.org Using this method: http://www.youtube-mp3.org/api/pushItem/?item=http%3A//www.youtube.com/watch%3Fv%3D<VIDEOID>&xy=_ Then it returned the video id and they started converting the video on their servers. Then this request would return a JSON string with info about the video and the current conversion status: http://www.youtube-mp3.org/api/itemInfo/?video_id=<VIDEOID>&adloc= After repeating the request until the value
订阅 mp3