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实现纯前端下的音频剪辑处理

 ̄綄美尐妖づ 提交于 2019-11-30 17:56:54
原文: https://juejin.im/post/5d91c2d85188251662293adb 前言 最近在做一个项目,需要对webRTC录制的音频进行处理,包括音频的裁剪、多音频合并,甚至要将某个音频的某一部分替换成另一个音频。 原本笔者打算将这件工作交给服务端去完成,但考虑,其实无论是前端还是后台,所做的工作是差不多的,而且交给服务端还需要再额外走一个上传、下载音频的流程,这不仅增添了服务端的压力,而且还有网络流量的开销,于是萌生出一个想法:为什么音频处理这件事不能让前端来做呢? 于是在笔者的半摸索半实践下,产生出了这篇文章。废话少说,先上 仓库地址 ,这是一个开箱即用的前端音频剪辑sdk(点进去了不如就star一下吧) ffmpeg ffmpeg 是实现前端音频处理的非常核心的模块,当然,不仅是前端,ffmpge作为一个提供了录制、转换以及流化音视频的业界成熟完整解决方案,它也应用在服务端、APP应用等多种场景下。关于ffmpeg的介绍,大家自行google即可,这里不说太多。 由于ffmpeg在处理过程中需要大量的计算,直接放在前端页面上去运行是不可能的,因为我们需要单独开个web worker,让它自己在worker里面运行,而不至于阻塞页面交互。 可喜的是,万能的github上已经有开发者提供了 ffmpge.js ,并且提供worker版本,可以拿来直接使用。

Element-ui组件库Table表格导出Excel表格

瘦欲@ 提交于 2019-11-30 17:34:37
点击“点击导出”按钮后下载sheetjs.xlsx文件(导出文件) Element组件库中的el-table表格导出需要的主要是两个依赖:(xlsx 和 file-saver) npm install --save xlsx file-saver <template> <div class="table"> <!--给表格添加一个id,导出文件事件需要使用--> <el-table :data="tableData" border style="width: 100%" id="out-table" > <el-table-column prop="date" label="日期" width="180" > </el-table-column> <el-table-column prop="name" label="姓名" width="180" > </el-table-column> <el-table-column prop="address" label="地址" > </el-table-column> </el-table> <!--给按钮绑定事件--> <button @click="exportExcel">点击导出</button> </div> </template> <script> // 引入导出Excel表格依赖 import FileSaver

How to specify null value in MS Access through the JDBC-ODBC bridge?

别说谁变了你拦得住时间么 提交于 2019-11-30 17:27:52
问题 I am not able to call setNull on PreparedStatement using MS Access (sun.jdbc.odbc.JdbcOdbcDriver) preparedStatement.setNull(index, sqltype). Is there a workaround for this? For LONGBINARY data type, I tried the following calls, neither worked. setNull(index, java.sql.Types.VARBINARY) setNull(index, java.sql.Types.BINARY) java.sql.SQLException: [Microsoft][ODBC Microsoft Access Driver]Invalid SQL data type at sun.jdbc.odbc.JdbcOdbc.createSQLException(JdbcOdbc.java:6957) at sun.jdbc.odbc

Replacing text in a BLOB Column

落爺英雄遲暮 提交于 2019-11-30 16:51:46
In one of our tables we have a HUGEBLOB Column (Column name is DYNAMIC_DATA ) which holding an XML data. What I need to do is updating a certain part of the text from within this BLOB. I've tried this query: UPDATE ape1_item_version SET DYNAMIC_DATA = REPLACE (DYNAMIC_DATA,'Single period','Single period period set1') WHERE name = 'PRIT ALL POOL for Duration Telephony 10_NA_G_V_H_N_Z2' But I get the following error: ORA-00932: inconsistent datatypes: expected NUMBER got BLOB How can I execute REPLACE on the BLOB ? REPLACE works on the following datatypes: Both search_string and replacement

How to upload RecordRTC blob file to Rails paperclip in AJAX

若如初见. 提交于 2019-11-30 16:43:35
On the client side, the user uses RecordRTC to record a short video. When the user presses upload, I will get the video's blob data using recorder.getBlob() , and upload it to my server (using Rails and paperclip to handle file upload). At first, I wanted to change the <input type='file'> field value to the blob data. It turns out that for security in browsers, I cannot change it using javascript. Then, I tried to use AJAX: $("#ajax-submit").on("click", function() { var data = new FormData(); data.append("record[video]", recorder.getBlob(), (new Date()).getTime() + ".webm"); var oReq = new

How to upload RecordRTC blob file to Rails paperclip in AJAX

喜你入骨 提交于 2019-11-30 16:12:37
问题 On the client side, the user uses RecordRTC to record a short video. When the user presses upload, I will get the video's blob data using recorder.getBlob() , and upload it to my server (using Rails and paperclip to handle file upload). At first, I wanted to change the <input type='file'> field value to the blob data. It turns out that for security in browsers, I cannot change it using javascript. Then, I tried to use AJAX: $("#ajax-submit").on("click", function() { var data = new FormData();

To retrieve BLOB image from sqlite

本小妞迷上赌 提交于 2019-11-30 16:12:31
问题 The code for saving image: NSData *imageData=UIImagePNGRepresentation(animalImage); NSString *insertSQL=[NSString stringWithFormat:@"insert into AnimalsTable (name,propertyID,animalID,breed,mainBreed,dateofbirth,sex,notes,imageData) values(\"%@\",\"%@\",\"%@\",\"%@\",\"%@\",\"%@\",\"%@\",\"%@\",\"%@\")",nameString,propertyString,animalidString,breedString,mainBreedString,dateString,sexString,notesString,imageData]; sqlite3_stmt *addStatement; NSLog(@"%@",appDelegate.sqlFile); const char

To retrieve BLOB image from sqlite

半世苍凉 提交于 2019-11-30 16:08:19
The code for saving image: NSData *imageData=UIImagePNGRepresentation(animalImage); NSString *insertSQL=[NSString stringWithFormat:@"insert into AnimalsTable (name,propertyID,animalID,breed,mainBreed,dateofbirth,sex,notes,imageData) values(\"%@\",\"%@\",\"%@\",\"%@\",\"%@\",\"%@\",\"%@\",\"%@\",\"%@\")",nameString,propertyString,animalidString,breedString,mainBreedString,dateString,sexString,notesString,imageData]; sqlite3_stmt *addStatement; NSLog(@"%@",appDelegate.sqlFile); const char *insert_stmt=[insertSQL UTF8String]; if (sqlite3_open([appDelegate.sqlFile UTF8String],&database)==SQLITE_OK

Replacing text in a BLOB Column

徘徊边缘 提交于 2019-11-30 16:08:13
问题 In one of our tables we have a HUGEBLOB Column (Column name is DYNAMIC_DATA ) which holding an XML data. What I need to do is updating a certain part of the text from within this BLOB. I've tried this query: UPDATE ape1_item_version SET DYNAMIC_DATA = REPLACE (DYNAMIC_DATA,'Single period','Single period period set1') WHERE name = 'PRIT ALL POOL for Duration Telephony 10_NA_G_V_H_N_Z2' But I get the following error: ORA-00932: inconsistent datatypes: expected NUMBER got BLOB How can I execute

Large .PDF Files Not Uploading To MySQL Database as Medium BLOB Via PHP, Files under 2MB Work Fine

限于喜欢 提交于 2019-11-30 15:49:22
I am developing a PHP script for uploading .PDF documents as medium BLOBs into a MySQL database via PHP. The script also allows users to search for files and open/download them but I do not think that part of the script is relevant to my issue. The script works fine with files less than 2 MB but as soon as I try and upload a file that is more than 2 MB nothing is going into my content(Medium BLOB) column and there is no value for the mime type. I have already tried increasing the max_packet_size for the MySQL server to 4 MB from its default value of 1 MB. I have also updated php.ini to the