audio

How to append 2 seconds of silence to an existing movie MP4 with ffmpeg?

由 ◇◆丶佛笑我妖孽 提交于 2020-03-25 13:41:59
问题 I would like to append 2 seconds of silence to an existing video using ffmpeg. I would like to keep the last frame displayed while the 2 seconds of video playsback not a black screen. Thank you. 回答1: Use the tpad and apad filters: ffmpeg -i input.mp4 -filter_complex "[0:v]tpad=stop_mode=clone:stop_duration=2[v];[0:a]apad=pad_dur=2[a]" -map "[v]" -map "[a]" output.mp4 A faster, but less compatible method is to stream copy the video and use the apad filter if your player and output container

IBM Watson Speech-to-Text “unable to transcode data stream audio/webm -> audio/x-float-array” media MIME types

由 拜拜、爱过 提交于 2020-03-25 12:30:42
问题 I'm recording short audio files (a few seconds) in Chrome using mediaDevices.getUserMedia() , saving the file to Firebase Storage, and then trying to send the files to IBM Watson Speech-to-Text. I'm getting back this error message: unable to transcode data stream audio/webm -> audio/x-float-array In the browser I set up the microphone: navigator.mediaDevices.getUserMedia({ audio: true, video: false }) .then(stream => { var options = { audioBitsPerSecond : 128000, mimeType : 'audio/webm' };

Tkinter start/stop button for recording audio in Python

由 风流意气都作罢 提交于 2020-03-23 15:40:21
问题 I am writing a program to record audio with the use of a Tkinter GUI. For recording audio itself, I use this code: https://gist.github.com/sloria/5693955 in nonblocking mode. Now I want to implement something like a start/stop button, but feel like I am missing out on something. Following suppositions: I can't use a while True statement either a time.sleep() function because it's going to break the Tkinter mainloop() As a result, I will probably have to use a global bool to check whether my

Response.ContentType的所有類型

由 浪尽此生 提交于 2020-03-22 10:41:57
'ez' => 'application/andrew-inset', 'hqx' => 'application/mac-binhex40', 'cpt' => 'application/mac-compactpro', 'doc' => 'application/msword', 'bin' => 'application/octet-stream', 'dms' => 'application/octet-stream', 'lha' => 'application/octet-stream', 'lzh' => 'application/octet-stream', 'exe' => 'application/octet-stream', 'class' => 'application/octet-stream', 'so' => 'application/octet-stream', 'dll' => 'application/octet-stream', 'oda' => 'application/oda', 'pdf' => 'application/pdf', 'ai' => 'application/postscript', 'eps' => 'application/postscript', 'ps' => 'application/postscript',

Response.ContentType的所有类型

由 无人久伴 提交于 2020-03-22 10:40:01
$mimetypes = array( 'ez' => 'application/andrew-inset', 'hqx' => 'application/mac-binhex40', 'cpt' => 'application/mac-compactpro', 'doc' => 'application/msword', 'bin' => 'application/octet-stream', 'dms' => 'application/octet-stream', 'lha' => 'application/octet-stream', 'lzh' => 'application/octet-stream', 'exe' => 'application/octet-stream', 'class' => 'application/octet-stream', 'so' => 'application/octet-stream', 'dll' => 'application/octet-stream', 'oda' => 'application/oda', 'pdf' => 'application/pdf', 'ai' => 'application/postscript', 'eps' => 'application/postscript', 'ps' =>

header Content-Type类型

由 被刻印的时光 ゝ 提交于 2020-03-22 10:26:44
简介：这是header Content-Type类型的详细页面，介绍了和php,有关的知识、技巧、经验，和一些php源码等。 class='pingjiaF' frameborder='0' src='http://biancheng.dnbcw.info/pingjia.php?id=339657' scrolling='no'> <? php $mimetypes = array( 'ez' => 'application/andrew-inset', 'hqx' => 'application/mac-binhex40', 'cpt' => 'application/mac-compactpro', 'doc' => 'application/msword', 'bin' => 'application/octet-stream', 'dms' => 'application/octet-stream', 'lha' => 'application/octet-stream', 'lzh' => 'application/octet-stream', 'exe' => 'application/octet-stream', 'class' => 'application/octet-stream', 'so' => 'application/octet-stream',

WebRTC iOS Audio Chat

由 ＊爱你＆永不变心＊ 提交于 2020-03-22 08:09:11
问题 I am creating a voice only (no video) chat application. I have created my own node.js/socket.io based server for signaling. For WebRTC, I am using the following pod: https://cocoapods.org/pods/WebRTC I have been successful in creating peer connection, adding local stream, setting local/remote sdp, and send/receive ice candidates. The "didAddStream" delegate method is also called successfully having audio tracks but I am stuck here. I don't know what should I do with the audio track. What

多个语音 audio，播放互斥

由 生来就可爱ヽ(ⅴ＜●) 提交于 2020-03-21 21:36:21
<template> <div class="soundWrap"> <div :key='item' v-for="(item, key) in vocabulary"> <audio class="audio" @error="onError" :key='item' :src="item.audio"></audio> <div class="soundloading" v-if="soundloading"> <img src="../static/img/soundloading.png"> </div> <div class="soundplay" v-else @click="startPlay(key, item.audio)" :class="(voice && index === key) ? 'voiceshow' : '' "></div> </div> </div> </template> <script type="text/javascript"> export default { data () { return { soundloading: false, voice: false, index: null } }, methods: { // 播放完当前才可播放下一个 startPlay (key, src) { this.index = key

In Shiny R, is there a way to run an observeEvent right after an observeEvent with no delay (issue with renderUI)?

由 ◇◆丶佛笑我妖孽 提交于 2020-03-20 21:13:47
问题 Ok my title is a little bit confusing but let me explain. I am using renderUI to get an audio tag, however, I want to start the audio at a lower volume because it is simply too loud. The code below works fine, except because I added the delay it starts off at a higher volume and quickly goes to the lower volume but it is still very noticeable. Lowering the delay does not help, I've tried. If I remove the delay, the two observeEvents will run simultaneously and the volume will not be changed.
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