Getting Rid of DTS/AC3 Audio using ffmpeg on Linux to Play MKV Files on iOS or Android

I encountered the problem on iPhone that MKV video files with AC3 are played with no sound. The OPlayer reports to me that “According to DTS patent, DTS is forbidden to play , None of the media player on iPhone/iPad can play DTS”. dts-ac3-on-mobile.png However, the video file can be played in MPlayer on Linux just well. Checking MPlayer’s output: ========================================================================== Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders [ac3 @ 0x7ff826946dc0]Channel layout '5.1(side)' with 6 channels does not match specified number of channels 2: ignoring specified channel layout AUDIO: 48000 Hz, 2 ch, floatle, 640.0 kbit/20.83% (ratio: 80000->384000) Selected audio codec: [ffac3] afm: ffmpeg (FFmpeg AC-3) ========================================================================== Here, “Selected audio codec: [ffac3] afm: ffmpeg (FFmpeg AC-3)” indicates that the audio is encoded in AC-3. » Read more

Changing iPhone Holiday Calendar to Your Local One

I usually use iPhone in the English language. However, I find the iPhone calendar app includes a US holiday calendar subscribed while I am not in US and displaying US holidays in the iPhone calendar is no use and kind of annoying to me. holiday-calendar-iphone-us.png After some investigation, I find the way to set the iPhone holiday calendar to the local or specific one. » Read more

Playing YouTube Video in Background on iPhone

This post introduces how to play YouTube video in background on your iPhone. With this tip, you will need not to keep the YouTube app opening all the time. So you can use other apps on iPhone while listening to the music or talk or others from YouTube. This tip should also work on other iOS devices such as iPad. To make YouTube videos play in background, you need to open YouTube in the browser instead of the YouTube app. » Read more

OpenVPN + Ovpn Spider: Free VPNs for iPhone Users

VPNs are useful for testing viewing webpages from a remote location or visiting blocked websites. In this post, I will introduce a method for finding and using free VPNs on iPhone. Note that the VPNs are free and the providers are not identified. Hence, only use this method for visiting public webpages or keeping visiting https sites. If security or privacy are important concerns, find a reliable VPN service or set up your own. » Read more

iPhone Connecting to Internet Using Windows PC’s Network through USB Cable

Note that this was only tested on certain combinations like this (Windows 7 with iOS 8), this (Windows 7 with iOS 7), this and this (Windows 7 with iOS 9.3.2 (iphone 6s)). Windows 7 seems a possible Windows OS that can work. Recently, I tested it on Windows 8 and iOS 9. Unfortunately, it did not work. It seems iOS or Windows has changed its way configuring the network. » Read more

Installing WhatsApp on iPod Touch

There was a post about installing WhatsApp on iPod Touch. However, the tech used is obsoleted. As many readers still reach here for some tips, I give two links to two posts that seem promising. But I never tested them as I do not have a new iPod touch any more. You may take a look at them for installing WhatsApp on iPod Touch. » Read more

Locking iPhone Screen Rotation

iPhone’s automatic screen rotation is convenient. However, it is annoying under some situation, such as reading email in the bed. Fortunately, starting from iOS 4/iOS 5, iOS has an option to lock the screen rotation. A screenshot on iPhone (which worths a thousands words): For iOS 7 and iOS 8 ∞ iphone-rotation.png For older versions of iOS ∞ It is a little tricky to find it out on older version of iOS. » Read more

Setting Up POP3/IMAP Email Box on Nokia E71

The software in Nokia E71 already support POP3 and IMAP email box. But we may lead to install Nokia messaging and setting up account of Nokia messaging. Storing our emails in remote servers isn’t a secure way. And why not use IMAP directly if it is supported by the system software? How to set up POP3 or IMAP email box on Nokia E71 will be introduced in this post. » Read more