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Extracting a Portion of Video using FFMPEG

If you would like to extract a portion of a video without re-encoding, consider using FFMPEG. The following example illustrates a command to extract a video from the 24th minute line and for 4 minutes 8 seconds, keeping all audio

Posted in Tips & Tricks

Setting the default audio stream using FFMPEG

Here is another use case for FFMPEG. In some projects, after you mixed and matched video and audio streams from different files, the resultant file may not have the default audio stream as desired. You can use the following command

Posted in Tips & Tricks

Changing resolution of a video using FFMPEG

Very often you would like to change the not-so-standard resolution of a video to some more common formats, e.g. 4:3 or 16:9. You can try using the following FFMPEG command to achieve this. ffmpeg -i video_1920.mp4 -vf scale=640:480,setdar=4:3 video_640x480.mp4 -hide_banner

Posted in Tips & Tricks

Replacing an Audio Stream using FFMPEG

This is another example of using FFMPEG to manipulate video and audio files. In this case, one would like to replace the second audio stream in a video file by another audio file. Here is the command you may want

Posted in Tips & Tricks

Add a new audio track to an existing file

There is yet another common use of FFMPEG, i.e. adding a new audio track to an existing file which can be a video-only file or a video file already with an audio track. A use case will be adding a

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Announcing: Windows Defender ATP support for Windows 7 and Windows 8.1

With Windows 10 we built the most secure Windows ever, by hardening the platform itself and by developing Windows Defender Advanced Threat Protection (ATP) – a unified endpoint security platform that helps stop breaches. This means that for the first

Posted in Technology News

Correcting for audio/video sync issues

Due to various reasons, the audio and video tracks sometimes may become out-of-sync in a video clip, i.e. there are some delay between the tracks affecting the overall viewing experience. Use the following as examples to fix the issue. CASE

Posted in Tips & Tricks

Rotate a Video without Loss of Quality

Very often videos shot by smart phones do not carry a proper orientation indicator as intended due to various reasons. In order to rotate these videos without re-encoding, try the following command. ffmpeg -i input.mp4 -c copy -metadata:s:v:0 rotate=90 output.mp4

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Flashing Firmware on Scishion V88 TV Box

To flash the firmware of Scishion V88 TV Box and V88 mini TV Box, both use Rockchip RK3229, there are basically two main methods. The first one is to prepare a microSD card with the desired firmware using a utility

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Swap the audio tracks without re-encoding

Many video file formats allow you to have multiple sound tracks (e.g. karaoke videos) where the first audio track is treated as the default by many audio-visual editing applications. Many of those can only handle one audio track which is

Posted in Tips & Tricks