How to combine FLV files into one?

Part 1: What is FLV?

The developing times sees that many videos and podcast websites spread through the Internet. FLV, the video format which has ever been fast-growing and widely used, can be easily input into Flash under copyright protection.

In the past years, FLV was supported by many websites, such as YouTube, Tudou and Sina Video, because it was occupied with small size, low CPU share, well-qualified playback effect and abundant resource.

However, in 2011, Adobe announced that it stopped developing Flash Player beyond PC and it would concentrate on HTML5, which affected the use of FLV files. The following table tells you the comparison between Flash Player and HTML5 Player.

Part 2: How to Combine FLV Files?

FLV (also known as Flash Video), comes along with the emergence of Flash MX. Do you know how to combine FLV files?

Use Renee Video Editor Pro to Combine FLV Files

Renee Video Editor Pro can detect the selected videos and take priority to lossless cut if permitted.

If the resolutions or the formats are not identical, Renee Video Editor Pro can recode the videos but greatly ensure the quality. Users will feel free because they don’t’ need to use the complex coding tool to reset the video parameters.

1. Open Renee Video Editor Pro and click [Video Toolbox].

2. Click [Add Files] to select the target videos. Click the button [No transition] if you want to have a natural transition between the videos.

3. Hundreds of transition effects are available in this software.

4. Finally, confirm the output format and the folder. Click [Start] to save and output the combined FLV file.

Use AVS Video Converter to Combine FLV Files

1. Open AVS Video Converter. Click [Browse] to select the target FLV files and set the output file name and the profile.

2. Click [Convert Now] to combine the FLV files into one.

Comparison between Renee Video Editor Pro and AVS Video Converter

Part 3: About Combining FLV Files

FLV is originally developed by Macromedia, which shares the same audio and video coding mode with SWF. Do you know more about combing FLV files?

Difference between Lossless Combination and Lossy Combination

Lossless combination: It means that a video is edited directly. This way will not degrade the audio or video quality because it skips the process of recoding.

Lossy combination: It means that a video is encoded again and then edited. Generally, the coding way is lossy compression in a video. If the video is encoded again, the audio and video quality will be degraded.

Any Problem in Lossy Combination?

If videos are recoded and combined (namely lossy combination) once to twice, the video quality will not be damaged too much. Yet, if you repeat this process many times, the video quality will be degraded severely.

Take a JPEG photo as an example. If you recode a JPEG photo repeatedly, it will become blur, with colors distorted.

Original photo

Repeat editing 200 times

Repeat editing 600 times

Why Black Bars Appear in Combined Video?

If the proportions of videos are not identical, black bars will appear in the combined video. For example, if you change the original video from 1280*720 (16:9) to 720*480 (3:2), the black bars will be seen on the output video because of the screen proportion difference.

Want to know how to remove black bars? Go and see here!