An Optimized Workflow of Sound in v2.6
The new v2.6 SCREEN2SWF/SCREEN2EXE has optimized its workflow of sound to make the quality better when outputting SWF format. And, make it possible for future version to adding functions like ‘sound editing’.
The previous workflow of sound recording is,
You can see that when outputting SWF format, there are 2 compression operations. Each compression loss quality, so 2 processing loss double information. To improve that, in v2.6 we change it to,
So, the quality of sound in SWF format improved!
There is another issue we have to explain about sound in SWF. That is the sound in SWF have to be in MP3 (Mpeg Layer 3) coded. Because it is the only format that flash player supports. The MP3 format is designed for compress music, which have more high frequency information. But most sounds in a screen recording program are voice only. Then the MP3 need more bits to compress the high frequency data.
Currently, we use 8Kbps GSM coding in EXE and AVI format, which works great for voice sound. But we have to use MP3 which have at least 16Kbps (2-4 times than GSM) in SWF. That cause the size of SWF file may little bigger than a self-play EXE format. You can choose the quality of MP3 sound in v2.6, the flash set dialog to find the balance between size and quality.