Aiseesoft iPhone 4S Movie Converter is the best and amazing video converter for iPhone 4S which is able to convert all popular video(3GP 3G2 AVI DV DIF FLV SWF F4V MOD MJPG MJPEG MKV MPG MPEG MPEG-2 VOB DAT MP4 M4V MPV QT MOV RM RMVB TOD TS TRP TP WMV ASF HD video) and audio(AAC AIF AIFF CUE FLAC M4A MP3 MP2 APE OGG AC3 RA RAM AU WAV WMA) files to iPhone 4S H.264MPEG-4 AVC H.264 M4V MPEG-4 MOV MPEG-4 H.264 HD video and AAC AIFF M4A MP3 WAV audio formats.Key Features1. Adjust output iPhone 4S effect This iPhone 4S Video Converter allows users to adjust video brightness saturation contrast hue and volume.2. Trim video length If you want to convert a specified video segment this software can assist you to trim any video segment and convert it to the iPhone 4S video.3. Crop video frame and watermark video You can crop video frame by cutting off video playing area and add textimage watermark to your video.4. Join videos together You can input several video files to the software and join them together with the Merge feature. Then you can get a single output video file.5. Define output parameters This iPhone 4S Movie Converter allows you to adjust Video Encoder Frame Rate Video Bitrate Resolution Audio Encoder Sample Rate Channels Audio Bitrate and so on.6. Choose audio track and subtitle This iPhone 4S Video Converter will display all audio tracks and subtitles for you to choose.7. Preview video effect This is a built-in player which allows users to preview the video effect. During the process you can also capture you favorite images and save them as images.8. Super high converting speed This software have adopted the NVIDIA CUDA and AMD APP technology which can make full use of your GPU to speed up the converting process.