AML Power Video Converter 5.2 - User Guide and FAQ

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Frequently Asked Questions - AML Power Video Converter

1. What is bitrate?
   Bit rate very often used when speaking of video or audio quality and file size - defines how much physical space one second of audio or video takes in bits (note: not in bytes). The higher the bit rate, the more times per second the original sound is sampled, thus yielding a more faithful reproduction and better sound. When choosing an MP3, weigh the advantage of a higher bit rate against the size of the file. Generally speaking, a bit rate of 128 kbps or higher will provide satisfactory sound quality.
   
   The same is with the video picture: the higher the bit rate, the better the picture quality although the output video file size also gets larger. If it is possible to save the output file onto a storage with a large capacity the use of higher video bit rates can be recommended.
   
   Selecting the proper audio and video bit rate for your projects depends on the playback target: if you're making a VCD for playback on a DVD player, the video must be exactly 1150 Kbps and the audio 224 Kbps.
   
   
2. What is frame rate?
   In basic terms, a video can be thought of as being made up of numerous snapshots, called frames. Frame Rate defines how many pictures e.g.. frames one second of video or audio contains, normally used acronym for framerate is fps - frames per second. Human eye can't see picture changes after the framerate is more than ~24fps.
   
   Video files with higher frame rates show motion better but have larger file sizes. Typical frame rates are 29.97 for NTSC video (in American TV system), 25 for PAL (European system) video, and 24 for film. When exporting low-bandwidth versions, select a frame rate that is 1/2, 1/3, or 1/4 of the original frame rate. Setting a frame rate higher than the original frame rate will make the file larger but will not improve the quality.
   
   Note that MPEG format only supports 23.976, 24, 25, 29.97, 30 frame rates.