mp4和3gp格式的区别

MP4可以包括这些内容

Video: (also known as H.264 and MPEG-4 AVC), , , and .

Audio: (also known as MPEG-2 Part 7), , (also known as MPEG-1 Audio Layer 3), , (also known as MPEG-1 Audio Layer 2), Audio Layer 1, (speech), (very low bitrates), SAOL (MIDI).

Subtitles: (also known as 3GPP Timed Text).

3GP

3GP is a simplified version of the (MP4) container format, designed to decrease storage and bandwidth requirements in order to accommodate . It stores video streams as or or , and audio streams as , , , or . A 3GP file is always , storing and transferring the most significant bytes first. It also contains descriptions of image sizes and bitrate.