doom9上的MP4 FAQ, 应该能解决lz的一些疑问 lol
What is MP4? I have heard it is a "container format"? What's that?
A container format allows you to combine different multimedia streams (most of the time audio and video) into one single file.
Multimedia containers are for example the well known AVI (.avi), MPEG (.mpg, .mpeg), Matroska (.mkv, .mka), OGM (.ogm), Quicktime (.mov) or Realmedia (.rm, .rmvb)
MP4 is the global file extension for the official container format defined in the MPEG-4 standard (ISO 14496-14)
MP4 is streamable and supports all kinds of multimedia content (multiple audio-, video-, subtitlestreams, pictures, variable-framerates, -bitrates, -samplerates...) and advanced content (officially called "Rich Media" or "BIFS") like 2D and 3D animated graphics, user interactivity, DVD-like menus... - next to nothing handled by the often used AVI
How can i create spec compliant MP4 files?
easy answer: have a look at Doom9's MP4 Guide or Nero Recode2 Guide
detailed answer:
1) To create MP4 files you should preferably use audio/video formats covered by the MPEG-4 Standard:
- MP4 video formats: MPEG-4 SP/ASP: XviD, DivX5, 3ivx, ffmpeg/ffdshow, NeroDigital ASP... and MPEG-4 AVC/H.264: x264, NeroDigital AVC, Apple... and MPEG-2, MPEG-1 (not DivX3/MS Mpeg-4, WM9, RV9 or VP6) - doom9's quality comparisons: 1 2
- MP4 audio formats: Advanced Audio Coding (AAC FAQ): Quicktime/iTunes, Nero, Psytel, FAAC (binary)... (rjamorim's quality comparisons: 1 2) and MP3, MP2, MP1, CELP (speech), TwinVQ (very low bitrates), SAOL (midi), ALS (lossless)
- MP4 subtitle/text format: MPEG-4 Timed Text (see question 7)
- MP4 picture formats: JPEG, PNG
