AVFoundation(AVPlayer)支持的格式?没有.vob或.mpg容器? [英] AVFoundation (AVPlayer) supported formats? No .vob or .mpg containers?
问题描述
在此处使用Mac应用程序中的AVPlayer在全屏播放文件夹中的随机视频，但是当我尝试播放.vob文件或.mpg文件时，我只会得到一个黑屏，持续时间与视频持续时间一样.
Using AVPlayer in a Mac app here to play random videos in fullscreen from a folder, but when I try to play .vob files or .mpg files I just get a black screen that lasts as long as the video lasts.
AVFoundation不支持从这些容器中回放吗?我认为，由于它们可以与库存的QuickTime Player一起播放，因此它们也可以与AVPlayer一起使用.
Does AVFoundation not support playback from these containers? I figured that since they were playable with stock QuickTime Player they would also work with AVPlayer.
推荐答案
The AVURLAsset class has a static methods that you can query for supported video UTIs:
+ (NSArray *)audiovisualTypes
在10.9.1上，它返回以下系统定义的UTI:
On 10.9.1 it returns these system defined UTIs:
- public.mpeg
- public.mpeg-2-video
- public.avi
- public.aifc-audio
- public.aac-audio
- public.mpeg-4
- public.au-audio
- public.aiff-audio
- public.mp2
- public.3gpp2
- public.ac3-audio
- public.mp3
- public.mpeg-2-transport-stream
- public.3gpp
- public.mpeg-4-audio
- public.mpeg
- public.mpeg-2-video
- public.avi
- public.aifc-audio
- public.aac-audio
- public.mpeg-4
- public.au-audio
- public.aiff-audio
- public.mp2
- public.3gpp2
- public.ac3-audio
- public.mp3
- public.mpeg-2-transport-stream
- public.3gpp
- public.mpeg-4-audio
这是对系统UTI的解释 .因此，似乎至少应该支持.mpg容器.
Here is an explanation of system UTIs. So it seems that at least the .mpg container should be supported.
根据Wiki ，.mpg文件可以包含MPEG-1或MPEG-2视频，但只能包含MPEG-2视频受支持.所以也许这就是为什么文件加载但什么都不显示的原因.
According to wiki, .mpg files can contain MPEG-1 or MPEG-2 video, but only MPEG-2 video is supported. So maybe that's why the file loads but nothing is displayed.
QuickTime内部使用 QTMovieModernizer 来播放视频以旧格式(如此WWDC会话中所述)，因此也许您可以对此进行研究.它甚至提供了一种确定文件是否需要现代化的方法:
QuickTime internally uses QTMovieModernizer in order to play videos in legacy formats (as mentioned in this WWDC session), so maybe you can look into that. It even has a method for determining if a file needs to be modernized:
+ requiresModernization:error:
这篇关于AVFoundation(AVPlayer)支持的格式?没有.vob或.mpg容器?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
