CONY的世界

為了要各方面測試Encoder和Decoder，所以常需要製作特別的mp4
今天特別把好用的tool整理一下

資料主要參考: http://idaiwan.pixnet.net/blog/post/26310277-%E4%BD%BF%E7%94%A8-mp4box-%E5%88%86%E5%89%B2%E8%A6%96%E8%A8%8A%E6%A0%BC%E5%BC%8F%E7%82%BA-h264%EF%BC%88avc%EF%BC%89%E7%9A%84-flv-%E6%AA%94 

使用的工具是 mp4box  

是在window下執行的exe檔，然後下command去操作 (我安裝完後，MP4Box.exe在C:\Program Files\GPAC下) 
 
例如要將一個音訊和一個視訊包在同一個mp4裡面可以下

MP4Box.exe -add video.264 -add audio.aac -fps 25.03 output.mp4

可用
-fps 來指定 frame rate  (我曾經成功製作出1080p 60fps的影片，其實就是設定time stamp而已)

也可以切割特定時間的影片
MP4Box.exe -splitx 9:31.5 output.mp4 

也可用它來看mp4的資訊

MP4Box.exe -info file.mp4
* Movie Info *
    Timescale 600 - Duration 00:04:03.583
    Fragmented File no - 2 track(s)
    File Brand isom - version 1
    Created: GMT Wed Jul 27 04:44:43 2011

File has root IOD
Scene PL 0xff - Graphics PL 0xff - OD PL 0xff
Visual PL: AVC/H264 Profile (0x15)
Audio PL: No audio capability required (0xff)
No streams included in root OD

Track # 1 Info - TrackID 1 - TimeScale 24000 - Duration 00:04:03.576
Media Info: Language "Undetermined" - Type "vide:avc1" - 5840 samples
MPEG-4 Config: Visual Stream - ObjectTypeIndication 0x21
AVC/H264 Video - Visual Size 720 x 480 - Profile High @ Level 4.1
NAL Unit length bits: 32
Pixel Aspect Ratio 1:1 - Indicated track size 720 x 480
Self-synchronized

Track # 2 Info - TrackID 2 - TimeScale 48000 - Duration 00:04:03.584
Media Info: Language "Undetermined" - Type "soun:ac-3" - 7612 samples 

MP4Box.exe -raw 1 file.mp4
Extracting MPEG-4 AVC-H264 stream to h264

提出來就是h.264檔案了

總之提法就是:  MP4Box.exe -raw track (#number) (input filename) 
track2的提法 

R:\>mp4box -raw 2 file.mp4
Extracting AC3 Audio