首先執行 mp4box -info 檔案.mp4 檢視 mp4 檔案的資訊。直接看最後兩段都是以 Track # 開頭,就會知曉這裡 Track # 1 是 H264 視訊、Track # 2 是 AC3 音訊。
R:\>mp4box -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 AC3 stream - Sample Rate 48000 - 2 channel(s) 16 bits per samples
若要提取這裡的 Track # 1 也就是 H264 視訊,就執行 mp4box -raw 1 檔案.mp4。
R:\>mp4box -raw 1 file.mp4 Extracting MPEG-4 AVC-H264 stream to h264
提出來的檔案是 file_track1.h264。
若要提取這裡的 Track # 2 也就是 AC3 音訊,就執行 mp4box -raw 2 檔案.mp4。
R:\>mp4box -raw 2 file.mp4 Extracting AC3 Audio
提出來的檔案是 file_track2.ac3。
-raw 1、-raw 2:
-raw 表示直接提取 raw 格式;-raw 後面的數字 1、2 分別對應提取 mp4 檔案的 track 1、track 2。
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