这个文件是有声音的，而且能听见，音轨为证

Video
ID : 2
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Baseline@L3.2
Format settings : 1 Ref Frames
Format settings, CABAC : No
Format settings, ReFrames : 1 frame
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 2 s 985 ms
Bit rate : 1 311 kb/s
Width : 1 280 pixels
Height : 960 pixels
Display aspect ratio : 4:3
Rotation : 90°
Frame rate mode : Variable
Frame rate : 12.729 FPS
Minimum frame rate : 9.944 FPS
Maximum frame rate : 16.772 FPS
Standard : NTSC
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.084
Stream size : 478 KiB (95%)
Title : VideoHandle
Language : English
Encoded date : UTC 2018-11-23 05:28:12
Tagged date : UTC 2018-11-23 05:28:12
Color range : Limited
Color primaries : BT.601 PAL
mdhd_Duration : 2985

Audio
ID : 1
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : mp4a-40-2
Duration : 3 s 224 ms
Source duration : 3 s 291 ms
Bit rate mode : Constant
Bit rate : 59.0 kb/s
Nominal bit rate : 64.0 kb/s
Channel(s) : 1 channel
Channel positions : Front: C
Sampling rate : 44.1 kHz
Frame rate : 43.066 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 23.2 KiB (5%)
Source stream size : 23.2 KiB (5%)
Title : SoundHandle
Language : English
Encoded date : UTC 2018-11-23 05:28:12
Tagged date : UTC 2018-11-23 05:28:12
mdhd_Duration : 3224

录制出来mp4没有声音 #2

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