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关于dvsdk的问题请教，./encode

jm luo
Prodigy 130 points


dm6467T平台，TI原装的开发板，用的dvsdk版本是dvsdk_3_10_00_19， 执行" ./encode -v hh.264 -a aa.aac -l "，aac设的默认参数是64000,44100,但为什么录出来的aac文件总是在60kbps以下呢？

打印出来的数据如下：

Encode demo ARM Load: 7% DSP Load: 35% Display Type: 720P 60Hz Video Codec: H.264 HP Video fps: 30 fps Video bit rate: 1277 kbps Video resolution: 1280x720 Sound codec: N/A Sound bit rate: 60 kbps Sampling freq: 44100 Time: 00:10:53

Encode demo ARM Load: 1% DSP Load: 35% Display Type: 720P 60Hz Video Codec: H.264 HP Video fps: 30 fps Video bit rate: 1289 kbps Video resolution: 1280x720 Sound codec: N/A Sound bit rate: 59 kbps Sampling freq: 44100 Time: 00:10:54

Encode demo ARM Load: 5% DSP Load: 35% Display Type: 720P 60Hz Video Codec: H.264 HP Video fps: 30 fps Video bit rate: 1035 kbps Video resolution: 1280x720 Sound codec: N/A Sound bit rate: 59 kbps Sampling freq: 44100 Time: 00:10:55

Encode demo ARM Load: 8% DSP Load: 35% Display Type: 720P 60Hz Video Codec: H.264 HP Video fps: 30 fps Video bit rate: 977 kbps Video resolution: 1280x720 Sound codec: N/A Sound bit rate: 59 kbps Sampling freq: 44100 Time: 00:10:57

Encode demo ARM Load: 11% DSP Load: 35% Display Type: 720P 60Hz Video Codec: H.264 HP Video fps: 28 fps Video bit rate: 983 kbps Video resolution: 1280x720 Sound codec: N/A Sound bit rate: 60 kbps Sampling freq: 44100 Time: 00:10:58

Encode demo ARM Load: 7% DSP Load: 35% Display Type: 720P 60Hz Video Codec: H.264 HP Video fps: 30 fps Video bit rate: 1203 kbps Video resolution: 1280x720 Sound codec: N/A Sound bit rate: 59 kbps Sampling freq: 44100 Time: 00:10:59

Encode demo ARM Load: 3% DSP Load: 35% Display Type: 720P 60Hz Video Codec: H.264 HP Video fps: 30 fps Video bit rate: 1030 kbps Video resolution: 1280x720 Sound codec: N/A Sound bit rate: 59 kbps Sampling freq: 44100 Time: 00:11:00

Encode demo ARM Load: 5% DSP Load: 35% Display Type: 720P 60Hz Video Codec: H.264 HP Video fps: 30 fps Video bit rate: 1013 kbps Video resolution: 1280x720 Sound codec: N/A Sound bit rate: 60 kbps Sampling freq: 44100 Time: 00:11:01

Encode demo ARM Load: 5% DSP Load: 35% Display Type: 720P 60Hz Video Codec: H.264 HP Video fps: 31 fps Video bit rate: 1120 kbps Video resolution: 1280x720 Sound codec: N/A Sound bit rate: 59 kbps Sampling freq: 44100 Time: 00:11:03

Encode demo ARM Load: 4% DSP Load: 35% Display Type: 720P 60Hz Video Codec: H.264 HP Video fps: 30 fps Video bit rate: 1148 kbps Video resolution: 1280x720 Sound codec: N/A Sound bit rate: 59 kbps Sampling freq: 44100 Time: 00:11:04

Encode demo ARM Load: 5% DSP Load: 35% Display Type: 720P 60Hz Video Codec: H.264 HP Video fps: 30 fps Video bit rate: 1379 kbps Video resolution: 1280x720 Sound codec: N/A Sound bit rate: 60 kbps Sampling freq: 44100 Time: 00:11:05

Encode demo ARM Load: 9% DSP Load: 35% Display Type: 720P 60Hz Video Codec: H.264 HP Video fps: 30 fps Video bit rate: 1459 kbps Video resolution: 1280x720 Sound codec: N/A Sound bit rate: 59 kbps Sampling freq: 44100 Time: 00:11:06

  • 0
    TI__Expert 4400 points

    codec码率有波动很正常吧？  录下来的文件播放有杂音吗？ 

  • 0 回复 Tuff Li
    Prodigy 130 points

    没有杂音，但音调变了。跟实际对比，完全是两个人的声音。

  • 0 回复 Tuff Li
    Prodigy 130 points

    这不是正常的波动，是一直在60kbps以下，但我设的是64kbps，造成录出来的文件播放时音调变快了，本来2分钟的录音，不到90秒就播完了。

    这个问题是在H264和AAC同时编码时出现，单独AAC编码就不会。

  • 0 回复 jm luo
    TI__Expert 4400 points

    "造成录出来的文件播放时音调变快了，本来2分钟的录音，不到90秒就播完了"

    encode录像出来的是ES流，没有帧率信息，播放的时候需要强制加上帧率播放

    你用什么软件播放视频的？ 如果编码帧率和播放帧率前后不一致，就会出现音调变化

  • 0 回复 Tuff Li
    Prodigy 130 points

    用暴风影音和VLC播放录出来的AAC文件，问题就是我设了是64kbps，录出来只有60kbps左右。用VLC播放时可以看到当前的内容位率的。

    而且我想问的是，单独编AAC是正常(设64kbps，录出来在63和65间波动)，

    但为什么同时编H264和AAC就会出现这个问题？

    "./encode -v hh.264 -a aa.aac -l"

    Encode demo ARM Load: 6% DSP Load: 35% Display Type: 720P 60Hz Video Codec: H.264 BP Video fps: 31 fps Video bit rate: 563 kbps Video resolution: 1280x720 Sound codec: N/A Sound bit rate: 60 kbps Sampling freq: 44100 Time: 00:02:19

    Encode demo ARM Load: 7% DSP Load: 35% Display Type: 720P 60Hz Video Codec: H.264 BP Video fps: 30 fps Video bit rate: 1149 kbps Video resolution: 1280x720 Sound codec: N/A Sound bit rate: 59 kbps Sampling freq: 44100 Time: 00:02:20

    Encode demo ARM Load: 9% DSP Load: 35% Display Type: 720P 60Hz Video Codec: H.264 BP Video fps: 30 fps Video bit rate: 1105 kbps Video resolution: 1280x720 Sound codec: N/A Sound bit rate: 59 kbps Sampling freq: 44100 Time: 00:02:22

    Encode demo ARM Load: 9% DSP Load: 35% Display Type: 720P 60Hz Video Codec: H.264 BP Video fps: 30 fps Video bit rate: 975 kbps Video resolution: 1280x720 Sound codec: N/A Sound bit rate: 59 kbps Sampling freq: 44100 Time: 00:02:23

    Encode demo ARM Load: 3% DSP Load: 35% Display Type: 720P 60Hz Video Codec: H.264 BP Video fps: 30 fps Video bit rate: 518 kbps Video resolution: 1280x720 Sound codec: N/A Sound bit rate: 59 kbps Sampling freq: 44100 Time: 00:02:24