如何从无尽的音频流中获取和分开音频

发布于 2025-01-24 17:51:31 字数 747 浏览 5 评论 0原文

首先，我有一个无尽的凸轮流，其中包括音频和视频。

如何根据RTSP流中的时间间隔在流媒体流中进行分配。

我已经尝试了下面的代码，但是在流结束之前我无法获取音频数据

command = ['ffmpeg.exe',
                   '-i', 'rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mp4',
                   '-f', 's16le',
                   '-acodec', 'libmp3lame',
                   '-ar', '44100',  
                   '-ac', '2', 
                   '-']
 
pipe = sp.Popen(command, stdout=sp.PIPE)

raw_audio = self.pipe.stdout.read()
print(raw_audio)

原文

Firstly I have an endless cam stream which includes audio and video.

How to get divided .wav files according to time intervals from RTSP streaming while streaming.

I have tried the code below but I couldn't get the audio data before the stream ended

command = ['ffmpeg.exe',
                   '-i', 'rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mp4',
                   '-f', 's16le',
                   '-acodec', 'libmp3lame',
                   '-ar', '44100',  
                   '-ac', '2', 
                   '-']
 
pipe = sp.Popen(command, stdout=sp.PIPE)

raw_audio = self.pipe.stdout.read()
print(raw_audio)

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

吃不饱 2025-01-31 17:51:31

尝试 -f segment 输出容器。类似：

command = ['ffmpeg.exe',
    "-i", r"rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mp4",
    '-vn', '-acodec', 'pcm_s16le', '-ar', '44100', '-ac', '2', 
    "-f", "segment", '-segment_time','3','out%03d.wav']
)

现在，如果您真正需要的是原始样本，而不一定是.wav文件，则需要通过删除' - acodec'，'libmp3lame'来修复命令，并指定号码要阅读的样本：

# how to read a block of audio data from stdout
n = 44100 * 3 # # of samples (sampling rate * duration)
nbytes = n * 2 * 2 # (#samples * #ch  * 2 bytes/sample)
while True:
    raw_audio = np.frombuffer(self.pipe.stdout.read(nread),shape=(n,2), dtype=np.int16)

    ... # do your thing

Try -f segment output container. Something like:

command = ['ffmpeg.exe',
    "-i", r"rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mp4",
    '-vn', '-acodec', 'pcm_s16le', '-ar', '44100', '-ac', '2', 
    "-f", "segment", '-segment_time','3','out%03d.wav']
)

Now, if what you really need are the raw samples and not necessarily .wav files, you need to fix your command by removing the '-acodec', 'libmp3lame' option and specify the number of samples to read:

# how to read a block of audio data from stdout
n = 44100 * 3 # # of samples (sampling rate * duration)
nbytes = n * 2 * 2 # (#samples * #ch  * 2 bytes/sample)
while True:
    raw_audio = np.frombuffer(self.pipe.stdout.read(nread),shape=(n,2), dtype=np.int16)

    ... # do your thing

回复收藏 0 原文

~没有更多了~