我从似乎是mp3源的URL成功录制了音频,并发送了此命令。
$ ffmpeg -y -t "00:01:00" -i $url2 -c copy url2.mp3
ffmpeg version N-93762-ge384f6f2f9 Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 7.4.0 (GCC)
configuration:
libavutil 56. 26.100 / 56. 26.100
libavcodec 58. 52.100 / 58. 52.100
libavformat 58. 27.103 / 58. 27.103
libavdevice 58. 7.100 / 58. 7.100
libavfilter 7. 50.100 / 7. 50.100
libswscale 5. 4.100 / 5. 4.100
libswresample 3. 4.100 / 3. 4.100
Input #0, aac, from 'http://someurl2:1234':
Metadata:
icy-notice1 : <BR>This stream requires <a href="http://www.winamp.com">Winamp</a><BR>
icy-notice2 : SHOUTcast DNAS/posix(linux x64) v2.5.5.733<BR>
icy-name : some name
icy-genre : Talk
icy-br : 48
icy-sr : 22050
icy-url :
icy-pub : 0
StreamTitle : some title
Duration: N/A, bitrate: 47 kb/s
Stream #0:0: Audio: aac (HE-AACv2), 44100 Hz, stereo, fltp, 47 kb/s
[mp3 @ 0x80003c280] Invalid audio stream. Exactly one MP3 audio stream is required.
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Last message repeated 1 times
现在,当我尝试从另一个似乎是AAC音频源的URL进行录制时出现错误。
$ ffmpeg -y -t "00:01:00" -i $url2 -c copy url2.aac
ffmpeg version N-93762-ge384f6f2f9 Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 7.4.0 (GCC)
configuration:
libavutil 56. 26.100 / 56. 26.100
libavcodec 58. 52.100 / 58. 52.100
libavformat 58. 27.103 / 58. 27.103
libavdevice 58. 7.100 / 58. 7.100
libavfilter 7. 50.100 / 7. 50.100
libswscale 5. 4.100 / 5. 4.100
libswresample 3. 4.100 / 3. 4.100
Input #0, aac, from 'http://someurl2:1234':
Metadata:
icy-notice1 : <BR>This stream requires <a href="http://www.winamp.com">Winamp</a><BR>
icy-notice2 : SHOUTcast DNAS/posix(linux x64) v2.5.5.733<BR>
icy-name : some name
icy-genre : Talk
icy-br : 48
icy-sr : 22050
icy-url :
icy-pub : 0
StreamTitle : some title
Duration: N/A, bitrate: 48 kb/s
Stream #0:0: Audio: aac (HE-AACv2), 44100 Hz, stereo, fltp, 48 kb/s
Output #0, adts, to 'url2.aac':
Metadata:
icy-notice1 : <BR>This stream requires <a href="http://www.winamp.com">Winamp</a><BR>
icy-notice2 : SHOUTcast DNAS/posix(linux x64) v2.5.5.733<BR>
icy-name : some name
icy-genre : Talk
icy-br : 48
icy-sr : 22050
icy-url :
icy-pub : 0
StreamTitle : some title
encoder : Lavf58.27.103
Stream #0:0: Audio: aac (HE-AACv2), 44100 Hz, stereo, fltp, 48 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
size= 0kB time=00:00:00.00 bitrate=N/A speed= 0x
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)
如果我尝试将其另存为aac文件,则会收到以下消息:
run_until_complete()
如何记录来自URL的源音频何时是aac? 有没有一种方法可以在录音之前确定是mp3还是aac?预先感谢
答案 0 :(得分:4)
在您的第一个命令中,使用-c copy
是错误的,因为您需要将 aac(HE-AACv2)重新编码为 mp3 。
请参见ffmpeg documentation:
特殊值副本(仅用于输出),指示流将不被重新编码
我建议您尝试一下:
ffmpeg -y -t "00:01:00" -i [stream URL] -codec:a libmp3lame output.mp3
不幸的是,我无法根据您在注释(http://dreamsiteradiocp4.com:8120/: Connection refused
)中提供的URL对其进行测试,但是它成功地与fmstream.org中列出的AAC流一起使用。