任何FFMpeg专家都能帮助我解决以下问题吗？
我尝试将播客转换为PCM并将其下采样为16KHz单声道，然后将其转录到语音识别系统进行转录。命令行
ffmpeg -i http://media.blubrry.com/conlangery/content.blubrry.com/conlangery/Conlangery01.mp3 -f s16le -ac 1 -ar 16000 pipe:0
失败
av_interleaved_write_frame（）：错误的文件描述符
这里有什么问题，如何解决？
修改
完整的错误消息是
ffmpeg version N-83189-gd5d474aea5-static http://johnvansickle.com/ffmpeg/ Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 5.4.1 (Debian 5.4.1-4) 20161202
configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-5 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gray --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg
libavutil 55. 44.100 / 55. 44.100
libavcodec 57. 75.100 / 57. 75.100
libavformat 57. 62.100 / 57. 62.100
libavdevice 57. 2.100 / 57. 2.100
libavfilter 6. 69.100 / 6. 69.100
libswscale 4. 3.101 / 4. 3.101
libswresample 2. 4.100 / 2. 4.100
libpostproc 54. 2.100 / 54. 2.100
Input #0, mp3, from 'http://media.blubrry.com/conlangery/content.blubrry.com/conlangery/Conlangery01.mp3':
Metadata:
track : 1
album : Conlangery Podcast
title : Conlangery 01
artist : George Corley
date : 2011
Duration: 00:44:58.08, start: 0.025057, bitrate: 128 kb/s
Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
Metadata:
encoder : LAME3.98r
Output #0, s16le, to 'pipe:0':
Metadata:
track : 1
album : Conlangery Podcast
title : Conlangery 01
artist : George Corley
date : 2011
encoder : Lavf57.62.100
Stream #0:0: Audio: pcm_s16le, 16000 Hz, mono, s16, 256 kb/s
Metadata:
encoder : Lavc57.75.100 pcm_s16le
Stream mapping:
Stream #0:0 -> #0:0 (mp3 (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
av_interleaved_write_frame(): Bad file descriptor
Error writing trailer of pipe:0: Bad file descriptorsize= 1kB time=00:00:00.02 bitrate= 256.0kbits/s speed=95.2x
video:0kB audio:1kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%
Conversion failed!
Traceback (most recent call last):
File "./PodcastTranscriber.py", line 206, in <module>
PodcastTranscriber('http://conlangery.com/feed/',upload)()
File "./PodcastTranscriber.py", line 101, in __call__
self.process(item)
File "./PodcastTranscriber.py", line 136, in process
(audio,errors)=mp3.run(stdout=subprocess.PIPE)
File "/usr/local/lib/python2.7/site-packages/ffmpy.py", line 105, in run
raise FFRuntimeError(self.cmd, self.process.returncode, out[0], out[1])
ffmpy.FFRuntimeError: `ffmpeg -i http://media.blubrry.com/conlangery/content.blubrry.com/conlangery/Conlangery01.mp3 -f s16le -ac 1 -ar 16000 pipe:0` exited with status 1
调用代码是
def process(self,item):
"""Downloads the audio and transcribes it"""
audio_url=None
print item['title']
for link in item.links:
if link['rel']=='enclosure':
audio_url=link['href']
if audio_url is not None:
pubDate=to_date(item.published_parsed)
if self.lastUploadDate is None or pubDate>self.lastUploadDate:
self.lastUploadDate=pubDate
mp3=ffmpy.FFmpeg(inputs={audio_url:None},
outputs={'pipe:0':['-f','s16le','-ac','1','-ar','16000']})
(audio,errors)=mp3.run(stdout=subprocess.PIPE)
sphinx=subprocess.Popen(['java','-jar','transcriber.jar'],
stdin=audio,
stdout=subprocess.PIPE)
wiki=threading.Thread(target=self.callback,args=(item,sphinx.stdout))
wiki.start()
#mp3.start()
#mp3.join()
sphinx.stdin.close()
wiki.join()
sphinx.wait()