使用ffmpeg将webm转换为wav
使用ffmpeg将webm转换为wav
提问于 2020-05-28 20:25:25
我已经成功地在Python中使用ffmpeg将mp3文件转换为wav，这样我就可以将它们发布到Google Speech- to -Text。现在我遇到了同样的情况，webm文件和我的旧功能不起作用。它应该将文件转换为wav，并将其分成15秒的块。我可以在webm -file中执行此操作吗?还是需要先将其转换为其他格式？
我使用的函数：
def convert_and_split(filename):
command = ['ffmpeg', '-i', filename, '-f', 'segment', '-segment_time', '15', '-c', 'copy', 'parts/out%09d.wav']
subprocess.run(command,stdout=subprocess.PIPE,stdin=subprocess.PIPE)编辑。忘了提一下这个函数现在用webm -files做了什么。它生成一个为空的wav -file out000000000.wav。在控制台中，我收到如下错误消息：
[segment @ 0x55970b22fe80] Opening 'parts/out000000000.wav' for writing
[wav @ 0x55970b1ffbc0] opus codec not supported in WAVE format
Could not write header for output file #0 (incorrect codec parameters ?): Function not implementedEDIT2。我想我做的是对的，但我想听听有没有更好的方法。
首先，我将文件转换为单声道wav，然后将其拆分成块。请随时指出任何错误或错误。
def convert_webm_to_wav(file):
command = ['ffmpeg', '-i', file, '-acodec', 'pcm_s16le', '-ac', '1', '-ar', '16000', '/home/janip/openvidu_files/' + file.name[:-5] + '.wav']
subprocess.run(command,stdout=subprocess.PIPE,stdin=subprocess.PIPE)
def split_audio(filename):
command = ['ffmpeg', '-i', filename, '-f', 'segment', '-segment_time', '15', '-c', 'copy', '/home/janip/work/Holda/Nut_ideas/voice_chat_demos/openvidu-tutorials/openvidu-js-node/python_scripts/parts/out%09d.wav']
subprocess.run(command,stdout=subprocess.PIPE,stdin=subprocess.PIPE)EDIT3。我尝试了llogan提供的函数，得到了这个错误：
error:[segment @ 0x55f1c28d2740] Opening 'parts/out000000000.wav' for writing
[segment @ 0x55f1c28d2740] Failed to open segment 'parts/out000000000.wav'
Could not write header for output file #0 (incorrect codec parameters ?): No such file or directory
Error initializing output stream 0:0 --
error:Conversion failed!当我使用两个单独的函数时，它可以工作，但我认为wav的音频质量比原始的webm更差。我能对此做些什么？
回答 2
Stack Overflow用户
发布于 2020-05-28 20:47:02
您需要转换为pcm数据：
ffmpeg -i ./big-buck-bunny_trailer.webm -c:a pcm_f32le ./out.wav输出：
ffmpeg version 4.2.3 Copyright (c) 2000-2020 the FFmpeg developers
built with Apple clang version 11.0.3 (clang-1103.0.32.59)
configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.3 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags=-fno-stack-check --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
libavutil 56. 31.100 / 56. 31.100
libavcodec 58. 54.100 / 58. 54.100
libavformat 58. 29.100 / 58. 29.100
libavdevice 58. 8.100 / 58. 8.100
libavfilter 7. 57.100 / 7. 57.100
libavresample 4. 0. 0 / 4. 0. 0
libswscale 5. 5.100 / 5. 5.100
libswresample 3. 5.100 / 3. 5.100
libpostproc 55. 5.100 / 55. 5.100
Input #0, matroska,webm, from './big-buck-bunny_trailer.webm':
Metadata:
encoder : http://sourceforge.net/projects/yamka
creation_time : 2010-05-20T08:21:12.000000Z
Duration: 00:00:32.48, start: 0.000000, bitrate: 533 kb/s
Stream #0:0(eng): Video: vp8, yuv420p(progressive), 640x360, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 1k tbn, 1k tbc (default)
Stream #0:1(eng): Audio: vorbis, 44100 Hz, mono, fltp (default)
Stream mapping:
Stream #0:1 -> #0:0 (vorbis (native) -> pcm_f32le (native))
Press [q] to stop, [?] for help
Output #0, wav, to './out.wav':
Metadata:
ISFT : Lavf58.29.100
Stream #0:0(eng): Audio: pcm_f32le ([3][0][0][0] / 0x0003), 44100 Hz, mono, flt, 1411 kb/s (default)
Metadata:
encoder : Lavc58.54.100 pcm_f32le
size= 5597kB time=00:00:32.50 bitrate=1410.7kbits/s speed= 625x
video:0kB audio:5597kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.001989%Stack Overflow用户
发布于 2020-05-29 03:00:34
不需要转换为WAV，然后执行单独的命令进行分段。只需删除-c copy并在一个命令中完成所有操作：
def convert_and_split(filename):
command = ['ffmpeg', '-i', filename, '-f', 'segment', '-segment_time', '15', 'out%09d.wav']
subprocess.run(command,stdout=subprocess.PIPE,stdin=subprocess.PIPE)-c copy启用流复制模式。这就像复制和粘贴一样，但你不能把Opus音频放到WAV中。删除-c copy将允许ffmpeg将Opus转换为WAV。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/62064665
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