使用 ffmpeg 将 webm 转换为 wav [英] Coverting webm to wav with ffmpeg
问题描述
我已经成功地在 Python 中使用 ffmpeg 将 mp3 文件转换为 wav,以便我可以将它们发布到 Google Speech-To-Text.现在我对 webm 文件有同样的情况,我拥有的旧功能不起作用.它应该将文件转换为 wav 并将其拆分为 15 秒的块.我可以从 webm -file 执行此操作,还是需要先将其转换为其他格式?
I've succesfully used ffmpeg in Python to convert mp3-files into wav so I can post them to Google Speech-To-Text. Now I have same situation with webm files and the old function I have doesn't work. It should convert the file into wav and split it into 15 second chunks. Can I do this from webm -file or do I need to convert it first into some other format?
我使用过的函数:
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.忘了提及该函数目前对 webm -files 的作用.它产生一个 wav -file out000000000.wav
这是空的.在控制台中,我收到如下错误消息:
EDIT. Forgot to mention what the function does at the moment with webm -files. It produces one wav -file out000000000.wav
which is empty. In the console I get an error message like this:
[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 implemented
编辑2.我认为我是对的,但想听听是否有更好的方法来做到这一点.
EDIT2. I got it right I think but would like to hear if there's a better way to do this.
首先,我将文件转换为单声道 wav,然后将其拆分为多个块.请随时指出任何错误或错误.
First I convert the file to a mono wav and then split it into chunks. Please feel free to point out any mistakes or errors.
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)
编辑3.我尝试了 lllogan 提供的功能,但出现此错误:
EDIT3. I tried the function llogan offered and I get this error:
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 中的音频质量比原始 webm 中的要差.我能做些什么吗?
It works when I use two seperate functions but I think the audio quality is worse in wav than in the original webm. Anything I can do to that?
推荐答案
需要转换为pcm数据:
You need to convert to pcm data:
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%
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