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Video d’abeille en portrait
14 mai 2011, par
Mis à jour : Février 2012
Langue : français
Type : Video
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Sur d’autres sites (8214)
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How can I convert audio to WAVE_FORMAT_PCM using FFmpeg ?
16 juin, par Eric StdlibI am using Python's
wavemodule to read audio, and using FFmpeg to convert audio from other types to wav. However, I am encountering some problem.


I wrote
v.pyto generate an silence audio filea.wav


import sys, wave, math
import numpy as np

wave_data = np.zeros(44100).astype(np.short)

f = wave.open('a.wav', 'wb')
f.setnchannels(1)
f.setsampwidth(2)
f.setframerate(96000)
f.writeframes(wave_data.tostring())
f.close()



Then I used FFmpeg to "copy"
a.wavtob.wav(though it seems to encode / decode the file), but I can only reada.wavwith Python ;b.wavcannot be opened.


[user@localhost tmp]$ ffmpeg -i a.wav b.wav
Guessed Channel Layout for Input Stream #0.0 : mono
Input #0, wav, from 'a.wav':
 Duration: 00:00:00.46, bitrate: 1536 kb/s
 Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 96000 Hz, mono, s16, 1536 kb/s
Stream mapping:
 Stream #0:0 -> #0:0 (pcm_s16le (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, wav, to 'b.wav':
 Metadata:
 ISFT : Lavf57.71.100
 Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 96000 Hz, mono, s16, 1536 kb/s
 Metadata:
 encoder : Lavc57.89.100 pcm_s16le
size= 86kB time=00:00:00.45 bitrate=1537.8kbits/s speed= 706x 
video:0kB audio:86kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.115646%
[user@localhost tmp]$ python3
Python 3.6.4 (default, Jan 23 2018, 22:25:37) 
[GCC 7.2.1 20170915 (Red Hat 7.2.1-2)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import wave
>>> wave.open('a.wav')

>>> wave.open('b.wav')
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/usr/lib64/python3.6/wave.py", line 499, in open
 return Wave_read(f)
 File "/usr/lib64/python3.6/wave.py", line 163, in __init__
 self.initfp(f)
 File "/usr/lib64/python3.6/wave.py", line 143, in initfp
 self._read_fmt_chunk(chunk)
 File "/usr/lib64/python3.6/wave.py", line 260, in _read_fmt_chunk
 raise Error('unknown format: %r' % (wFormatTag,))
wave.Error: unknown format: 65534
>>> 
</module></stdin>


How should I change the command of FFmpeg to convert the file to WAVE_FORMAT_PCM, so that I can read
b.wavwith Python ?

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Want to send a video from desktop to Wowza using ffmpeg
3 mars 2018, par ST94I am trying to stream a local
.mp4video file from my laptop toWowza Streaming Engineusing ffmpeg. Both systems are able to ping each other. I give the following command on my laptopffmpeg -re -i bunny_1080p_60fps_normal.mp4 -vcodec libx264 -acodec aac -ar 48000 -strict experimental -f flv "rtmp://192.168.1.22:1935/live/myStream"192.168.1.22is the IP address of Wowza server residing on another system runningUbuntu 17.04.I see the following on the command prompt of my laptop when I give the above command,
ffmpeg version N-89894-g18e2ac032e Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 7.2.0 (GCC)
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libmfx --enable-amf --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth
libavutil 56. 7.100 / 56. 7.100
libavcodec 58. 9.100 / 58. 9.100
libavformat 58. 5.101 / 58. 5.101
libavdevice 58. 0.101 / 58. 0.101
libavfilter 7. 11.101 / 7. 11.101
libswscale 5. 0.101 / 5. 0.101
libswresample 3. 0.101 / 3. 0.101
libpostproc 55. 0.100 / 55. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'bunny_1080p_60fps_normal.mp4':
Metadata:
major_brand : isom
minor_version : 1
compatible_brands: isomavc1
creation_time : 2013-12-16T17:59:32.000000Z
title : Big Buck Bunny, Sunflower version
artist : Blender Foundation 2008, Janus Bager Kristensen 2013
comment : Creative Commons Attribution 3.0 - http://bbb3d.renderfarming.net
genre : Animation
composer : Sacha Goedegebure
Duration: 00:10:34.53, start: 0.000000, bitrate: 4486 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 4001 kb/s, 60 fps, 60 tbr, 60k tbn, 120 tbc (default)
Metadata:
creation_time : 2013-12-16T17:59:32.000000Z
handler_name : GPAC ISO Video Handler
Stream #0:1(und): Audio: mp3 (mp4a / 0x6134706D), 48000 Hz, stereo, s16p, 160 kb/s (default)
Metadata:
creation_time : 2013-12-16T17:59:37.000000Z
handler_name : GPAC ISO Audio Handler
Stream #0:2(und): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, 5.1(side), fltp, 320 kb/s (default)
Metadata:
creation_time : 2013-12-16T17:59:37.000000Z
handler_name : GPAC ISO Audio Handler
Side data:
audio service type: main
[rtmp @ 000001ed7c4108c0] No credentials set
[rtmp @ 000001ed7c4108c0] Server error: [ AccessManager.Reject ] : [ code=403 need auth; authmod=adobe ] :
rtmp://192.168.1.22:1935/live/myStream: Unknown error occurredCan anyone please tell me what the exact procedure is to stream a video file to Wowza .
How will I be able to view the stream at Wowza ?
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FFmpeg recording works on one laptop but not the other
30 novembre 2019, par Jason TThe following command :
ffmpeg -f dshow -framerate 30 -video_size 640x480 -i video="HD Pro Webcam C920" out.mp4works on one laptop (with C920 LogiTech camera) (Im calling it GOOD LAPTOP). It outputs a recorded video. But it will fail on another laptop (called BAD LAPTOP) and by fail on another I mean - it doesnt output a video (see below for output).
The suggestions are to change parameters based on the specific error that occur on BAD LAPTOP. I have tried many different suggestions but they dont seem to work. Furthermore, they dont provide much insight into the underlying cause of the problem.
Ive used the same camera on both laptops. Im using static windows binaries downloaded from FFmpeg web-site (veranoe). Please note the versions used below were different but that doesnt appear to matter.
Trying to diagnose. Anyone have an idea of where the problem may lie. It seems to indicate a problem at the level of the system / camera setup.
Please note that I’ve updated BAD LAPTOP but still no dice. Also please note that Ive tried this on several systems already and it seems to run ok (i.e., produce an output video)
BAD LAPTOP :
$ ffmpeg -y -f dshow -framerate 30 -video_size 640x480 -t 10 -i video="HD Pro Webcam C920" out.mp4
ffmpeg version git-2019-11-26-59d264b Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 9.2.1 (GCC) 20191125
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
libavutil 56. 36.100 / 56. 36.100
libavcodec 58. 62.100 / 58. 62.100
libavformat 58. 35.100 / 58. 35.100
libavdevice 58. 9.101 / 58. 9.101
libavfilter 7. 67.100 / 7. 67.100
libswscale 5. 6.100 / 5. 6.100
libswresample 3. 6.100 / 3. 6.100
libpostproc 55. 6.100 / 55. 6.100
Input #0, dshow, from 'video=HD Pro Webcam C920':
Duration: N/A, bitrate: N/A
Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 30 fps, 30 tbr, 10000k tbn, 10000k tbc
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
Press [q] to stop, [?] for help
video=HD Pro Webcam C920: I/O error
[libx264 @ 06cb7a00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 06cb7a00] profile High 4:2:2, level 3.0, 4:2:2, 8-bit
[libx264 @ 06cb7a00] 264 - core 158 - H.264/MPEG-4 AVC codec - Copyleft 2003-2019 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'out.mp4':
Metadata:
encoder : Lavf58.35.100
Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv422p, 640x480, q=-1--1, 30 fps, 10000k tbn, 30 tbc
Metadata:
encoder : Lavc58.62.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
frame= 0 fps=0.0 q=0.0 Lsize= 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: unknownGOOD LAPTOP :
$ ffmpeg -y -f dshow -framerate 30 -video_size 640x480 -t 10 -i video="Logitech HD Pro Webcam C920" out.mp4
ffmpeg version N-92780-gbb586a9703 Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 8.2.1 (GCC) 20181201
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-ico
nv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --en
able-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-lib
soxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx
264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvi
dstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enabl
e-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enab
le-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
libavutil 56. 25.100 / 56. 25.100
libavcodec 58. 42.104 / 58. 42.104
libavformat 58. 25.100 / 58. 25.100
libavdevice 58. 6.101 / 58. 6.101
libavfilter 7. 46.101 / 7. 46.101
libswscale 5. 4.100 / 5. 4.100
libswresample 3. 4.100 / 3. 4.100
libpostproc 55. 4.100 / 55. 4.100
Input #0, dshow, from 'video=Logitech HD Pro Webcam C920':
Duration: N/A, start: 35609.500000, bitrate: N/A
Stream #0:0: Video: mjpeg (Baseline) (MJPG / 0x47504A4D), yuvj422p(pc, bt470bg/unknown/unknown), 640x480,
30 fps, 30 tbr, 10000k tbn, 10000k tbc
Stream mapping:
Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 000001ec0b750100] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 000001ec0b750100] profile High 4:2:2, level 3.0, 4:2:2, 8-bit
[libx264 @ 000001ec0b750100] 264 - core 157 r2935 545de2f - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http
://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 ps
y_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma
_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 con
strained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 k
eyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69
qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'out.mp4':
Metadata:
encoder : Lavf58.25.100
Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuvj422p(pc), 640x480, q=-1--1, 30 fps, 10000k tbn
, 30 tbc
Metadata:
encoder : Lavc58.42.104 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
frame= 62 fps= 31 q=29.0 size= 0kB time=00:00:00.10 bitrate= 3.8kbits/s dup=1 drop=0 speed=0.0495x
frame= 77 fps= 30 q=29.0 size= 0kB time=00:00:00.60 bitrate= 0.6kbits/s dup=1 drop=0 speed=0.237x
frame= 92 fps= 30 q=29.0 size= 0kB time=00:00:01.09 bitrate= 0.3kbits/s dup=1 drop=0 speed=0.363x
frame= 107 fps= 30 q=29.0 size= 0kB time=00:00:01.59 bitrate= 0.2kbits/s dup=1 drop=0 speed=0.453x
frame= 168 fps= 30 q=29.0 size= 256kB time=00:00:03.63 bitrate= 577.3kbits/s dup=1 drop=0 speed=0.654x
frame= 183 fps= 30 q=29.0 size= 256kB time=00:00:04.13 bitrate= 507.5kbits/s dup=1 drop=0 speed=0.683x
frame= 198 fps= 30 q=29.0 size= 256kB time=00:00:04.63 bitrate= 452.7kbits/s dup=1 drop=0 speed=0.706x
frame= 213 fps= 30 q=29.0 size= 512kB time=00:00:05.13 bitrate= 817.1kbits/s dup=1 drop=0 speed=0.727x
frame= 228 fps= 30 q=29.0 size= 512kB time=00:00:05.63 bitrate= 744.6kbits/s dup=1 drop=0 speed=0.744x
frame= 243 fps= 30 q=29.0 size= 512kB time=00:00:06.13 bitrate= 683.9kbits/s dup=1 drop=0 speed=0.759x
frame= 259 fps= 30 q=29.0 size= 512kB time=00:00:06.66 bitrate= 629.2kbits/s dup=1 drop=0 speed=0.777x
frame= 274 fps= 30 q=29.0 size= 512kB time=00:00:07.16 bitrate= 585.3kbits/s dup=1 drop=0 speed=0.789x
frame= 289 fps= 30 q=29.0 size= 512kB time=00:00:07.66 bitrate= 547.1kbits/s dup=1 drop=0 speed=0.799x
frame= 301 fps= 30 q=-1.0 Lsize= 973kB time=00:00:09.93 bitrate= 802.7kbits/s dup=1 drop=0 speed=0.975x
video:969kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.445649%
[libx264 @ 000001ec0b750100] frame I:4 Avg QP:24.23 size: 13237
[libx264 @ 000001ec0b750100] frame P:77 Avg QP:24.67 size: 7807
[libx264 @ 000001ec0b750100] frame B:220 Avg QP:26.09 size: 1534
[libx264 @ 000001ec0b750100] consecutive B-frames: 2.3% 0.7% 0.0% 97.0%
[libx264 @ 000001ec0b750100] mb I I16..4: 19.6% 70.5% 9.9%
[libx264 @ 000001ec0b750100] mb P I16..4: 3.6% 3.3% 0.3% P16..4: 54.9% 11.7% 9.5% 0.0% 0.0% skip:16
.8%
[libx264 @ 000001ec0b750100] mb B I16..4: 0.1% 0.2% 0.0% B16..8: 28.2% 1.1% 0.2% direct: 7.9% skip:62
.2% L0:51.0% L1:45.9% BI: 3.1%
[libx264 @ 000001ec0b750100] 8x8 transform intra:56.1% inter:69.3%
[libx264 @ 000001ec0b750100] coded y,uvDC,uvAC intra: 35.2% 85.0% 30.8% inter: 9.3% 38.8% 1.5%
[libx264 @ 000001ec0b750100] i16 v,h,dc,p: 32% 34% 8% 27%
[libx264 @ 000001ec0b750100] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 33% 18% 28% 2% 3% 5% 3% 5% 3%
[libx264 @ 000001ec0b750100] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 40% 19% 8% 3% 6% 11% 4% 6% 3%
[libx264 @ 000001ec0b750100] i8c dc,h,v,p: 48% 16% 31% 5%
[libx264 @ 000001ec0b750100] Weighted P-Frames: Y:3.9% UV:1.3%
[libx264 @ 000001ec0b750100] ref P L0: 39.0% 6.6% 38.0% 16.3% 0.1%
[libx264 @ 000001ec0b750100] ref B L0: 61.8% 30.3% 7.9%
[libx264 @ 000001ec0b750100] ref B L1: 84.4% 15.6%
[libx264 @ 000001ec0b750100] kb/s:790.62
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