[FFmpeg-user] Play video and simultaneously record audio
Michael Koch
astroelectronic at t-online.de
Thu Jan 16 18:51:47 EET 2020
Hello Gyan,
>
>> can FFmpeg or FFplay be used for playing a video (without audio) and
>> exactly simultaneously record an audio file? I mean for making sound
>> effects for the video. If this isn't possible, is there any other
>> free software that can do it?
>
> Basic syntax would be,
>
> ffmpeg -re -i videofile -f audiodevice -i audiourl -map 1:a
> audioout.wav -map 0:v -f sdl2 -
>
My first test, this works fine:
ffmpeg -re -i test.mp4 -f sdl2 -
Question: Is there any documentation for -f sdl2 ?
My second test:
ffmpeg -re -i test.mp4 -f dshow -channels 2 -i audio="Mikrofon (Realtek
High Definiti" -y -map 1:a audio.wav -map 0:v -f sdl2 -
This command line has two problems:
1. The video doesn't play continuously, it's stop-and-go. May be my
notebook has not enough computing power? Any ideas how to avoid this
problem?
2. FFmpeg doesn't stop when the end of the video has been reached. The
audio file gets longer than the video. I did already try to add the
-shortest option, but it didn't solve the problem.
Here is the console output:
C:\Users\mKoch\Desktop>c://ffmpeg/ffmpeg -re -i test.mp4 -f dshow
-channels 2 -i
audio="Mikrofon (Realtek High Definiti" -y -map 1:a audio.wav -map 0:v
-f sdl2
-
ffmpeg version git-2020-01-15-0dc0837 Copyright (c) 2000-2020 the FFmpeg
develop
ers
built with gcc 9.2.1 (GCC) 20200111
configuration: --enable-gpl --enable-version3 --enable-sdl2
--enable-fontconfi
g --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d
--enable-libb
luray --enable-libfreetype --enable-libmp3lame
--enable-libopencore-amrnb --enab
le-libopencore-amrwb --enable-libopenjpeg --enable-libopus
--enable-libshine --e
nable-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 --enab
le-libvidstab --enable-libvorbis --enable-libvo-amrwbenc
--enable-libmysofa --en
able-libspeex --enable-libxvid --enable-libaom --enable-libmfx
--enable-ffnvcode
c --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec
--enable-dxva2 -
-enable-avisynth --enable-libopenmpt --enable-amf
libavutil 56. 38.100 / 56. 38.100
libavcodec 58. 65.103 / 58. 65.103
libavformat 58. 35.102 / 58. 35.102
libavdevice 58. 9.103 / 58. 9.103
libavfilter 7. 71.100 / 7. 71.100
libswscale 5. 6.100 / 5. 6.100
libswresample 3. 6.100 / 3. 6.100
libpostproc 55. 6.100 / 55. 6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
encoder : Lavf58.25.100
Duration: 00:00:06.57, start: 0.000000, bitrate: 12218 kb/s
Stream #0:0(eng): Video: mpeg4 (Simple Profile) (mp4v /
0x7634706D), yuv420p
, 1920x1080 [SAR 1:1 DAR 16:9], 12216 kb/s, 30 fps, 30 tbr, 15360 tbn,
30 tbc (d
efault)
Metadata:
handler_name : VideoHandler
timecode : 07:34:52:21
Stream #0:1(eng): Data: none (tmcd / 0x64636D74), 0 kb/s
Metadata:
handler_name : TimeCodeHandler
timecode : 07:34:52:21
Guessed Channel Layout for Input Stream #1.0 : stereo
Input #1, dshow, from 'audio=Mikrofon (Realtek High Definiti':
Duration: N/A, start: 31251.109000, bitrate: 1411 kb/s
Stream #1:0: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
Stream mapping:
Stream #1:0 -> #0:0 (pcm_s16le (native) -> pcm_s16le (native))
Stream #0:0 -> #1:0 (mpeg4 (native) -> rawvideo (native))
Press [q] to stop, [?] for help
Output #0, wav, to 'audio.wav':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
ISFT : Lavf58.35.102
Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz,
stereo, s16
, 1411 kb/s
Metadata:
encoder : Lavc58.65.103 pcm_s16le
Output #1, sdl,sdl2, to 'pipe:':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
encoder : Lavf58.35.102
Stream #1:0(eng): Video: rawvideo (I420 / 0x30323449), yuv420p,
1920x1080 [S
AR 1:1 DAR 16:9], q=2-31, 746496 kb/s, 30 fps, 30 tbn, 30 tbc (default)
Metadata:
handler_name : VideoHandler
timecode : 07:34:52:21
encoder : Lavc58.65.103 rawvideo
frame= 1 fps=0.0 q=-0.0 size= 172kB time=00:00:01.01
bitrate=1396.5kbits/
frame= 17 fps= 17 q=-0.0 size= 256kB time=00:00:01.51
bitrate=1387.0kbits/
frame= 32 fps= 21 q=-0.0 size= 256kB time=00:00:01.51
bitrate=1387.0kbits/
frame= 47 fps= 23 q=-0.0 size= 256kB time=00:00:02.53 bitrate=
828.3kbits/
frame= 62 fps= 24 q=-0.0 size= 256kB time=00:00:02.53 bitrate=
828.3kbits/
frame= 77 fps= 25 q=-0.0 size= 512kB time=00:00:03.55
bitrate=1180.5kbits/
frame= 93 fps= 26 q=-0.0 size= 512kB time=00:00:04.05
bitrate=1035.6kbits/
frame= 108 fps= 27 q=-0.0 size= 512kB time=00:00:04.05
bitrate=1035.6kbits/
frame= 123 fps= 27 q=-0.0 size= 768kB time=00:00:04.55
bitrate=1382.1kbits/
frame= 138 fps= 27 q=-0.0 size= 768kB time=00:00:05.06
bitrate=1242.6kbits/
frame= 153 fps= 28 q=-0.0 size= 768kB time=00:00:05.56
bitrate=1130.7kbits/
frame= 168 fps= 28 q=-0.0 size= 1024kB time=00:00:06.06
bitrate=1383.8kbits/
frame= 184 fps= 28 q=-0.0 size= 1024kB time=00:00:06.58
bitrate=1274.3kbits/
frame= 197 fps= 28 q=-0.0 size= 1024kB time=00:00:07.09
bitrate=1182.5kbits/
frame= 197 fps= 26 q=-0.0 size= 1280kB time=00:00:07.60
bitrate=1379.0kbits/
frame= 197 fps= 24 q=-0.0 size= 1280kB time=00:00:08.13
bitrate=1289.4kbits/
frame= 197 fps= 23 q=-0.0 size= 1280kB time=00:00:08.63
bitrate=1214.6kbits/
frame= 197 fps= 22 q=-0.0 size= 1536kB time=00:00:09.13
bitrate=1377.9kbits/
frame= 197 fps= 21 q=-0.0 size= 1536kB time=00:00:09.63
bitrate=1306.1kbits/
frame= 197 fps= 20 q=-0.0 size= 1536kB time=00:00:10.13
bitrate=1241.8kbits/
frame= 197 fps= 19 q=-0.0 size= 1792kB time=00:00:10.63
bitrate=1381.0kbits/
frame= 197 fps= 18 q=-0.0 size= 1792kB time=00:00:11.13
bitrate=1318.6kbits/
frame= 197 fps= 17 q=-0.0 size= 1792kB time=00:00:11.63
bitrate=1261.9kbits/
frame= 197 fps= 16 q=-0.0 size= 2048kB time=00:00:12.13
bitrate=1382.7kbits/
frame= 197 fps= 16 q=-0.0 size= 2048kB time=00:00:12.63
bitrate=1328.0kbits/
frame= 197 fps= 15 q=-0.0 size= 2048kB time=00:00:13.13
bitrate=1277.6kbits/
frame= 197 fps= 15 q=-0.0 size= 2304kB time=00:00:13.63
bitrate=1384.6kbits/
frame= 197 fps= 14 q=-0.0 size= 2304kB time=00:00:14.13
bitrate=1335.6kbits/
frame= 197 fps= 14 q=-0.0 size= 2304kB time=00:00:14.63
bitrate=1289.9kbits/
frame= 197 fps= 13 q=-0.0 size= 2560kB time=00:00:15.13
bitrate=1386.0kbits/
frame= 197 fps= 13 q=-0.0 size= 2560kB time=00:00:15.63
bitrate=1341.5kbits/
frame= 197 fps= 12 q=-0.0 size= 2560kB time=00:00:16.13
bitrate=1299.9kbits/
frame= 197 fps= 12 q=-0.0 size= 2816kB time=00:00:16.63
bitrate=1387.0kbits/
frame= 197 fps= 12 q=-0.0 size= 2816kB time=00:00:17.13
bitrate=1346.6kbits/
frame= 197 fps= 11 q=-0.0 size= 2816kB time=00:00:17.63
bitrate=1308.3kbits/
frame= 197 fps= 11 q=-0.0 size= 3072kB time=00:00:18.13
bitrate=1387.8kbits/
frame= 197 fps= 11 q=-0.0 size= 3072kB time=00:00:18.63
bitrate=1350.7kbits/
frame= 197 fps= 10 q=-0.0 size= 3072kB time=00:00:19.13
bitrate=1315.4kbits/
frame= 197 fps= 10 q=-0.0 size= 3328kB time=00:00:19.63
bitrate=1388.6kbits/
frame= 197 fps=9.8 q=-0.0 size= 3328kB time=00:00:20.13
bitrate=1354.2kbits/
frame= 197 fps=9.6 q=-0.0 size= 3328kB time=00:00:20.63
bitrate=1321.3kbits/
frame= 197 fps=9.3 q=-0.0 size= 3584kB time=00:00:21.13
bitrate=1389.4kbits/
frame= 197 fps=9.1 q=-0.0 size= 3584kB time=00:00:21.63
bitrate=1357.4kbits/
frame= 197 fps=8.9 q=-0.0 size= 3584kB time=00:00:22.13
bitrate=1326.5kbits/
frame= 197 fps=8.7 q=-0.0 size= 3840kB time=00:00:22.63
bitrate=1389.9kbits/
frame= 197 fps=8.5 q=-0.0 size= 3840kB time=00:00:23.13
bitrate=1359.8kbits/
frame= 197 fps=8.3 q=-0.0 Lsize= 4048kB time=00:00:23.63
bitrate=1403.2kbits
/s speed= 1x
video:598388kB audio:4048kB subtitle:0kB other streams:0kB global
headers:0kB mu
xing overhead: unknown
Exiting normally, received signal 2.
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