How to stop os.system() in Python?
Question:
I want to stop the cmd command after 12 seconds. How to stop it? My program doesn’t work.
import multiprocessing
import os
import time
def process():
os.system('ffmpeg -i rtsp://218.204.223.237:554/live/1/66251FC11353191F/e7ooqwcfbqjoo80j.sdp -c copy dump.mp4')
def stop():
time.sleep(12)
if __name__ == '__main__':
p = multiprocessing.Process(target=process, args=())
s = multiprocessing.Process(target=stop, args=())
p.start()
s.start()
s.join()
p.terminate()
I change my program follow Pedro’s suggusetion @Pedro Lobito ,but it still doesn`t work.
import shlex
import subprocess
import time
command_line = 'ffmpeg -i rtsp://218.204.223.237:554/live/1/66251FC11353191F/e7ooqwcfbqjoo80j.sdp -c copy dump.mp4'
proc = subprocess.Popen(shlex.split(command_line), shell=True)
print '1' * 50
time.sleep(2) # <-- sleep for 12''
print '2' * 50
proc.terminate() # <-- terminate the process
print '3' * 50
And the result in CMD is
D:wyxworkspacepythonffrstp>python test1.py
11111111111111111111111111111111111111111111111111
ffmpeg version N-75563-g235381e Copyright (c) 2000-2015 the FFmpeg developers
built with gcc 4.9.3 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-l
ibilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enab
le-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --en
able-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --ena
ble-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc
--enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enabl
e-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --ena
ble-decklink --enable-zlib
libavutil 55. 2.100 / 55. 2.100
libavcodec 57. 3.100 / 57. 3.100
libavformat 57. 2.100 / 57. 2.100
libavdevice 57. 0.100 / 57. 0.100
libavfilter 6. 8.100 / 6. 8.100
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.100 / 2. 0.100
libpostproc 54. 0.100 / 54. 0.100
Input #0, rtsp, from 'rtsp://218.204.223.237:554/live/1/66251FC11353191F/e7ooqwc
fbqjoo80j.sdp':
Metadata:
title : RTSP Session
comment : Jabsco Stream(JCO-jy9757acx1eve7nm-a104aea23c1e17bbc776656
f5069bbf7)
Duration: N/A, start: 0.000000, bitrate: N/A
Stream #0:0: Video: mpeg4 (Simple Profile), yuv420p, 352x288 [SAR 1:1 DAR 11
:9], 10k tbr, 90k tbn, 10k tbc
[mp4 @ 00bad520] Codec for stream 0 does not use global headers but container fo
rmat requires global headers
Output #0, mp4, to 'dump.mp4':
Metadata:
title : RTSP Session
comment : Jabsco Stream(JCO-jy9757acx1eve7nm-a104aea23c1e17bbc776656
f5069bbf7)
encoder : Lavf57.2.100
Stream #0:0: Video: mpeg4 ( [0][0][0] / 0x0020), yuv420p, 352x288 [SAR 1:1 D
AR 11:9], q=2-31, 10k tbr, 90k tbn, 90k tbc
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
[mp4 @ 00bad520] pts has no value
[mp4 @ 00bad520] Non-monotonous DTS in output stream 0:0; previous: 0, current:
0; changing to 1. This may result in incorrect timestamps in the output file.
[mp4 @ 00bad520] Non-monotonous DTS in output stream 0:0; previous: 1, current:
0; changing to 2. This may result in incorrect timestamps in the output file.
frame= 30 fps=0.0 q=-1.0 size= 63kB time=00:00:02.33 bitrate= 220.4kbits/
frame= 36 fps= 31 q=-1.0 size= 68kB time=00:00:02.95 bitrate= 187.9kbits/
frame= 42 fps= 24 q=-1.0 size= 73kB time=00:00:03.52 bitrate= 169.6kbits/
frame= 47 fps= 20 q=-1.0 size= 90kB time=00:00:04.10 bitrate= 178.9kbits/
frame= 53 fps= 19 q=-1.0 size= 95kB time=00:00:04.63 bitrate= 167.2kbits/
22222222222222222222222222222222222222222222222222
33333333333333333333333333333333333333333333333333
D:wyxworkspacepythonffrstp>frame= 58 fps= 17 q=-1.0 size= 99kB time=0
frame= 64 fps= 16 q=-1.0 size= 104kB time=00:00:05.72 bitrate= 149.0kbits/
frame= 70 fps= 15 q=-1.0 size= 122kB time=00:00:06.36 bitrate= 156.7kbits/
frame= 76 fps= 15 q=-1.0 size= 127kB time=00:00:06.92 bitrate= 150.2kbits/
frame= 82 fps= 14 q=-1.0 size= 132kB time=00:00:07.55 bitrate= 143.2kbits/
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 7 packets
frame= 86 fps= 13 q=-1.0 size= 135kB time=00:00:07.95 bitrate= 139.5kbits/
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 3 packets
Maybe ffmpeg can reconnection. Can I stop it like ‘Ctrl + C’?
When I press ‘Ctrl+C’,the result is
22222222222222222222222222222222222222222222222222
33333333333333333333333333333333333333333333333333
D:wyxworkspacepythonffrstp>frame= 58 fps= 17 q=-1.0 size= 99kB time=0
frame= 64 fps= 16 q=-1.0 size= 104kB time=00:00:05.72 bitrate= 149.0kbits/
frame= 70 fps= 15 q=-1.0 size= 122kB time=00:00:06.36 bitrate= 156.7kbits/
frame= 76 fps= 15 q=-1.0 size= 127kB time=00:00:06.92 bitrate= 150.2kbits/
frame= 82 fps= 14 q=-1.0 size= 132kB time=00:00:07.55 bitrate= 143.2kbits/
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 7 packets
frame= 86 fps= 13 q=-1.0 size= 135kB time=00:00:07.95 bitrate= 139.5kbits/
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 3 packets
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 1 packets
frame= 89 fps= 13 q=-1.0 size= 138kB time=00:00:08.35 bitrate= 135.3kbits/
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 1 packets
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 3 packets
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 5 packets
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 3 packets
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 1 packets
frame= 92 fps= 12 q=-1.0 size= 144kB time=00:00:09.15 bitrate= 128.7kbits/
frame= 93 fps= 11 q=-1.0 size= 145kB time=00:00:09.58 bitrate= 123.8kbits/
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 1 packets
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 2 packets
D:wyxworkspacepythonffrstp>[rtsp @ 00adb3e0] max delay reached. need to cons
ume packet
[NULL @ 00add8c0] RTP: missed 12 packets
frame= 96 fps= 11 q=-1.0 size= 148kB time=00:00:10.43 bitrate= 116.2kbits/
frame= 96 fps=9.2 q=-1.0 Lsize= 151kB time=00:00:10.43 bitrate= 118.3kbits
/s
video:148kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing o
verhead: 1.913398%
Exiting normally, received signal 2.
Answers:
os.systemdoes not provide pid of the child process.
Use subprocess module.
import subprocess
import time
proc = subprocess.Popen(['ffmpeg -i rtsp://218.204.223.237:554/live/1/66251FC11353191F/e7ooqwcfbqjoo80j.sdp -c copy dump.mp4'], shell=True)
time.sleep(12) # <-- sleep for 12''
proc.terminate() # <-- terminate the process
You can also use the -t argument, i.e.:
ffmpeg -t 12 -i rtsp://218.204.223.237:554/live/1/66251FC11353191F/e7ooqwcfbqjoo80j.sdp -c copy dump.mp4
I find a solution when I read ffmpeg documentation today use -t before -i the Time duration section in the ffmpeg-utils manual
Thanks for Pedro Lobito’s help.I hope everyone can document first and then ask question .
I want to stop the cmd command after 12 seconds. How to stop it? My program doesn’t work.
import multiprocessing
import os
import time
def process():
os.system('ffmpeg -i rtsp://218.204.223.237:554/live/1/66251FC11353191F/e7ooqwcfbqjoo80j.sdp -c copy dump.mp4')
def stop():
time.sleep(12)
if __name__ == '__main__':
p = multiprocessing.Process(target=process, args=())
s = multiprocessing.Process(target=stop, args=())
p.start()
s.start()
s.join()
p.terminate()
I change my program follow Pedro’s suggusetion @Pedro Lobito ,but it still doesn`t work.
import shlex
import subprocess
import time
command_line = 'ffmpeg -i rtsp://218.204.223.237:554/live/1/66251FC11353191F/e7ooqwcfbqjoo80j.sdp -c copy dump.mp4'
proc = subprocess.Popen(shlex.split(command_line), shell=True)
print '1' * 50
time.sleep(2) # <-- sleep for 12''
print '2' * 50
proc.terminate() # <-- terminate the process
print '3' * 50
And the result in CMD is
D:wyxworkspacepythonffrstp>python test1.py
11111111111111111111111111111111111111111111111111
ffmpeg version N-75563-g235381e Copyright (c) 2000-2015 the FFmpeg developers
built with gcc 4.9.3 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-l
ibilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enab
le-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --en
able-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --ena
ble-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc
--enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enabl
e-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --ena
ble-decklink --enable-zlib
libavutil 55. 2.100 / 55. 2.100
libavcodec 57. 3.100 / 57. 3.100
libavformat 57. 2.100 / 57. 2.100
libavdevice 57. 0.100 / 57. 0.100
libavfilter 6. 8.100 / 6. 8.100
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.100 / 2. 0.100
libpostproc 54. 0.100 / 54. 0.100
Input #0, rtsp, from 'rtsp://218.204.223.237:554/live/1/66251FC11353191F/e7ooqwc
fbqjoo80j.sdp':
Metadata:
title : RTSP Session
comment : Jabsco Stream(JCO-jy9757acx1eve7nm-a104aea23c1e17bbc776656
f5069bbf7)
Duration: N/A, start: 0.000000, bitrate: N/A
Stream #0:0: Video: mpeg4 (Simple Profile), yuv420p, 352x288 [SAR 1:1 DAR 11
:9], 10k tbr, 90k tbn, 10k tbc
[mp4 @ 00bad520] Codec for stream 0 does not use global headers but container fo
rmat requires global headers
Output #0, mp4, to 'dump.mp4':
Metadata:
title : RTSP Session
comment : Jabsco Stream(JCO-jy9757acx1eve7nm-a104aea23c1e17bbc776656
f5069bbf7)
encoder : Lavf57.2.100
Stream #0:0: Video: mpeg4 ( [0][0][0] / 0x0020), yuv420p, 352x288 [SAR 1:1 D
AR 11:9], q=2-31, 10k tbr, 90k tbn, 90k tbc
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
[mp4 @ 00bad520] pts has no value
[mp4 @ 00bad520] Non-monotonous DTS in output stream 0:0; previous: 0, current:
0; changing to 1. This may result in incorrect timestamps in the output file.
[mp4 @ 00bad520] Non-monotonous DTS in output stream 0:0; previous: 1, current:
0; changing to 2. This may result in incorrect timestamps in the output file.
frame= 30 fps=0.0 q=-1.0 size= 63kB time=00:00:02.33 bitrate= 220.4kbits/
frame= 36 fps= 31 q=-1.0 size= 68kB time=00:00:02.95 bitrate= 187.9kbits/
frame= 42 fps= 24 q=-1.0 size= 73kB time=00:00:03.52 bitrate= 169.6kbits/
frame= 47 fps= 20 q=-1.0 size= 90kB time=00:00:04.10 bitrate= 178.9kbits/
frame= 53 fps= 19 q=-1.0 size= 95kB time=00:00:04.63 bitrate= 167.2kbits/
22222222222222222222222222222222222222222222222222
33333333333333333333333333333333333333333333333333
D:wyxworkspacepythonffrstp>frame= 58 fps= 17 q=-1.0 size= 99kB time=0
frame= 64 fps= 16 q=-1.0 size= 104kB time=00:00:05.72 bitrate= 149.0kbits/
frame= 70 fps= 15 q=-1.0 size= 122kB time=00:00:06.36 bitrate= 156.7kbits/
frame= 76 fps= 15 q=-1.0 size= 127kB time=00:00:06.92 bitrate= 150.2kbits/
frame= 82 fps= 14 q=-1.0 size= 132kB time=00:00:07.55 bitrate= 143.2kbits/
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 7 packets
frame= 86 fps= 13 q=-1.0 size= 135kB time=00:00:07.95 bitrate= 139.5kbits/
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 3 packets
Maybe ffmpeg can reconnection. Can I stop it like ‘Ctrl + C’?
When I press ‘Ctrl+C’,the result is
22222222222222222222222222222222222222222222222222
33333333333333333333333333333333333333333333333333
D:wyxworkspacepythonffrstp>frame= 58 fps= 17 q=-1.0 size= 99kB time=0
frame= 64 fps= 16 q=-1.0 size= 104kB time=00:00:05.72 bitrate= 149.0kbits/
frame= 70 fps= 15 q=-1.0 size= 122kB time=00:00:06.36 bitrate= 156.7kbits/
frame= 76 fps= 15 q=-1.0 size= 127kB time=00:00:06.92 bitrate= 150.2kbits/
frame= 82 fps= 14 q=-1.0 size= 132kB time=00:00:07.55 bitrate= 143.2kbits/
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 7 packets
frame= 86 fps= 13 q=-1.0 size= 135kB time=00:00:07.95 bitrate= 139.5kbits/
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 3 packets
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 1 packets
frame= 89 fps= 13 q=-1.0 size= 138kB time=00:00:08.35 bitrate= 135.3kbits/
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 1 packets
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 3 packets
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 5 packets
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 3 packets
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 1 packets
frame= 92 fps= 12 q=-1.0 size= 144kB time=00:00:09.15 bitrate= 128.7kbits/
frame= 93 fps= 11 q=-1.0 size= 145kB time=00:00:09.58 bitrate= 123.8kbits/
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 1 packets
[rtsp @ 00adb3e0] max delay reached. need to consume packet
[NULL @ 00add8c0] RTP: missed 2 packets
D:wyxworkspacepythonffrstp>[rtsp @ 00adb3e0] max delay reached. need to cons
ume packet
[NULL @ 00add8c0] RTP: missed 12 packets
frame= 96 fps= 11 q=-1.0 size= 148kB time=00:00:10.43 bitrate= 116.2kbits/
frame= 96 fps=9.2 q=-1.0 Lsize= 151kB time=00:00:10.43 bitrate= 118.3kbits
/s
video:148kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing o
verhead: 1.913398%
Exiting normally, received signal 2.
os.systemdoes not provide pid of the child process.
Use subprocess module.
import subprocess
import time
proc = subprocess.Popen(['ffmpeg -i rtsp://218.204.223.237:554/live/1/66251FC11353191F/e7ooqwcfbqjoo80j.sdp -c copy dump.mp4'], shell=True)
time.sleep(12) # <-- sleep for 12''
proc.terminate() # <-- terminate the process
You can also use the -t argument, i.e.:
ffmpeg -t 12 -i rtsp://218.204.223.237:554/live/1/66251FC11353191F/e7ooqwcfbqjoo80j.sdp -c copy dump.mp4
I find a solution when I read ffmpeg documentation today use -t before -i the Time duration section in the ffmpeg-utils manual
Thanks for Pedro Lobito’s help.I hope everyone can document first and then ask question .