I am attempting to call ffplay in Python using subprocess. When ffplay is called, it opens a window with the video and outputs information to the console until the window is closed. I'd like to scrap the output and return to the Python script while the video continues to play (i.e., not closing the window).
Currently, I have:
# some code
subprocess.call(['ffplay', 'video.mp4'])
# some more code
How do I change this code to keep the window up and send the process output to the background to continue with the Python script?
Thanks in advance!
EDIT
Try this,
p = subprocess.Popen(['ffplay', 'sample-mp4-file.mp4', '-autoexit'],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
universal_newlines=True) # This flag converts carriage return chars to new lines
while p.poll() is None: # While the process p is still running
line = p.stderr.readline()
print(line)
My output:
ffplay version 4.2.4-1ubuntu0.1 Copyright (c) 2003-2020 the FFmpeg developers
built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
configuration: --prefix=/usr --extra-version=1ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
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
nan : 0.000 fd= 0 aq= 0KB vq= 0KB sq= 0B f=0/0
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'sample-mp4-file.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
creation_time : 1970-01-01T00:00:00.000000Z
encoder : Lavf53.24.2
Duration: 00:02:05.95, start: 0.000000, bitrate: 669 kb/s
Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 320x240 [SAR 1:1 DAR 4:3], 282 kb/s, 15 fps, 15 tbr, 15360 tbn, 30 tbc (default)
Metadata:
creation_time : 1970-01-01T00:00:00.000000Z
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 383 kb/s (default)
Metadata:
creation_time : 1970-01-01T00:00:00.000000Z
handler_name : SoundHandler
-0.01 A-V: -0.034 fd= 0 aq= 137KB vq= 93KB sq= 0B f=0/0
0.04 A-V: -0.027 fd= 0 aq= 135KB vq= 93KB sq= 0B f=0/0
0.07 A-V: -0.024 fd= 0 aq= 137KB vq= 94KB sq= 0B f=0/0
0.11 A-V: -0.022 fd= 0 aq= 135KB vq= 94KB sq= 0B f=0/0
0.14 A-V: -0.020 fd= 0 aq= 136KB vq= 94KB sq= 0B f=0/0
0.18 A-V: -0.020 fd= 0 aq= 136KB vq= 94KB sq= 0B f=0/0
0.20 A-V: -0.027 fd= 0 aq= 137KB vq= 92KB sq= 0B f=0/0
0.24 A-V: -0.025 fd= 0 aq= 135KB vq= 92KB sq= 0B f=0/0
0.27 A-V: -0.023 fd= 0 aq= 136KB vq= 93KB sq= 0B f=0/0
0.31 A-V: -0.020 fd= 0 aq= 134KB vq= 93KB sq= 0B f=0/0
0.34 A-V: -0.020 fd= 0 aq= 137KB vq= 89KB sq= 0B f=0/0
0.37 A-V: -0.028 fd= 0 aq= 135KB vq= 89KB sq= 0B f=0/0
0.41 A-V: -0.025 fd= 0 aq= 136KB vq= 89KB sq= 0B f=0/0
0.44 A-V: -0.023 fd= 0 aq= 134KB vq= 89KB sq= 0B f=0/0
0.48 A-V: -0.020 fd= 0 aq= 135KB vq= 86KB sq= 0B f=0/0
0.51 A-V: -0.020 fd= 0 aq= 135KB vq= 86KB sq= 0B f=0/0
0.54 A-V: -0.028 fd= 0 aq= 137KB vq= 83KB sq= 0B f=0/0
0.57 A-V: -0.025 fd= 0 aq= 134KB vq= 83KB sq= 0B f=0/0
0.61 A-V: -0.023 fd= 0 aq= 137KB vq= 82KB sq= 0B f=0/0
0.64 A-V: -0.020 fd= 0 aq= 135KB vq= 82KB sq= 0B f=0/0
0.68 A-V: -0.020 fd= 0 aq= 138KB vq= 78KB sq= 0B f=0/0
0.70 A-V: -0.027 fd= 0 aq= 136KB vq= 78KB sq= 0B f=0/0
0.74 A-V: -0.025 fd= 0 aq= 138KB vq= 76KB sq= 0B f=0/0
0.77 A-V: -0.022 fd= 0 aq= 136KB vq= 76KB sq= 0B f=0/0
0.81 A-V: -0.020 fd= 0 aq= 139KB vq= 73KB sq= 0B f=0/0
0.84 A-V: -0.020 fd= 0 aq= 137KB vq= 73KB sq= 0B f=0/0
0.87 A-V: -0.027 fd= 0 aq= 138KB vq= 69KB sq= 0B f=0/0
0.90 A-V: -0.025 fd= 0 aq= 136KB vq= 69KB sq= 0B f=0/0
0.94 A-V: -0.023 fd= 0 aq= 138KB vq= 67KB sq= 0B f=0/0
0.97 A-V: -0.023 fd= 0 aq= 138KB vq= 67KB sq= 0B f=0/0
1.01 A-V: -0.020 fd= 0 aq= 139KB vq= 64KB sq= 0B f=0/0
1.03 A-V: -0.028 fd= 0 aq= 137KB vq= 64KB sq= 0B f=0/0
1.07 A-V: -0.025 fd= 0 aq= 138KB vq= 62KB sq= 0B f=0/0
1.10 A-V: -0.025 fd= 0 aq= 138KB vq= 62KB sq= 0B f=0/0
1.14 A-V: -0.023 fd= 0 aq= 140KB vq= 60KB sq= 0B f=0/0
1.17 A-V: -0.020 fd= 0 aq= 138KB vq= 60KB sq= 0B f=0/0
1.20 A-V: -0.028 fd= 0 aq= 139KB vq= 57KB sq= 0B f=0/0
1.23 A-V: -0.028 fd= 0 aq= 139KB vq= 57KB sq= 0B f=0/0
1.27 A-V: -0.025 fd= 0 aq= 140KB vq= 56KB sq= 0B f=0/0
1.30 A-V: -0.023 fd= 0 aq= 138KB vq= 56KB sq= 0B f=0/0
1.34 A-V: -0.020 fd= 0 aq= 139KB vq= 54KB sq= 0B f=0/0
I think this is what you are looking for.