Issue 4994: subprocess (Popen) doesn't works properly (original) (raw)

Python 2.5.2 Ubuntu 8.04.1 64 bits

-- ATTEMPT 1 --

Python:

Popen(['mplayer','/tvixhd2/Pelis para montar/00049.m2ts','-msglevel all=4','-vo null','-ao null','-vf cropdetect','-vid 4113','-frames 500'])

stdout & stderr:

Option vf cropdetect: unknown postfix cropdetect Supported postfixes are: vf-add Append the given list to the current list vf-pre Prepend the given list to the current list vf-del x,y,... Remove the given elements. Take the list element index (starting from 0). Negative index can be used (i.e. -1 is the last element) vf-clr Clear the current list. Error analizando la opción en la línea de comandos: -msglevel all=4 MPlayer dev-SVN-r28340-4.2.4 (C) 2000-2009 MPlayer Team CPU: Intel(R) Core(TM)2 Quad CPU Q9550 @ 2.83GHz (Family: 6, Model: 23, Stepping: 10) CPUflags: MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1 Compilado para CPU x86 con extensiones: MMX MMX2 SSE SSE2

In this first example, I get severals errors from ¿python? and then python executes mplayer without parameters ¿?

-- ATTEMPT 2 --

Python:

Popen(args=['/tvixhd2/Pelis para montar/00049.m2ts','-msglevel all=4','-vo null','-ao null','-vf cropdetect','-vid 4113','-frames 500'], executable='mplayer')

stdout & stderr:

Option vf cropdetect: unknown postfix cropdetect Supported postfixes are: vf-add Append the given list to the current list vf-pre Prepend the given list to the current list vf-del x,y,... Remove the given elements. Take the list element index (starting from 0). Negative index can be used (i.e. -1 is the last element) vf-clr Clear the current list. Error analizando la opción en la línea de comandos: -msglevel all=4 MPlayer dev-SVN-r28340-4.2.4 (C) 2000-2009 MPlayer Team CPU: Intel(R) Core(TM)2 Quad CPU Q9550 @ 2.83GHz (Family: 6, Model: 23, Stepping: 10) CPUflags: MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1 Compilado para CPU x86 con extensiones: MMX MMX2 SSE SSE2

The same result

-- ATTEMPT 3 --

Python:

Popen('mplayer /tvixhd2/Pelis para montar/00049.m2ts -msglevel all=4 -vo null -ao null -vf cropdetect -vid 4113 -frames 500')

stdout & stderr:

Traceback (most recent call last): File ".../temp/eclipse-workspace/gConvM2TS/src/gConvM2TS.py", line 858, in xml.signal_connect('on_btnCrop_pressed', lambda w: calcularCrop(ficheroEntrada)) File ".../temp/eclipse-workspace/gConvM2TS/src/gConvM2TS.py", line 810, in calcularCrop Popen('mplayer /tvixhd2/Pelis para montar/00049.m2ts -msglevel all=4 -vo null -ao null -vf cropdetect -vid 4113 -frames 500') File "/usr/lib/python2.5/subprocess.py", line 594, in init errread, errwrite) File "/usr/lib/python2.5/subprocess.py", line 1147, in _execute_child raise child_exception OSError: [Errno 2] No existe el fichero ó directorio

The error is now: "No such file or directory", What!? I don't understand nothing!

-- ATTEMPT 4 --

Python:

Popen(args='/tvixhd2/Pelis para montar/00049.m2ts -msglevel all=4 -vo null -ao null -vf cropdetect -vid 4113 -frames 500', executable='mplayer')

stdout & stderr:

MPlayer dev-SVN-r28340-4.2.4 (C) 2000-2009 MPlayer Team CPU: Intel(R) Core(TM)2 Quad CPU Q9550 @ 2.83GHz (Family: 6, Model: 23, Stepping: 10) CPUflags: MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1 Compilado para CPU x86 con extensiones: MMX MMX2 SSE SSE2

No error, but the command mplayer is executed without parameters, ¿?

This subprocess Module really works?

Python:

Popen(args='mplayer "/tvixhd2/Pelis para montar/00049.m2ts" -msglevel all=4 -vo null -ao null -vf cropdetect -vid 4113 -frames 500', shell=True)

With "shell=True" it works but I don't want to execute it in this manner, because thus Python creates two subprocess and it returns the PID of the open shell but not of the real process of Mplayer.

Please investigate a bit more before posting. Try the following:

Popen(['mplayer','/tvixhd2/Pelis para montar/00049.m2ts','-msglevel', 'all=4','-vo', 'null','-ao', 'null','-vf', 'cropdetect','-vid', '4113','-frames', '500'])