stdout en temps réel et subprocess

Bonjour,
Je suis en train de programmer un GUI pour le soft ffmpeg
Je cherche a capturer en temps réelle la sortie que donne l exécution de la ligne de commande pour pouvoir mettre à jour une bar de progression.
voici mon problème:

Code:

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import subprocess,sys
 
command = "K:\\_RD\\_LVR_RD\\Batch\\encodage\\ffmpeg\\bin\\ffmpeg.exe -y -i L:\\test.avi -vcodec libx264 -vpre libx264-Medium -crf 10.2 -r 25 -acodec copy L:\\test_AVC_H264.avi"
 
process = subprocess.Popen(command, shell=True, stdout=subprocess.PIPE)
 
lineNumber=0    
while True:
    buff = process.stdout.readline()
    lineNumber=lineNumber+1
    print "lineNumber:  ",lineNumber
    if buff == '' and process.poll() != None: 
        break
    sys.stdout.write(buff)
 
process.wait()

Avec ce code la console imprime successivement et en temp reelle les premières lignes. Mais au moment de l encodage, les lignes ne s'impriment plus.
Ce n'est que lorsque l'encodage est terminer que le bloque avec toutes le info de progression s imprime.
Il m'est du coup impossible d'utiliser ces infos pour ma bar de progression.

Code:

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Buff--------------->ffmpeg version N-36193-gf514695, Copyright(c)2000-2011 the FFmpeg developers
Buff--------------->  built on Dec 26 2011 17:50:37 with gcc 4.6.2
Buff--------------->  configuration: --enable-gpl --enable-version3 --disable-w3 2threads --enable-runtime-cpudetect --enable-avisynth --enable-bzlib --enable-fr ei0r --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable libopenjpeg --enable-librtmp --enab le-libschroedinger --enable-libspeex --enable-libtheora --enable-libvo-aacenc -- enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enab le-libxavs --enable-libxvid --enable-zlib
Buff--------------->  libavutil      51. 33.100 / 51. 33.100
Buff--------------->  libavcodec     53. 48.100 / 53. 48.100
Buff--------------->  libavformat    53. 28.100 / 53. 28.100
Buff--------------->  libavdevice    53.  4.100 / 53.  4.100
Buff--------------->  libavfilter     2. 54.100 /  2. 54.100
Buff--------------->  libswscale      2.  1.100 /  2.  1.100
Buff--------------->  libswresample   0.  5.100 /  0.  5.100
Buff--------------->  libpostproc    51.  2.100 / 51.  2.100
Buff--------------->Input #0, avi, from 'L:\test.avi':
Buff--------------->  Metadata:
Buff--------------->    TCOD            : 71600000
Buff--------------->    TCDO            : 165600000
Buff--------------->  Duration: 00:00:09.40, start: 0.000000, bitrate: 1660532 k b/s Buff--------------->    Stream #0:0: Video: rawvideo, bgra, 1920x1080, 25 tbr, 2 5 tbn, 25 tbc Buff--------------->    Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 4 4100 Hz, 2 channels, s16, 1411 kb/s 
Buff--------------->Incompatible pixel format 'bgra' for codec 'libx264', auto-s electing format 'yuv420p'
Buff--------------->[buffer @ 038101C0] w:1920 h:1080 pixfmt:bgra tb:1/1000000 s ar:0/1 sws_param:
Buff--------------->[buffersink @ 03817D40] auto-inserting filter 'auto inserted  scale 0' between the filter 'src' and the filter 'out'
Buff--------------->[scale @ 03815400] w:1920 h:1080 fmt:bgra -> w:1920 h:1080 f mt:yuv420p flags:0x4
Buff--------------->[libx264 @ 03823BC0] using cpu capabilities: MMX2 SSE2Fast FastShuffle SSEMisalign LZCNT
Buff--------------->[libx264 @ 03823BC0] profile High, level 4.0
Buff--------------->Output #0, avi, to 'L:\test_AVC_H264.avi':
Buff--------------->  Metadata:
Buff--------------->    TCOD            : 71600000
Buff--------------->    TCDO            : 165600000
Buff--------------->    ISFT            : Lavf53.28.100
Buff--------------->    Stream #0:0: Video: h264 (H264 / 0x34363248), yuv420p, 1 920x1080, q=-1--1, 25 tbn, 25 tbc
Buff--------------->    Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 2 channels, 1411 kb/s
Buff--------------->Stream mapping:
Buff--------------->  Stream #0:0 -> #0:0 (rawvideo -> libx264)
Buff--------------->  Stream #0:1 -> #0:1 (copy)
Buff--------------->Press [q] to stop, [?] for help
Buff--------------->frame=    3 fps=  0 q=0.0 size=      10kBtime=00:00:00.00 b
frame=    7 fps=  7 q=0.0 size=      10kB time=00:00:00.00 bitrate=  0.0kbits/sframe=   13 fps=  8 q=0.0 size=      10kB time=00:00:00.00bitrate=   0.0kbits/s
frame=   19 fps=  9 q=0.0 size=      10kB time=00:00:00.00 bitrate=   0.0kbits/s
frame=   26 fps= 10 q=0.0 size=      10kB time=00:00:00.00 bitrate=   0.0kbits/sframe=   32 fps= 10 q=0.0 size=      10kB time=00:00:00.00 bitrate=   0.0kbits/s
frame=   38 fps= 10 q=0.0 size=      10kB time=00:00:00.00 bitrate=   0.0kbits/sframe=   44 fps= 10 q=0.0 size=   10kB time=00:00:00.00 bitrate=   0.0kbits/sframe=   46 fps=  9 q=0.0 size=      10kB time=00:00:00.00 bitrate=   0.0kbits/s
frame=   52 fps=  9 q=0.0 size=      10kB time=00:00:00.00 bitrate=   0.0kbits/s
frame=   58 fps= 10 q=0.0 size=      10kB time=00:00:00.00 bitrate=   0.0kbits/s
frame=   63 fps= 10 q=16.0 size=     694kB time=00:00:00.-4 bitrate=-142094.8kbi
frame=   66 fps=  9 q=16.0 size=    2627kB time=00:00:00.08 bitrate=268956.2kbit
frame=   71 fps=  9 q=16.0 size=    5886kB time=00:00:00.28 bitrate=172198.5kbit
frame=   75 fps=  9 q=16.0 size=    8459kB time=00:00:00.44 bitrate=157482.3kbit
frame=   80 fps=  9 q=16.0 size=   11686kB time=00:00:00.64 bitrate=149580.8kbit
frame=   85 fps=  9 q=16.0 size=   14916kB time=00:00:00.84 bitrate=145461.8kbit
frame=   89 fps=  9 q=16.0 size=   17479kB time=00:00:01.00 bitrate=143184.7kbit
frame=   94 fps=  9 q=16.0 size=   20664kB time=00:00:01.20 bitrate=141065.2kbit
frame=   99 fps=  9 q=16.0 size=   23816kB time=00:00:01.40 bitrate=139355.6kbit
frame=  102 fps=  9 q=16.0 size=   25713kB time=00:00:01.52 bitrate=138581.4kbit
frame=  107 fps=  9 q=16.0 size=   28857kB time=00:00:01.72 bitrate=137438.7kbit
frame=  111 fps=  8 q=16.0 size=   31387kB time=00:00:01.88 bitrate=136765.9kbit
frame=  115 fps=  8 q=16.0 size=   33912kB time=00:00:02.04 bitrate=136181.1kbit
frame=  120 fps=  8 q=16.0 size=   37078kB time=00:00:02.24 bitrate=135598.2kbit
frame=  122 fps=  8 q=13.0 size=   38327kB time=00:00:02.32 bitrate=135333.3kbit
frame=  127 fps=  8 q=16.0 size=   41480kB time=00:00:02.52 bitrate=134844.5kbit
frame=  132 fps=  8 q=16.0 size=   44605kB time=00:00:02.72 bitrate=134338.9kbit
frame=  137 fps=  8 q=16.0 size=   47670kB time=00:00:02.92 bitrate=133735.9kbit
frame=  143 fps=  8 q=16.0 size=   49062kB time=00:00:03.16 bitrate=127189.3kbit
frame=  147 fps=  8 q=16.0 size=   49660kB time=00:00:03.32 bitrate=122535.5kbit
frame=  150 fps=  8 q=16.0 size=   50113kB time=00:00:03.44 bitrate=119337.9kbit
frame=  153 fps=  8 q=16.0 size=   50554kB time=00:00:03.56 bitrate=116329.9kbit
frame=  158 fps=  8 q=16.0 size=   51305kB time=00:00:03.76 bitrate=111779.9kbit
frame=  164 fps=  8 q=16.0 size=   52194kB time=00:00:04.00 bitrate=106893.2kbit
frame=  171 fps=  8 q=16.0 size=   53217kB time=00:00:04.28 bitrate=101859.3kbit
frame=  178 fps=  8 q=16.0 size=   54253kB time=00:00:04.56 bitrate=97465.3kbits
frame=  184 fps=  8 q=16.0 size=   55146kB time=00:00:04.80 bitrate=94115.1kbits
frame=  191 fps=  8 q=16.0 size=   56196kB time=00:00:05.08 bitrate=90621.9kbits
frame=  197 fps=  9 q=16.0 size=   57070kB time=00:00:05.32 bitrate=87878.7kbits
frame=  201 fps=  9 q=16.0 size=   60562kB time=00:00:05.48 bitrate=90534.2kbits
frame=  205 fps=  8 q=16.0 size=   63805kB time=00:00:05.64 bitrate=92675.0kbits
frame=  208 fps=  8 q=16.0 size=   66233kB time=00:00:05.76 bitrate=94198.4kbits
frame=  212 fps=  8 q=16.0 size=   69450kB time=00:00:05.92 bitrate=96103.6kbits
frame=  216 fps=  8 q=16.0 size=   72664kB time=00:00:06.08 bitrate=97904.7kbits
frame=  220 fps=  8 q=16.0 size=   75857kB time=00:00:06.24 bitrate=99586.6kbits
frame=  224 fps=  8 q=16.0 size=   79033kB time=00:00:06.40 bitrate=101162.0kbit
frame=  229 fps=  8 q=16.0 size=   82996kB time=00:00:06.60 bitrate=103015.8kbit
frame=  232 fps=  8 q=16.0 size=   85355kB time=00:00:06.72 bitrate=104051.5kbit
frame=  235 fps=  6 q=-1.0 Lsize=  134980kB time=00:00:09.32 bitrate=118643.0kbi
ts/s
Buff--------------->video:133334kB audio:1619kB global headers:0kB muxing overhe
ad 0.019495%
Buff--------------->[libx264 @ 03823BC0] frame I:3     Avg QP:10.54  size:660722
 
Buff--------------->[libx264 @ 03823BC0] frame P:232   Avg QP:12.64  size:579965
 
Buff--------------->[libx264 @ 03823BC0] mb I  I16..4: 16.5% 59.2% 24.2%
Buff--------------->[libx264 @ 03823BC0] mb P  I16..4: 12.1% 48.3% 12.7%  P16..4
:  7.7% 10.8%  6.7%  0.0%  0.0%    skip: 1.7%
Buff--------------->[libx264 @ 03823BC0] 8x8 transform intra:66.0% inter:40.5%
Buff--------------->[libx264 @ 03823BC0] coded y,uvDC,uvAC intra: 96.5% 94.9% 93
.5% inter: 80.2% 82.4% 73.7%
Buff--------------->[libx264 @ 03823BC0] i16 v,h,dc,p:  6%  3% 47% 44%
Buff--------------->[libx264 @ 03823BC0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 12%
34%  5%  6%  6%  6%  5%  6%
Buff--------------->[libx264 @ 03823BC0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 11%
21%  8%  9%  9%  9%  7%  8%
Buff--------------->[libx264 @ 03823BC0] i8c dc,h,v,p: 72%  7% 10% 11%
Buff--------------->[libx264 @ 03823BC0] Weighted P-Frames: Y:0.0% UV:0.0%
Buff--------------->[libx264 @ 03823BC0] ref P L0: 41.1% 10.4% 30.3% 18.3%
Buff--------------->[libx264 @ 03823BC0] kb/s:116199.16

Salut,

Le script Python faisant en fonction des informations récupérées sur stdout, cela (me) laisse supposer que ffmpeg les envoie peut être sur stderr.

- W

J ai essayé ça:

Code:

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import subprocess,sys
 
command = "K:\\_RD\\_LVR_RD\\Batch\\encodage\\ffmpeg\\bin\\ffmpeg.exe -y -i L:\\test.avi -vcodec libx264 -vpre libx264-Medium -crf 10.2 -r 25 -acodec copy L:\\test_AVC_H264.avi"
 
process = subprocess.Popen(command, shell=False, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
 
#lineNumber=0    
while True:
    buff = process.stdout.readline()
    bufferr = process.stderr.readline()
    if bufferr == '' and process.poll() != None: 
        break
    sys.stdout.write("Buff--------------->"+buff)
    sys.stdout.write("Bufferr--------------->"+bufferr)
 
process.wait()

il me retourne cette erreur:
File "C:\Users\Lucasky\Desktop\testwexpect2.py", line 10, in <module>
bufferr = process.stderr.read()
AttributeError: 'NoneType' object has no attribute 'read'

Il ne sortirai donc rien en stderr???

Salut,
La documentation dit:

Citation:

Popen.stderr¶
If the stderr argument was PIPE, this attribute is a file object that provides error output from the child process. Otherwise, it is None.

Ce qui est cohérent avec:
Code:

1 2 bufferr = process.stderr.read() AttributeError: 'NoneType' object has no attribute 'read'
De là à conclure qu'il n'y a rien qui sort sur stderr...
- W

merci pour ta réponse,
j ai essayé ceci:

Code:

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import subprocess,sys
 
command = "K:\\_RD\\_LVR_RD\\Batch\\encodage\\ffmpeg\\bin\\ffmpeg.exe -y -i L:\\test.avi -vcodec libx264 -vpre libx264-Medium -crf 10.2 -r 25 -acodec copy L:\\test_AVC_H264.avi"
 
process = subprocess.Popen(command, shell=False, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
 
#lineNumber=0    
while True:
    buff = process.stdout.readline()
    try:
            bufferr = process.stderr.readline()
    except:
            bufferr = "no stderr"
    if buff == '' and process.poll() != None: 
        break
    sys.stdout.write("Buff--------------->"+buff+"\n")
    sys.stdout.write("Bufferr------------>"+bufferr+"\n")
 
process.wait()

dsl je debute...
Est ce que tu pensais plus a un code comme ceci pour récupérer le stderr ?
Quant j exécute ce denier la sorti stderr reste en None tout le long de l’exécution de la commande.
lucas

Si je peux me permettre il existe un wrapper pour ffmpeg --> pyffmpeg

merci fred
Je connaissais pas
Je vais regarder leurs code et voir comment ils procèdent
merci

Malheureusement les sources pyffmpeg ne sont pas dispo.
Impossible de voir comment ils ont procédé.

J'ai trouvé cette discution:
http://stackoverflow.com/questions/3...ess-in-windows

C'est exactement mon souci.
Les réponses ont l'air d avoir résolu le problème mais pour moi ça ne marche pas.
si qq un a une idée...
Lucas