I'm invoking ffmpeg
with subprocess.Popen
, and trying to capture the stderr
output and write it to logging
.
args = ['ffmpeg', '-i', path]
if start:
args += ['-ss', start]
if end:
args += ['-t', end]
args += [
'-vcodec', 'copy',
'-acodec', 'copy',
'-scodec', 'copy',
'-f', 'mpegts',
'-y', '/dev/stdout']
self.child = subprocess.Popen(
args,
stdin=open(os.devnull, 'rb'),
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
ffmpeg
generates a lot of configuration information like the following:
FFmpeg version 0.6.2-4:0.6.2-1ubuntu1,
Copyright (c) 2000-2010 the Libav
developers built on Mar 22 2011
15:55:04 with gcc 4.5.2
configuration:
–extra-version=4:0.6.2-1ubuntu1 –prefix=/usr –enable-avfilter –enable-avfilter-lavf –enable-vdpau –enable-bzlib –enable-libgsm –enable-libschroedinger –enable-libspeex –enable-libtheora –enable-libvorbis –enable-pthreads –enable-zlib –enable-libvpx –disable-stripping –enable-runtime-cpudetect –enable-vaapi –enable-gpl –enable-postproc –enable-swscale –enable-x11grab –enable-libdc1394 –enable-shared –disable-static WARNING: library configuration
mismatch libavutil configuration:
–extra-version=4:0.6.2-1ubuntu2 –prefix=/usr –enable-avfilter –enable-avfilter-lavf –enable-vdpau –enable-bzlib –enable-libdirac –enable-libgsm –enable-libopenjpeg –enable-libschroedinger –enable-libspeex –enable-libtheora –enable-libvorbis –enable-pthreads –enable-zlib –enable-libvpx –disable-stripping –enable-runtime-cpudetect –enable-vaapi –enable-libopenjpeg –enable-gpl –enable-postproc –enable-swscale –enable-x11grab –enable-libfaad –enable-libdirac –enable-libfaad –enable-libmp3lame –enable-librtmp –enable-libx264 –enable-libxvid –enable-libdc1394 –enable-shared –disable-static libavcodec configuration:
–extra-version=4:0.6.2-1ubuntu2 –prefix=/usr –enable-avfilter –enable-avfilter-lavf –enable-vdpau –enable-bzlib –enable-libdirac –enable-libgsm –enable-libopenjpeg –enable-libschroedinger –enable-libspeex –enable-libtheora –enable-libvorbis –enable-pthreads –enable-zlib –enable-libvpx –disable-stripping –enable-runtime-cpudetect –enable-vaapi –enable-libopenjpeg –enable-gpl –enable-postproc –enable-swscale –enable-x11grab –enable-libfaad –enable-libdirac –enable-libfaad –enable-libmp3lame –enable-librtmp –enable-libx264 –enable-libxvid –enable-libdc1394 –enable-shared –disable-static libavutil 50.15. 1 / 50.15. 1
libavcodec 52.72. 2 / 52.72. 2
libavformat 52.64. 2 / 52.64. 2
libavdevice 52. 2. 0 / 52. 2. 0
libavfilter 1.19. 0 / 1.19. 0
libswscale 0.11. 0 / 0.11. 0
libpostproc 51. 2. 0 / 51. 2. 0
Prior to finally outputting the stuff I'd like to log:
Seems stream 0 codec frame rate
differs from container frame rate:
47.95 (66893/1395) -> 23.98 (66893/2790) At least one output file
must be specified
Is there an option to prevent this excessive output? Should I be doing it differently?
Best Answer
This is now possible as of FFmpeg 2.2 with the
-hide_banner
option. See also the relevant commit and ticket.