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• Python - second subprocess won't open if I use sys.argv

  3 juin 2015, par Hyperion

  I’ve got a Python script which download a video using youtube-dl and then extract frames from it using ffmpeg. This is the code :

  def DownloadVideo():
  
      output_file = "/Users/francesco/Desktop/SOURCE/%(title)s-%(id)s.%(ext)s"
  
      check_call(["youtube-dl","--output", output_file, "--restrict-filenames", "-f", "best", sys.argv[1]])
  
  
  
  def ConvertVideo(video):
  
      DEST = "/Users/francesco/Desktop/OUTPUT"
  
      SOURCE = "/Users/francesco/Desktop/SOURCE"
  
      ffmpeg_path = "/Users/francesco/Desktop/ffmpeg/ffmpeg"
  
      video_path = SOURCE + "/" + video
  
      dest_path = DEST + "/" + os.path.splitext(video)[0] + "-%d.png"
  
      check_call([ffmpeg_path, "-v", "0", "-i", video_path, "-f", "image2", dest_path])
  
  
  
  def Main():
  
      DownloadVideo()
  
      for video in os.listdir("/Users/francesco/Desktop/SOURCE"):
  
         ConvertVideo(video)

  I run the command python myscript.py myvideolink and everything goes fine in the download process, but the ConvertVideo doesn’t start, it just get frozen for a couple of seconds and then the program exits.

  If I try to run the same command skipping the DownloadVideo() (with the video already downloaded in the folder) it doens’t work too, but if I use python myscript.py without the argv[1], the ffmpeg process works ! Why this happens ?

  Update : I’ve tried to remove the -v 0 option in ffmpeg to see what actually happens, ffmpeg process starts, but get frozen like this :

  ffmpeg version 2.6.2 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
  
    configuration: --prefix=/Volumes/Ramdisk/sw --enable-gpl --enable-pthreads --enable-version3 --enable-libspeex --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-avfilter --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-filters --enable-libgsm --enable-libvidstab --enable-libx265 --disable-doc --arch=x86_64 --enable-runtime-cpudetect
  
    libavutil      54. 20.100 / 54. 20.100
  
    libavcodec     56. 26.100 / 56. 26.100
  
    libavformat    56. 25.101 / 56. 25.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 11.102 /  5. 11.102
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100

  Update 2 : This code seems not to work too, so I deduce is an ffmpeg problem with sys.args ?

  import subprocess
  
  import os
  
  import sys
  
  
  
  variable = sys.argv[1]
  
  
  
  
  
  def ConvertVideo(video):
  
      DEST = '/Users/francesco/Desktop/OUTPUT'
  
      SOURCE = '/Users/francesco/Desktop/SOURCE'
  
      ffmpeg_path = '/Users/francesco/Desktop/PYVIDID/ffmpeg/ffmpeg'
  
      video_path = SOURCE + '/' + video
  
      dest_path = DEST + '/' + os.path.splitext(video)[0] + '-%d.png'
  
      subprocess.check_call(['ffmpeg', '-i', video_path,'-r', '1', '-f', 'image2', dest_path])
  
  
  
  def Main():
  
      #DownloadVideo()
  
      for video in os.listdir('/Users/francesco/Desktop/SOURCE'):
  
          if not video.startswith("."):
  
              ConvertVideo(video)

  I’m not even using the argv[1] but it still got stuck.

• Merge commit ’a6f19d6a9f8d1e08653d9d77581e8c823f4955c2’

  8 juin 2015, par Michael Niedermayer

  Merge commit ’a6f19d6a9f8d1e08653d9d77581e8c823f4955c2’
  * commit ’a6f19d6a9f8d1e08653d9d77581e8c823f4955c2’ :
  
    configure : Support MSVC 2015
  Conflicts :
  
  	configure
  
  	libavutil/internal.h
  Merged-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] configure
  • [DH] libavutil/internal.h

• ffmpeg how to convert stereo to mono using audio pan filter [migrated]

  5 juin 2015, par John T

  From the documentation, it looks like this should work :

  ffmpeg -i input.mp4 -af "pan=1c|c0=.5*c0+.5*c1" output.mp4

  The output is a video with no sound. When I do ffprobe, it says theres a audio mono track, but its only 2kbps.

  However, when I do it this way though, it seems to work and produce a video with a mono track :

  ffmpeg -i input.mp4 -ac 1 output.mp4

  Does anyone know the reason why the first way isn’t working for me ?

  Thanks !

  Adding Console output

  ffmpeg output :

  ffmpeg -loglevel verbose -i video_tong_hua.mp4 -af "pan=1c|c0=.5*c0+.5*c1" output.mp4
  
  ffmpeg version 2.3.3 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Feb 25 2015 23:01:46 with Apple LLVM version 6.0 (clang-600.0.56) (based on LLVM 3.5svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/2.3.3 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid
  
    libavutil      52. 92.100 / 52. 92.100
  
    libavcodec     55. 69.100 / 55. 69.100
  
    libavformat    55. 48.100 / 55. 48.100
  
    libavdevice    55. 13.102 / 55. 13.102
  
    libavfilter     4. 11.100 /  4. 11.100
  
    libavresample   1.  3.  0 /  1.  3.  0
  
    libswscale      2.  6.100 /  2.  6.100
  
    libswresample   0. 19.100 /  0. 19.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, matroska,webm, from 'video_tong_hua.mp4':
  
    Metadata:
  
      encoder         : google
  
    Duration: 00:06:18.38, start: 0.000000, bitrate: 283 kb/s
  
      Stream #0:0: Video: vp8, yuv420p, 322x240, SAR 1:1 DAR 161:120, 29.97 fps, 29.97 tbr, 1k tbn, 1k tbc (default)
  
      Stream #0:1: Audio: vorbis, 44100 Hz, stereo, fltp (default)
  
  [graph 0 input from stream 0:0 @ 0x7fc8235003a0] w:322 h:240 pixfmt:yuv420p tb:1/1000 fr:2997/100 sar:1/1 sws_param:flags=2
  
  [graph 1 input from stream 0:1 @ 0x7fc82340d320] tb:1/44100 samplefmt:fltp samplerate:44100 chlayout:0x3
  
  [audio format for output stream 0:1 @ 0x7fc82340d880] auto-inserting filter 'auto-inserted resampler 0' between the filter 'Parsed_pan_0' and the filter 'audio format for output stream 0:1'
  
  [Parsed_pan_0 @ 0x7fc82340da40] o0 = 0.5 i0 + 0.5 i1
  
  [auto-inserted resampler 0 @ 0x7fc82340ce40] ch:1 chl:1 channels fmt:fltp r:44100Hz -> ch:1 chl:mono fmt:s16 r:44100Hz
  
  [libx264 @ 0x7fc823826000] using SAR=1/1
  
  [libx264 @ 0x7fc823826000] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 0x7fc823826000] profile High, level 1.3
  
  [libx264 @ 0x7fc823826000] 264 - core 142 r2455 021c0dc - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'output.mp4':
  
    Metadata:
  
      encoder         : Lavf55.48.100
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 322x240 [SAR 1:1 DAR 161:120], q=-1--1, 29.97 fps, 11988 tbn, 29.97 tbc (default)
  
      Metadata:
  
        encoder         : Lavc55.69.100 libx264
  
      Stream #0:1: Audio: aac (libfaac) ([64][0][0][0] / 0x0040), 44100 Hz, mono, s16, 128 kb/s (default)
  
      Metadata:
  
        encoder         : Lavc55.69.100 libfaac
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (vp8 (native) -> h264 (libx264))
  
    Stream #0:1 -> #0:1 (vorbis (native) -> aac (libfaac))
  
  Press [q] to stop, [?] for help
  
  No more output streams to write to, finishing.e=00:06:06.87 bitrate= 132.5kbits/s     
  
  frame=11340 fps=992 q=-1.0 Lsize=    6514kB time=00:06:18.31 bitrate= 141.1kbits/s    
  
  video:5995kB audio:95kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 6.954813%
  
  Input file #0 (video_tong_hua.mp4):
  
    Input stream #0:0 (video): 11970 packets read (8625600 bytes); 11340 frames decoded; 
  
    Input stream #0:1 (audio): 23356 packets read (4543310 bytes); 23355 frames decoded (16675392 samples); 
  
    Total: 35326 packets (13168910 bytes) demuxed
  
  Output file #0 (output.mp4):
  
    Output stream #0:0 (video): 11340 frames encoded; 11340 packets muxed (6139214 bytes); 
  
    Output stream #0:1 (audio): 16285 frames encoded (16675392 samples); 16286 packets muxed (97733 bytes); 
  
    Total: 27626 packets (6236947 bytes) muxed
  
  [libx264 @ 0x7fc823826000] frame I:70    Avg QP:17.29  size:  7924
  
  [libx264 @ 0x7fc823826000] frame P:4501  Avg QP:21.54  size:  1006
  
  [libx264 @ 0x7fc823826000] frame B:6769  Avg QP:21.74  size:   156
  
  [libx264 @ 0x7fc823826000] consecutive B-frames: 16.7%  8.8%  7.4% 67.1%
  
  [libx264 @ 0x7fc823826000] mb I  I16..4: 37.6% 29.0% 33.4%
  
  [libx264 @ 0x7fc823826000] mb P  I16..4:  1.9%  2.5%  0.7%  P16..4: 23.3%  8.0%  4.1%  0.0%  0.0%    skip:59.4%
  
  [libx264 @ 0x7fc823826000] mb B  I16..4:  0.1%  0.1%  0.0%  B16..8: 17.1%  1.2%  0.2%  direct: 0.8%  skip:80.6%  L0:42.2% L1:52.9% BI: 4.8%
  
  [libx264 @ 0x7fc823826000] 8x8 transform intra:44.2% inter:55.4%
  
  [libx264 @ 0x7fc823826000] coded y,uvDC,uvAC intra: 33.9% 47.6% 18.3% inter: 5.4% 4.5% 1.1%
  
  [libx264 @ 0x7fc823826000] i16 v,h,dc,p: 57% 24% 16%  3%
  
  [libx264 @ 0x7fc823826000] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 18% 43%  3%  3%  4%  3%  4%  4%
  
  [libx264 @ 0x7fc823826000] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 30% 14%  4%  6%  6%  6%  5%  5%
  
  [libx264 @ 0x7fc823826000] i8c dc,h,v,p: 51% 30% 17%  3%
  
  [libx264 @ 0x7fc823826000] Weighted P-Frames: Y:1.6% UV:0.5%
  
  [libx264 @ 0x7fc823826000] ref P L0: 66.8% 17.2% 11.7%  4.3%  0.1%
  
  [libx264 @ 0x7fc823826000] ref B L0: 91.0%  7.4%  1.7%
  
  [libx264 @ 0x7fc823826000] ref B L1: 96.0%  4.0%
  
  [libx264 @ 0x7fc823826000] kb/s:129.79

  ffprobe output :

  ffprobe output.mp4 
  
  ffprobe version 2.3.3 Copyright (c) 2007-2014 the FFmpeg developers
  
    built on Feb 25 2015 23:01:46 with Apple LLVM version 6.0 (clang-600.0.56) (based on LLVM 3.5svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/2.3.3 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid
  
    libavutil      52. 92.100 / 52. 92.100
  
    libavcodec     55. 69.100 / 55. 69.100
  
    libavformat    55. 48.100 / 55. 48.100
  
    libavdevice    55. 13.102 / 55. 13.102
  
    libavfilter     4. 11.100 /  4. 11.100
  
    libavresample   1.  3.  0 /  1.  3.  0
  
    libswscale      2.  6.100 /  2.  6.100
  
    libswresample   0. 19.100 /  0. 19.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.48.100
  
    Duration: 00:06:18.38, start: 0.010227, bitrate: 141 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 322x240 [SAR 1:1 DAR 161:120], 129 kb/s, 29.97 fps, 29.97 tbr, 11988 tbn, 59.94 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 2 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  digitaltsai:videos jtsai$