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  • ffmpeg python subprocess error only on ubuntu

    10 décembre 2018, par Wonger

    Im working on an application that is splitting videos from youtube into images. I work on a macbook pro for development, but our app servers run on an ubuntu 12.04 server. The current code on our servers running right now is the following

    ffmpeg -i {video_file} -vf fps={fps}

    which we run via a subprocess Popen function call in python. This has very slow performance because it is essentially playing back the whole video file to get the frames. I found another SO post that said you could use -accurate_seek -ss to grab single frames at a specific time, but I am facing some issues with that. When i run the command via command line when SSH into our dev server, it works fine, but when i run it via a subprocess Popen call in python, i get the following error :

    (standard_in) 1: syntax error
    
ffmpeg version 3.2.4-static http://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2017 the FFmpeg developers
    
  built with gcc 5.4.1 (Debian 5.4.1-5) 20170205
    
  configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-5 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gray --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg
    
  libavutil      55. 34.101 / 55. 34.101
    
  libavcodec     57. 64.101 / 57. 64.101
    
  libavformat    57. 56.101 / 57. 56.101
    
  libavdevice    57.  1.100 / 57.  1.100
    
  libavfilter     6. 65.100 /  6. 65.100
    
  libswscale      4.  2.100 /  4.  2.100
    
  libswresample   2.  3.100 /  2.  3.100
    
  libpostproc    54.  1.100 / 54.  1.100
    
Option accurate_seek (enable/disable accurate seeking with -ss) cannot be applied to output url test.mkv -- you are trying to apply an input option to an output file or vice versa. Move this option before the file it belongs to.
    
Error parsing options for output file test.mkv.
    
Error opening output files: Invalid argument

    python code :

    import subprocess
    
command = "for i in {0..3} ; do ffmpeg -accurate_seek -ss `echo $i*60.0 | bc` -i test.mkv -frames:v 1 images/test_img_$i.jpg ; done"
    
process = subprocess.Popen(command, stdout=subprocess.PIPE, stderr = subprocess.STDOUT, shell=True)
    
output = process.communicate()
    
print output[0].replace('\\n' , '\n')

    The thing is, when i run this on my OSX terminal, it works fine, but there is some issue with doing it in ubuntu. Does anyone have experience with this issue ?

    Output when i run the same exact code in osx :

    ffmpeg version 3.0.2 Copyright (c) 2000-2016 the FFmpeg developers
    
  built with Apple LLVM version 7.3.0 (clang-703.0.31)
    
  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.0.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-opencl --enable-libx264 --enable-libmp3lame --enable-libxvid --enable-libvpx --enable-vda
    
  libavutil      55. 17.103 / 55. 17.103
    
  libavcodec     57. 24.102 / 57. 24.102
    
  libavformat    57. 25.100 / 57. 25.100
    
  libavdevice    57.  0.101 / 57.  0.101
    
  libavfilter     6. 31.100 /  6. 31.100
    
  libavresample   3.  0.  0 /  3.  0.  0
    
  libswscale      4.  0.100 /  4.  0.100
    
  libswresample   2.  0.101 /  2.  0.101
    
  libpostproc    54.  0.100 / 54.  0.100
    
  Input #0, matroska,webm, from 'test.mkv':
    
  Metadata:
    
    COMPATIBLE_BRANDS: iso6avc1mp41
    
    MAJOR_BRAND     : dash
    
    MINOR_VERSION   : 0
    
    ENCODER         : Lavf57.25.100
    
  Duration: 00:02:10.20, start: 0.007000, bitrate: 2729 kb/s
    
    Stream #0:0: Video: h264 (High), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
    
    Metadata:
    
      HANDLER_NAME    : VideoHandler
    
      DURATION        : 00:02:10.172000000
    
    Stream #0:1(eng): Audio: opus, 48000 Hz, stereo, fltp (default)
    
    Metadata:
    
      DURATION        : 00:02:10.201000000
    
      [swscaler @ 0x7f9b4b008000] deprecated pixel format used, make sure you did set range correctly
    
Output #0, image2, to 'images/test_img_0.jpg':
    
  Metadata:
    
    COMPATIBLE_BRANDS: iso6avc1mp41
    
    MAJOR_BRAND     : dash
    
    MINOR_VERSION   : 0
    
    encoder         : Lavf57.25.100
    
    Stream #0:0: Video: mjpeg, yuvj420p(pc), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 23.98 fps, 23.98 tbn, 23.98 tbc (default)
    
    Metadata:
    
      HANDLER_NAME    : VideoHandler
    
      DURATION        : 00:02:10.172000000
    
      encoder         : Lavc57.24.102 mjpeg
    
    Side data:
    
      unknown side data type 10 (24 bytes)
    
      Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
    
  Press [q] to stop, [?] for help
    
frame=    1 fps=0.0 q=7.2 Lsize=N/A time=00:00:00.04 bitrate=N/A speed=   1x    
    
video:73kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
    
....

    One thing i forgot to mention is that on my mac i used homebrew to install ffmpeg, where as on Ubuntu i used a static build

    other stack overflow reference : Fastest way to extract frames using ffmpeg ?

  • ffmpeg python subprocess error only on ubuntu

    19 avril 2017, par Wonger

    Im working on an application that is splitting videos from youtube into images. I work on a macbook pro for development, but our app servers run on an ubuntu 12.04 server. The current code on our servers running right now is the following

    ffmpeg -i {video_file} -vf fps={fps}

    which we run via a subprocess Popen function call in python. This has very slow performance because it is essentially playing back the whole video file to get the frames. I found another SO post that said you could use -accurate_seek -ss to grab single frames at a specific time, but I am facing some issues with that. When i run the command via command line when SSH into our dev server, it works fine, but when i run it via a subprocess Popen call in python, i get the following error :

    (standard_in) 1: syntax error
    
ffmpeg version 3.2.4-static http://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2017 the FFmpeg developers
    
  built with gcc 5.4.1 (Debian 5.4.1-5) 20170205
    
  configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-5 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gray --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg
    
  libavutil      55. 34.101 / 55. 34.101
    
  libavcodec     57. 64.101 / 57. 64.101
    
  libavformat    57. 56.101 / 57. 56.101
    
  libavdevice    57.  1.100 / 57.  1.100
    
  libavfilter     6. 65.100 /  6. 65.100
    
  libswscale      4.  2.100 /  4.  2.100
    
  libswresample   2.  3.100 /  2.  3.100
    
  libpostproc    54.  1.100 / 54.  1.100
    
Option accurate_seek (enable/disable accurate seeking with -ss) cannot be applied to output url test.mkv -- you are trying to apply an input option to an output file or vice versa. Move this option before the file it belongs to.
    
Error parsing options for output file test.mkv.
    
Error opening output files: Invalid argument

    python code :

    import subprocess
    
command = "for i in {0..3} ; do ffmpeg -accurate_seek -ss `echo $i*60.0 | bc` -i test.mkv -frames:v 1 images/test_img_$i.jpg ; done"
    
process = subprocess.Popen(command, stdout=subprocess.PIPE, stderr = subprocess.STDOUT, shell=True)
    
output = process.communicate()
    
print output[0].replace('\\n' , '\n')

    The thing is, when i run this on my OSX terminal, it works fine, but there is some issue with doing it in ubuntu. Does anyone have experience with this issue ?

    Output when i run the same exact code in osx :

    ffmpeg version 3.0.2 Copyright (c) 2000-2016 the FFmpeg developers
    
  built with Apple LLVM version 7.3.0 (clang-703.0.31)
    
  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.0.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-opencl --enable-libx264 --enable-libmp3lame --enable-libxvid --enable-libvpx --enable-vda
    
  libavutil      55. 17.103 / 55. 17.103
    
  libavcodec     57. 24.102 / 57. 24.102
    
  libavformat    57. 25.100 / 57. 25.100
    
  libavdevice    57.  0.101 / 57.  0.101
    
  libavfilter     6. 31.100 /  6. 31.100
    
  libavresample   3.  0.  0 /  3.  0.  0
    
  libswscale      4.  0.100 /  4.  0.100
    
  libswresample   2.  0.101 /  2.  0.101
    
  libpostproc    54.  0.100 / 54.  0.100
    
  Input #0, matroska,webm, from 'test.mkv':
    
  Metadata:
    
    COMPATIBLE_BRANDS: iso6avc1mp41
    
    MAJOR_BRAND     : dash
    
    MINOR_VERSION   : 0
    
    ENCODER         : Lavf57.25.100
    
  Duration: 00:02:10.20, start: 0.007000, bitrate: 2729 kb/s
    
    Stream #0:0: Video: h264 (High), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
    
    Metadata:
    
      HANDLER_NAME    : VideoHandler
    
      DURATION        : 00:02:10.172000000
    
    Stream #0:1(eng): Audio: opus, 48000 Hz, stereo, fltp (default)
    
    Metadata:
    
      DURATION        : 00:02:10.201000000
    
      [swscaler @ 0x7f9b4b008000] deprecated pixel format used, make sure you did set range correctly
    
Output #0, image2, to 'images/test_img_0.jpg':
    
  Metadata:
    
    COMPATIBLE_BRANDS: iso6avc1mp41
    
    MAJOR_BRAND     : dash
    
    MINOR_VERSION   : 0
    
    encoder         : Lavf57.25.100
    
    Stream #0:0: Video: mjpeg, yuvj420p(pc), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 23.98 fps, 23.98 tbn, 23.98 tbc (default)
    
    Metadata:
    
      HANDLER_NAME    : VideoHandler
    
      DURATION        : 00:02:10.172000000
    
      encoder         : Lavc57.24.102 mjpeg
    
    Side data:
    
      unknown side data type 10 (24 bytes)
    
      Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
    
  Press [q] to stop, [?] for help
    
frame=    1 fps=0.0 q=7.2 Lsize=N/A time=00:00:00.04 bitrate=N/A speed=   1x    
    
video:73kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
    
....

    One thing i forgot to mention is that on my mac i used homebrew to install ffmpeg, where as on Ubuntu i used a static build

    other stack overflow reference : Fastest way to extract frames using ffmpeg ?

  • Superimposing two videos onto a static image ?

    15 décembre 2014, par Archagon

    I have two videos that I’d like to combine into a single video, in which both videos would sit on top of a static background image. (Think something like this.) My requirements are that the software I use is free, that it runs on OSX, and that I don’t have to re-encode my videos an excessive number of times. I’d also like to be able to perform this operation from the command line or via script, since I’ll be doing it a lot. (But this isn’t strictly necessary.)

    I tried fiddling with ffmpeg for a couple of hours, but it just doesn’t seem very well suited for post-processing. I could potentially hack something together via the overlay feature, but so far I haven’t figured out how to do it, aside from pain-stakingly converting the image to a video (which takes 2x as long as the length of my videos !) and then superimposing the two videos onto it in another rendering step.

    Any tips ? Thank you !

    Update :

    Thanks to LordNeckbeard’s help, I was able to achieve my desired result with a single ffmpeg call ! Unfortunately, encoding is quite slow, taking 6 seconds to encode 1 second of video. I believe this is caused by the background image. Any tips on speeding up encoding ? Here’s the ffmpeg log :

    MacBook-Pro:Video archagon$ ffmpeg -loop 1 -i underlay.png -i test-slide-video-short.flv -i test-speaker-video-short.flv -filter_complex "[1:0]scale=400:-1[a];[2:0]scale=320:-1[b];[0:0][a]overlay=0:0[c];[c][b]overlay=0:0" -shortest -t 5 -an output.mp4
    
ffmpeg version 1.0 Copyright (c) 2000-2012 the FFmpeg developers
    
  built on Nov 14 2012 16:18:58 with Apple clang version 4.0 (tags/Apple/clang-421.0.60) (based on LLVM 3.1svn)
    
  configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libspeex --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid
    
  libavutil      51. 73.101 / 51. 73.101
    
  libavcodec     54. 59.100 / 54. 59.100
    
  libavformat    54. 29.104 / 54. 29.104
    
  libavdevice    54.  2.101 / 54.  2.101
    
  libavfilter     3. 17.100 /  3. 17.100
    
  libswscale      2.  1.101 /  2.  1.101
    
  libswresample   0. 15.100 /  0. 15.100
    
  libpostproc    52.  0.100 / 52.  0.100
    
Input #0, image2, from 'underlay.png':
    
  Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
    
    Stream #0:0: Video: png, rgb24, 1024x768, 25 fps, 25 tbr, 25 tbn, 25 tbc
    
Input #1, flv, from 'test-slide-video-short.flv':
    
  Metadata:
    
    author          : 
    
    copyright       : 
    
    description     : 
    
    keywords        : 
    
    rating          : 
    
    title           : 
    
    presetname      : Custom
    
    videodevice     : VGA2USB Pro V3U30343
    
    videokeyframe_frequency: 5
    
    canSeekToEnd    : false
    
    createdby       : FMS 3.5
    
    creationdate    : Mon Aug 16 16:35:34 2010
    
    encoder         : Lavf54.29.104
    
  Duration: 00:50:32.75, start: 0.000000, bitrate: 90 kb/s
    
    Stream #1:0: Video: vp6f, yuv420p, 640x480, 153 kb/s, 8 tbr, 1k tbn, 1k tbc
    
Input #2, flv, from 'test-speaker-video-short.flv':
    
  Metadata:
    
    author          : 
    
    copyright       : 
    
    description     : 
    
    keywords        : 
    
    rating          : 
    
    title           : 
    
    presetname      : Custom
    
    videodevice     : Microsoft DV Camera and VCR
    
    videokeyframe_frequency: 5
    
    audiodevice     : Microsoft DV Camera and VCR
    
    audiochannels   : 1
    
    audioinputvolume: 75
    
    canSeekToEnd    : false
    
    createdby       : FMS 3.5
    
    creationdate    : Mon Aug 16 16:35:34 2010
    
    encoder         : Lavf54.29.104
    
  Duration: 00:50:38.05, start: 0.000000, bitrate: 238 kb/s
    
    Stream #2:0: Video: vp6f, yuv420p, 320x240, 204 kb/s, 25 tbr, 1k tbn, 1k tbc
    
    Stream #2:1: Audio: mp3, 22050 Hz, mono, s16, 32 kb/s
    
File 'output.mp4' already exists. Overwrite ? [y/N] y
    
using cpu capabilities: none!
    
[libx264 @ 0x7fa84c02f200] profile High, level 3.1
    
[libx264 @ 0x7fa84c02f200] 264 - core 119 - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - 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=3 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         : Lavf54.29.104
    
    Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 1024x768, q=-1--1, 25 tbn, 25 tbc
    
Stream mapping:
    
  Stream #0:0 (png) -> overlay:main
    
  Stream #1:0 (vp6f) -> scale
    
  Stream #2:0 (vp6f) -> scale
    
  overlay -> Stream #0:0 (libx264)
    
Press [q] to stop, [?] for help

    Update 2 :

    It works ! One important tweak was to move the underlay.png input to the end of the input list. This increased performance substantially. Here’s my final ffmpeg call. (The maps at the end aren’t required for this particular arrangement, but I sometimes have a few extra audio inputs that I want to map to my output.)

    ffmpeg
    
    -i VideoOne.flv
    
    -i VideoTwo.flv
    
    -loop 1 -i Underlay.png
    
    -filter_complex "[2:0] [0:0] overlay=20:main_h/2-overlay_h/2 [overlay];[overlay] [1:0] overlay=main_w-overlay_w-20:main_h/2-overlay_h/2 [output]"
    
    -map [output]:v
    
    -map 0:a
    
    OutputVideo.m4v

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