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• Streams mixed when using -filter_complex amerge in FFmpeg

  19 juin 2016, par BrainStone

  I am currently having issues with ffmpeg and one of its filters.

  I am trying to merge 2 audio streams of a video into one. for this purpose I tried this command :

  ffmpeg -i /home/maniaplanet/Videos/ManiaPlanet\ 2014-08-21\ 20-09-13-082.avi.output.mkv -filter_complex "[0:1][0:2] amerge=inputs=2"-c:v copy -c:a libvo_aacenc -b:a 256k /var/www/files/output.mp4

  But I get this output :

  ffmpeg version 1.0.10 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Jul 25 2014 07:50:40 with gcc 4.7 (Debian 4.7.2-5)
  
    configuration: --prefix=/usr --extra-cflags='-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security ' --extra-ldflags='-Wl,-z,relro' --cc='ccache cc' --enable-shared --enable-libmp3lame --enable-gpl --enable-nonfree --enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-x11grab --enable-libgsm --enable-libtheora --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-libspeex --enable-nonfree --disable-stripping --enable-libvpx --enable-libschroedinger --disable-encoder=libschroedinger --enable-version3 --enable-libopenjpeg --enable-librtmp --enable-avfilter --enable-libfreetype --enable-libvo-aacenc --disable-decoder=amrnb --enable-libvo-amrwbenc --enable-libaacplus --libdir=/usr/lib/x86_64-linux-gnu --disable-vda --enable-libbluray --enable-libcdio --enable-gnutls --enable-frei0r --enable-openssl --enable-libass --enable-libopus --enable-fontconfig --enable-libfdk-aac --enable-libdc1394 --disable-altivec --dis  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, matroska,webm, from '/home/maniaplanet/Videos/ManiaPlanet 2014-08-21 20-09-13-082.avi.output.mkv':
  
    Metadata:
  
      ISRC            : Video:RGB24 Audio0:Headset (2- Plantronics .Audio 655 DSP) Audio1:Headset (2- Plantronics .Audio 655 DSP)
  
      ENCODER         : Lavf55.37.100
  
    Duration: 01:49:48.47, start: 0.000000, bitrate: 3867 kb/s
  
      Stream #0:0: Video: h264 (High), yuv420p, 1280x1024, SAR 1:1 DAR 5:4, 30 fps, 30 tbr, 1k tbn, 60 tbc (default)
  
      Stream #0:1: Audio: mp3, 48000 Hz, stereo, s16, 320 kb/s (default)
  
      Stream #0:2: Audio: mp3, 48000 Hz, stereo, s16, 320 kb/s (default)
  
  File '/var/www/files/output.mp4' already exists. Overwrite ? [y/N] y
  
  Input channel layouts overlap: output layout will be determined by the number of distinct input channels
  
  [libvo_aacenc @ 0x7ae800] Unable to set encoding parameters
  
  Output #0, mp4, to '/var/www/files/output.mp4':
  
    Metadata:
  
      ISRC            : Video:RGB24 Audio0:Headset (2- Plantronics .Audio 655 DSP) Audio1:Headset (2- Plantronics .Audio 655 DSP)
  
      ENCODER         : Lavf55.37.100
  
      Stream #0:0: Audio: aac, 48000 Hz, 4.0, s16, 256 kb/s
  
      Stream #0:1: Video: h264, yuv420p, 1280x1024 [SAR 1:1 DAR 5:4], q=2-31, 30 fps, 90k tbn, 1k tbc (default)
  
  Stream mapping:
  
    Stream #0:1 (mp3) -> amerge:in0
  
    Stream #0:2 (mp3) -> amerge:in1
  
    amerge -> Stream #0:0 (libvo_aacenc)
  
    Stream #0:0 -> #0:1 (copy)
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  I think the important part is at the bottom :

  Stream mapping:
  
    Stream #0:1 (mp3) -> amerge:in0
  
    Stream #0:2 (mp3) -> amerge:in1
  
    amerge -> Stream #0:0 (libvo_aacenc)
  
    Stream #0:0 -> #0:1 (copy)

  It maps the video stream as the second stream and the audio gets first. How do i resolve this ? -map did not help. (Maybe I just used it wrong)

• How to extract key-frames closest to given frame numbers from H264 video with ffmpeg

  16 décembre 2016, par John Allard

  I know how to extract a set of frames as jpg files from a video using ffmpeg if you know the frame numbers (given below)

  Extracting Frames: [40, 59, 73, 110]
  
  /usr/bin/ffmpeg -y -hide_banner -nostats -loglevel error -i /home/pi/movie.mp4 -vf select='eq(n\,40)+eq(n\,59)+eq(n\,73)+eq(n\,110)',scale=640:-1 -vsync 0 /tmp/%04d.jpg

  That will extract frames [40, 59, 73, 110] as files /tmp/0000.jpg, /tmp/0001.jpg, etc.

  I also know how to extract all key frames for a given time interval :

  ffmpeg -ss  -i video.mp4 -t <duration> -q:v 2 -vf select="eq(pict_type\,PICT_TYPE_I)" -vsync 0 frame%03d.jpg
  
  </duration>

  That will get all I-frames from start_time through start_time+duration.

  But what I would like to do is give a list of frame numbers and have ffmpeg extract the closest key-frames to each frame-number. Is there a way to do this with ffmpeg or would I have to write my own program ontop of libavcodec to do this ?

• ffmpeg fails to connect to pulse audio when scheduled through cron

  4 février 2017, par Barrett

  I would like to start ffmpeg to capture audio from pulse through a cron task. I am currently running Linux arch 4.8.13-1-ARCH #1 SMP PREEMPT x86_64 GNU/Linux.

  $ ffmpeg

  ffmpeg version 3.2.2 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 6.2.1 (GCC) 20160830
  
    configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-avisynth --enable-avresample --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libass --enable-libbluray --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-netcdf --enable-shared --enable-version3 --enable-x11grab
  
    libavutil      55. 34.100 / 55. 34.100
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.100 / 57. 56.100
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libavresample   3.  1.  0 /  3.  1.  0
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100

  $ arecord -l

  **** List of CAPTURE Hardware Devices ****
  
  card 0: MID [HDA Intel MID], device 0: CX20583 Analog [CX20583 Analog]
  
    Subdevices: 1/1
  
    Subdevice #0: subdevice #0

  /usr/local/sbin/ffmpeg-audio

  #! /bin/sh
  
  SHELL=/bin/sh
  
  PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
  
  
  
  n=$(date +"%s")
  
  out="/home/user/audio/out"$n".mp3"
  
  
  
  cd /
  
  
  
  echo -e $USER" "$(id -u)"\n"$out"\n" > $out.txt
  
  
  
  /usr/bin/ffmpeg -y -f alsa -i pulse -t 5 -codec:a libmp3lame -q:a 9 "file:"$out

  $ crontab -l

  *   *   *   *   *   /usr/local/sbin/ffmpeg-audio

  $ journalctl -u cronie

  Feb 04 11:51:01 arch crond[8913]: pam_unix(crond:session): session opened for user user by (uid=0)
  
  Feb 04 11:51:01 arch CROND[8914]: (user) CMD (/usr/local/sbin/ffmpeg-audio)
  
  Feb 04 11:51:01 arch sudo[8919]:     user : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=/usr/bin/ffmpeg -y -f alsa -i pulse -t 5 -codec:a libmp3lame -q:a 9 file:/home/user/audio/out1486237861.mp3
  
  Feb 04 11:51:01 arch sudo[8919]: pam_unix(sudo:session): session opened for user root by (uid=0)
  
  Feb 04 11:51:01 arch CROND[8913]: (user) CMDOUT (ffmpeg version 3.2.2 Copyright (c) 2000-2016 the FFmpeg developers)
  
  Feb 04 11:51:01 arch CROND[8913]: (user) CMDOUT (  built with gcc 6.2.1 (GCC) 20160830)
  
  Feb 04 11:51:01 arch CROND[8913]: (user) CMDOUT (  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-avisynth --enable-avresample --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libass --enable-libbluray --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-netcdf --enable-shared --enable-version3 --enable-x11grab)
  
  Feb 04 11:51:01 arch CROND[8913]: (user) CMDOUT (  libavutil      55. 34.100 / 55. 34.100)
  
  Feb 04 11:51:01 arch CROND[8913]: (user) CMDOUT (  libavcodec     57. 64.101 / 57. 64.101)
  
  Feb 04 11:51:01 arch CROND[8913]: (user) CMDOUT (  libavformat    57. 56.100 / 57. 56.100)
  
  Feb 04 11:51:01 arch CROND[8913]: (user) CMDOUT (  libavdevice    57.  1.100 / 57.  1.100)
  
  Feb 04 11:51:01 arch CROND[8913]: (user) CMDOUT (  libavfilter     6. 65.100 /  6. 65.100)
  
  Feb 04 11:51:01 arch CROND[8913]: (user) CMDOUT (  libavresample   3.  1.  0 /  3.  1.  0)
  
  Feb 04 11:51:01 arch CROND[8913]: (user) CMDOUT (  libswscale      4.  2.100 /  4.  2.100)
  
  Feb 04 11:51:01 arch CROND[8913]: (user) CMDOUT (  libswresample   2.  3.100 /  2.  3.100)
  
  Feb 04 11:51:01 arch CROND[8913]: (user) CMDOUT (  libpostproc    54.  1.100 / 54.  1.100)
  
  Feb 04 11:51:01 arch CROND[8913]: (user) CMDOUT (ALSA lib pulse.c:243:(pulse_connect) PulseAudio: Unable to connect: Connection refused)
  
  Feb 04 11:51:01 arch CROND[8913]: (user) CMDOUT ()
  
  Feb 04 11:51:01 arch CROND[8913]: (user) CMDOUT ([alsa @ 0x55a46e0144a0] cannot open audio device pulse (Connection refused))
  
  Feb 04 11:51:01 arch CROND[8913]: (user) CMDOUT (pulse: Input/output error)
  
  Feb 04 11:51:01 arch sudo[8919]: pam_unix(sudo:session): session closed for user root
  
  Feb 04 11:51:01 arch CROND[8913]: pam_unix(crond:session): session closed for user user

  ffmpeg runs correctly from the command line and ’$ which ffmpeg-audio’ returns /usr/local/sbin/ffmpeg-audio, but ffmpeg returns

  ([alsa @ 0x55a46e0144a0] cannot open audio device pulse (Connection
  refused))

  when scheduled through cron.

  Any suggestions ?