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• adding silent audio to mov in ffmpeg

  12 septembre 2016, par jon

  I’m trying to use ffmpeg to add a silent audio track to a MOV file.

  I created a silent audio track longer than the video, and intend to use the -shortest option with ffmpeg.

  Using SoX v14.3.1, I run this to generate a wav file :

  sox -n -r 44100 -b 16 -c 2 -L silence.wav trim 0.0 60.000
  
  
  
  # -n  = Sox's null file
  
  # -r = sample rate 
  
  # -b = bits per sample
  
  # -c = num of channels
  
  # -L = little endian
  
  # filename
  
  # trim - is an effect, args start and length.

  My basic ffmpeg command looks like this :

  ffmpeg -shortest \
  
  -i silence.wav -acodec pcm_s16le \
  
  -i vid_no_sound.mov -vcodec copy vid_with_sound.mov

  The result of this is :

  ffmpeg version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Aug 27 2012 13:11:25 with gcc 4.4.5
  
    configuration: --extra-cflags=-static --prefix=/root/ffmpeg_build/src/ffmpeg-0.11.1 --enable-bzlib --enable-gnutls --enable-libfreetype --enable-libmp3lame --enable-libdc1394 --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-openssl --enable-zlib --enable-gpl --enable-nonfree --enable-version3
  
    libavutil      51. 54.100 / 51. 54.100
  
    libavcodec     54. 23.100 / 54. 23.100
  
    libavformat    54.  6.100 / 54.  6.100
  
    libavdevice    54.  0.100 / 54.  0.100
  
    libavfilter     2. 77.100 /  2. 77.100
  
    libswscale      2.  1.100 /  2.  1.100
  
    libswresample   0. 15.100 /  0. 15.100
  
    libpostproc    52.  0.100 / 52.  0.100
  
  [wav @ 0x29ab2e0] max_analyze_duration 5000000 reached at 5015510
  
  Guessed Channel Layout for  Input Stream #0.0 : stereo
  
  Input #0, wav, from 'silence.wav':
  
    Duration: 00:01:00.00, bitrate: 1411 kb/s
  
      Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'vid_no_sound.mov':
  
    Metadata:
  
      major_brand     : qt
  
      minor_version   : 537199360
  
      compatible_brands: qt
  
      creation_time   : 2012-07-25 13:41:44
  
    Duration: 00:00:14.50, start: 0.000000, bitrate: 27457 kb/s
  
      Stream #1:0(eng): Video: qtrle (rle  / 0x20656C72), rgb24, 1920x1080, 27450 kb/s, SAR 1920:1920 DAR 16:9, 24 fps, 24 tbr, 24 tbn, 24 tbc
  
      Metadata:
  
        creation_time   : 2012-07-25 13:41:44
  
        handler_name    : Apple Alias Data Handler
  
      Stream #1:1(eng): Data: none (tmcd / 0x64636D74)
  
      Metadata:
  
        creation_time   : 2012-07-25 13:42:06
  
        handler_name    : Apple Alias Data Handler
  
        timecode        : 00:00:00:00
  
  File 'vid_with_sound.mov' already exists. Overwrite ? [y/N] y
  
  auto-inserting filter 'auto-inserted resampler 0' between the filter 'src' and the filter 'aformat'
  
  [aresample @ 0x2ab3b00] chl:stereo fmt:s16 r:44100Hz -> chl:stereo fmt:flt r:44100Hz
  
  [NULL @ 0x2994320] Codec is experimental but experimental codecs are not enabled, try -strict -2
  
  Output #0, mov, to 'vid_with_sound.mov':
  
      Stream #0:0(eng): Video: qtrle (rle  / 0x20656C72), rgb24, 1920x1080 [SAR 1920:1920 DAR 16:9], q=2-31, 27450 kb/s, 24 fps, 90k tbn, 24 tbc
  
      Metadata:
  
        creation_time   : 2012-07-25 13:41:44
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:1: Audio: none, 44100 Hz, stereo, flt, 128 kb/s
  
  Stream mapping:
  
    Stream #1:0 -> #0:0 (copy)
  
    Stream #0:0 -> #0:1 (pcm_s16le -> aac)
  
  Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height

  I have tried adding the -strict -2 as suggested, although I am not sure where to put it in the command line.

  I’ve spent two hours trying different things and reading ffmpeg documentation, but I’m still stuck.

  How do I add a silent audio track to a mov file ?

• NReco video to sequence of bitmaps

  15 octobre 2016, par Christine

  How can I convert video to a sequence of bitmaps ? I need every frame one by one and process them in memory (no disc output).

  I chose NReco.VideoConverter but not sure which method can do this. I understand that FFMpegConverter.GetVideoThumbnail() is useless, since you can extract image only based on time input.

  Can I use FFMpegConverter.ConvertMedia() ? Please, how ? I’ve been searching for hours.

• NReco video to bitmaps

  15 octobre 2016, par Christine

  please, how can I convert video to a sequence of bitmaps ? I need every frame one by one and process them in memory (no disc output). I chose NReco.VideoConverter but not sure which method can do this. I understand that $FFMpegConverter .GetVideoThumbnail()$ is uselless, since you can extract image only based on time input. Can I use $FFMpegConverter .ConvertMedia()$ ? Please, how ? I’ve been searching for hours.