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• Combine 2 .FLV videos

  4 décembre 2015, par Rune

  For the last 4 hours I’ve been trying to combine 2 .flv files into one using ffmpeg (or well, just C# in general).

  Here’s what I got so far :
  I’ve converted both the videos to .mp4 videos :

  "-i " + videoFileLocation + " -c copy -copyts " + newConvertedFileLocation

  I have then combined the two .mp4 files into a single one using :
  (txtPath is the text file with the two mp4 file locations)

  "-f concat -i " + txtPath + " -c copy " + saveLocation

  This ends up with an mp4 file which contains the combination of both the videos BUT with the following fault :

  The length of the first video is 0:05

  The length of the second video is 6:11

  However the length of the combined video is for some reason 07:51 - thus the video runs at a slower pace than it should.

  Furthermore the audio is async with the video.

  What am I doing wrong here ?

  I haven’t used ffmpeg before and I just wanna get this working.

  Any help is greatly appreciated !

  As requested here is the output from running ’ffmpeg -i input1.flv -i input2.flv’ :

  ffmpeg version 2.7 Copyright (c) 2000-2015 the FFmpeg developers   built with gcc 4.9.2 (GCC)...
  
  
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'filepath\input1.flv':   Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      creation_time   : 1970-01-01 00:00:00
  
      encoder         : Lavf53.24.2   Duration: 00:00:05.31, start: 0.000000, bitrate: 1589 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1205 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 384 kb/s (default)
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : SoundHandler Input #1, flv, from 'filepath\input2.flv':   Metadata:
  
      audiosize       : 4476626
  
      canSeekToEnd    : true
  
      datasize        : 23876671
  
      videosize       : 19004263
  
      hasAudio        : true
  
      hasCuePoints    : false
  
      hasKeyframes    : true
  
      hasMetadata     : true
  
      hasVideo        : true
  
      lasttimestamp   : 372
  
      metadatacreator : flvtool++ (Facebook, Motion project, dweatherford)
  
      totalframes     : 9298
  
      encoder         : Lavf56.36.100   Duration: 00:06:11.92, start: 0.080000, bitrate: 513 kb/s
  
      Stream #1:0: Video: h264 (High), yuv420p, 646x364 [SAR 1:1 DAR 323:182], 400 kb/s, 25 fps, 25 tbr, 1k tbn, 50 tbc
  
      Stream #1:1: Audio: aac (LC), 44100 Hz, stereo, fltp, 96 kb/s At least one output file must be specified

• capture video with kinect using libfreenect

  20 avril 2016, par Sadra Naddaf

  i m trying to use kinect to capture video for video/image processing purposes
  i found there is an script in libfreenect/build/bin folder named fakenect-record can do this for me

  when i use it,it start capturing rgb and depth data in ppm and pgm format(both are images) and also it has an option (-ffmpeg) witch make an avi file of video but the problem is when I that it it fails and says this error :

  Depth Mode: {256, 1, {0}, 614400, 640, 480, 11, 5, 30, 1}
  
  Video Mode: {256, 1, {0}, 921600, 640, 480, 24, 0, 30, 1}
  
  [Stream 70] Expected 1748 data bytes, but got 948
  
  ffmpeg -pix_fmt rgb24 -s 640x480 -f rawvideo -i /dev/stdin -aspect 4:3 -r 20 -vcodec msmpeg4 -b 30000k sadra-depth.avi
  
  ffmpeg -pix_fmt rgb24 -s 640x480 -f rawvideo -i /dev/stdin -aspect 4:3 -r 20 -vcodec msmpeg4 -b 30000k sadra-rgb.avi
  
  ffmpeg version N-76045-g97be5d4ffmpeg version N-76045-g97be5d4 Copyright (c) 2000-2015 the FFmpeg developers Copyright (c) 2000-2015 the FFmpeg developers
  
  
  
    built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
  
    configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libdcadec --enable-libfreetype --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvo-aacenc --enable-libvidstab
  
    built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
  
    configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libdcadec --enable-libfreetype --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvo-aacenc --enable-libvidstab
  
    libavutil      55.  4.100 / 55.  4.100
  
    libavutil      55.  4.100 / 55.  4.100
  
    libavcodec     57.  6.100 / 57.  6.100
  
    libavcodec     57.  6.100 / 57.  6.100
  
    libavformat    57.  4.100 / 57.  4.100
  
    libavformat    57.  4.100 / 57.  4.100
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6. 11.100 /  6. 11.100
  
    libavfilter     6. 11.100 /  6. 11.100
  
    libavresample   3.  0.  0 /  3.  0.  0
  
    libavresample   3.  0.  0 /  3.  0.  0
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.100 /  2.  0.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
    libswresample   2.  0.100 /  2.  0.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Segmentation fault (core dumped)
  
  root@thispc-sns:~/Documents/libfreenect/build/bin/Untitled Folder# Input #0, rawvideo, from '/dev/stdin':
  
    Duration: N/A, bitrate: 184320 kb/s
  
      Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 640x480, 184320 kb/s, 25 tbr, 25 tbn, 25 tbc
  
  Please use -b:a or -b:v, -b is ambiguous
  
  Input #0, rawvideo, from '/dev/stdin':
  
    Duration: N/A, start: 0.000000, bitrate: 184320 kb/s
  
      Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 640x480, 184320 kb/s, 25 tbr, 25 tbn, 25 tbc
  
  Please use -b:a or -b:v, -b is ambiguous
  
  Output #0, avi, to 'sadra-depth.avi':
  
  Output #0, avi, to 'sadra-rgb.avi':
  
    Metadata:
  
      ISFT            :   Metadata:
  
      ISFT            : Lavf57.4.100Lavf57.4.100
  
  
  
      Stream #0:0    Stream #0:0: Video: msmpeg4v3 (msmpeg4) (MP43 / 0x3334504D), yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=2-31, 30000 kb/s: Video: msmpeg4v3 (msmpeg4) (MP43 / 0x3334504D), yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=2-31, 30000 kb/s, , 20 fps, 20 fps, 20 tbn, 20 tbn, 20 tbc20 tbc
  
  
  
      Metadata:
  
      Metadata:
  
        encoder         : Lavc57.6.100 msmpeg4      encoder         : Lavc57.6.100 msmpeg4
  
  Stream mapping:
  
  
  
    Stream #0:0 -> #0:0Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> msmpeg4v3 (msmpeg4))
  
   (rawvideo (native) -> msmpeg4v3 (msmpeg4))
  
  ***[rawvideo @ 0x2a31ce0] Invalid buffer size, packet size 483328 < expected frame_size 921600
  
  Error while decoding stream #0:0: Invalid argument
  
  frame=    0 fps=0.0 q=0.0 Lsize=       6kB time=00:00:00.00*** bitrate=N/A    
  
  video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)
  
  frame=    0 fps=0.0 q=0.0 Lsize=       6kB time=00:00:00.00 bitrate=N/A    
  
  video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)
  
  Conversion failed!

• ffmpeg replace part of audio file with looped audio gives queued buffers

  1er décembre 2015, par user1202648

  I am quite new to ffmpeg and I am trying to replace a part of a first audio file with another second file. The second file can be too short, so some sort of loop should exist.

  After some research I came up with the following command arguments and it gives me the output as long as I only do one replacement. But I would like to do multiple replacements. So any help on what I am doing wrong ? Any suggestions/remarks on the way of working are also very welcome.

  (Any typos in the commands below can be ignored, I generate the command by script and for ease of use I simplified the names.)

  Works (One replacement) :

  "ffmpeg.exe" -y -i "first.wav" -i "second.wav" -filter_complex "[1:a][1:a][1:a]concat=n=3:v=0:a=1,asetpts=PTS-STARTPTS[replaceBase];[0:a]atrim=0:3,asetpts=PTS-STARTPTS[partA];[replaceBase]atrim=0:2,asetpts=PTS-STARTPTS[replaceA];[0:a]atrim=start=5,asetpts=PTS-STARTPTS[partB];[partA][replaceA][partB]concat=n=3:v=0:a=1[aout]" -map "[aout]" Out.wav

  Works Not (Multiple replacements) :

  "ffmpeg.exe" -y -i "first.wav" -i "second.wav" -filter_complex "[1:a][1:a][1:a]concat=n=3:v=0:a=1,asetpts=PTS-STARTPTS[replaceBase];[0:a]atrim=0:3,asetpts=PTS-STARTPTS[partA];[replaceBase]atrim=0:2,asetpts=PTS-STARTPTS[replaceA];[0:a]atrim=5:4,asetpts=PTS-STARTPTS[partB];[replaceBase]atrim=0:2,asetpts=PTS-STARTPTS[replaceB];[0:a]atrim=start=6,asetpts=PTS-STARTPTS[partC];[partA][replaceA][partB][replaceB][PartC]concat=n=4:v=0:a=1[aout]" -map "[aout]" Out.wav

  ffmpeg version N-76860-g72eaf72 Copyright (c) 2000-2015 the FFmpeg developers
  built with gcc 5.2.0 (GCC)
  configuration : —enable-gpl —enable-version3 —disable-w32threads —enable-avisynth —enable-bzlib —enable-fontconfig —enable-frei0r —enable-gnutls —enable-iconv —enable-libass —enable-libbluray —enable-libbs2b —enable-libcaca —enable-libdcadec —enable-libfreetype —enable-libgme —enable-libgsm —enable-libilbc —enable-libmodplug —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenjpeg —enable-libopus —enable-librtmp —enable-libschroedinger —enable-libsoxr —enable-libspeex —enable-libtheora —enable-libtwolame —enable-libvidstab —enable-libvo-aacenc —enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libwavpack —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxavs —enable-libxvid —enable-libzimg —enable-lzma —enable-decklink —enable-zlib
  libavutil 55. 9.100 / 55. 9.100
  libavcodec 57. 16.100 / 57. 16.100
  libavformat 57. 19.100 / 57. 19.100
  libavdevice 57. 0.100 / 57. 0.100
  libavfilter 6. 15.100 / 6. 15.100
  libswscale 4. 0.100 / 4. 0.100
  libswresample 2. 0.101 / 2. 0.101
  libpostproc 54. 0.100 / 54. 0.100
  Guessed Channel Layout for Input Stream #0.0 : stereo
  Input #0, wav, from ’3897583stereo.wav’ :
  Duration : 00:00:12.07, bitrate : 256 kb/s
  Stream #0:0 : Audio : pcm_s16le ([1][0][0][0] / 0x0001), 8000 Hz, 2 channels, s16, 256 kb/s
  Guessed Channel Layout for Input Stream #1.0 : stereo
  Input #1, wav, from ’beep-021.wav’ :
  Metadata :
  encoder : Lavf57.19.100
  Duration : 00:00:00.30, bitrate : 1413 kb/s
  Stream #1:0 : Audio : pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 2 channels, s16, 1411 kb/s
  [wav @ 057242c0] Invalid stream specifier : replaceBase.
  Last message repeated 1 times
  Stream specifier ’STREAM CUT matches no streams.

  Thanks in advance !