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• Merging audio at specific time with ffmpeg

  19 octobre 2015, par Deepu

  I was trying to merge audio with ffmpeg with the following command but the audio is merging at starting point.

  ffmpeg -i output-1146.mp4 -i org-EOLWAudio.mp3 -filter_complex " [0:a]atrim=start=0,asetpts=PTS-STARTPTS[aud1]; [1:a]atrim=0:250,asetpts=PTS+100/TB[aud2]; [aud1][aud2]amix=inputs=2[aout]" -map 0:v -map "[aout]" -crf 24 -pix_fmt yuv420p -c:v libx264 -c:a aac -strict -2 -ac 2 output-1246.mp4

  With this command it is merging audio streams but not specified point of time.

  I want to merge audio of a mp3 file from 0 to 250 seconds audio to video
  Starting at 4th minute to 8.10 minute.

  Output :

  ffmpeg version 2.6.3 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
  
    configuration: --arch=x86_64 --optflags='-02 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --[aram=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-frei0r --enable-gnutls --enable-libass --enable-libcdio --enable-libdc1394 --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopencv --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --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
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output-1146.mp4':
  
  
  
  Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.25.101
  
    Duration: 00:15:03.80, start: 0.064000, bitrate: 212 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1366x768, 137 kb/s, 5 fps, 5 tbr, 10240 tbn, 10 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 16000 Hz, stereo, fltp, 116 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Input #1, mp3, from 'org-EOLWAudio.mp3':
  
    Metadata:
  
      novideocodec    : 0
  
      server          : Red5
  
      creationdate    : Wed Sep 23 15:51:29 IST 2015
  
      canSeekToEnd    : true
  
      encoder         : Lavf56.25.101
  
    Duration: 00:14:00.74, start: 0.069063, bitrate: 48 kb/s
  
      Stream #1:0: Audio: mp3, 16000 Hz, stereo, s16p, 48 kb/s
  
  
  
  [libx264 @ 0x9d67440] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 0x9d67440] profile High, level 3.2
  
  [libx264 @ 0x9d67440] 264 - core 142 r2389 956c8d8 - 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=6 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=5 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=24.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00

• ffmpeg set padding with different top and bottom bar background colors

  29 juin 2019, par Rehan

  Using this ffmpeg command to set the padding color :

  pad="max(iw\,ih):ow:(ow-iw)/2:(oh-ih)/2:black"

  

  but I want different color for top for example green
  and for bottom I want to set blue color.

  

  Appreciate the help.

• How to encode a .wmv file that XNA DirectShow will play properly ?

  19 juin 2013, par Mr Pie

  I'm playing around with XNA DirectShow to stream a video from a file rather than loading it into my project (I'm fully aware of the XNA MediaPlayer class by the way). It plays the sample video it came with no problem. When I try to make my own .wmv from a series of PNG files I have using ffmpeg the video plays but is all blue (should be mostly yellow). Pixel format wrong ? Wrong codec ? I'm certainly no expert in these waters..

  The sample video is a VC-1 WMV3 apparantly, and I don't think I can replicate that ? What encoding/codec/fileformat should I be using ?

  Also ! If transparent video background is possible, that would be amazing. Is it ?