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• How To Adjust Volume in An Audio Mix With Node Fluent-FFmpeg

  8 octobre 2015, par Alexander Perls

  I am using the node Fluent-FFmpeg library to mix together two audio files.

  My current code :

      var ffmpeg = require('fluent-ffmpeg');
  
      ffmpeg("/audioFileOne.wav")
  
              .input("/audioFileTwo.wav")
  
              .complexFilter('amix=duration=first')
  
              .audioFrequency(44100)
  
              .audioCodec('libmp3lame')
  
              .audioQuality(5)
  
              .output("/mixedFile.wav").run();
  
      }

  This works well. However, try as I might, I can’t figure out how to change the volume level of audioFileOne.wav before it is mixed with audioFileTwo.wav

  I am pretty sure I need to add something to this line

  .complexFilter('amix=duration=first')

  But I seem to be not smart enough to understand the ComplexFilter documentation on this page.

  If necessary I can provide some of the code that I have tried, but I don’t want to create more confusion.

• How can I encode a video to play on a DLink DSM-520 using FFMPEG ?

  4 octobre 2015, par tolsen64

  I have been searching, testing, and coming up with nothing for over a week. I want to use FFMPEG to convert mp4’s and mkv’s to AVI files that will play on my DLink DSM-520. Mencoder will do it. The files that FFMPEG generates cause the player to lock up less than a minute into the video. First, here’s what I use to encode the file using Mencoder (scraped from the test.bat file that PocketDIVXEncoder generates :

  mencoder.exe ftwd105.mp4 -af volnorm -srate 44100 -oac mp3lame -lameopts mode=0:cbr:br=128 -noodml -vf pp=ac,scale=720:404,crop=720:400,harddup -sws 9 -ovc lavc -lavcopts vcodec=mpeg4:mbd=1:last_pred=2:vstrict=1:threads=2:vmax_b_frames=0:vbitrate=1200 -ffourcc XVID -o ftwd105_HDTV.avi

  The output file plays perfectly on the DSM-520. Looking at the file using FFPROBE, I see this :

  Input #0, avi, from 'ftwd105_HDTV.avi':
  
    Metadata:
  
      encoder         : MEncoder Redxii-SVN-r37527-4.9.3 (x86_64)
  
    Duration: 00:44:32.96, start: 0.000000, bitrate: 1193 kb/s
  
      Stream #0:0: Video: mpeg4 (Simple Profile) (XVID / 0x44495658), yuv420p, 720x400 [SAR 1:1 DAR 9:5], 1053 kb/s, 23.98 fps, 23.98 tbr, 23.98 tbn, 24k tbc
  
      Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz, stereo, s16p, 128 kb/s

  So now I try the same thing with FFMPEG.

  ffmpeg -i ftwd105.mp4 -vcodec mpeg4 -vtag XVID -b:v 1200k -s 720x400 -acodec libmp3lame -ab 128k -ar 44100 -ac 2 -f avi ftwd105_ffmpeg.avi

  This file does not play on the media player. It plays choppy with only clicking for sound for about 15-30 seconds, then it freezes. Looking at it with FFPROBE, it looks exactly the same as the one created by Mencoder.

  Input #0, avi, from 'ftwd105_ffmpeg.avi':
  
    Metadata:
  
      encoder         : Lavf57.0.100
  
    Duration: 00:44:33.14, start: 0.000000, bitrate: 1305 kb/s
  
      Stream #0:0: Video: mpeg4 (Simple Profile) (XVID / 0x44495658), yuv420p, 720x400 [SAR 1:1 DAR 9:5], 1165 kb/s, 23.98 fps, 23.98 tbr, 23.98 tbn, 24k tbc
  
      Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz, stereo, s16p, 128 kb/s

  So now I encode the video using Xvid4PSP. It plays perfectly fine and FFPROBE shows this :

  Input #0, avi, from 'ftwd105_ps2.avi':
  
    Metadata:
  
      encoder         : VirtualDubMod 1.5.10.3 | www.virtualdub-fr.org || (build 2550/release)
  
    Duration: 00:44:33.09, start: 0.000000, bitrate: 861 kb/s
  
      Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 720x400 [SAR 1:1 DAR 9:5], 723 kb/s, 23.98 fps, 23.98 tbr, 23.98 tbn, 23.98 tbc
  
      Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p, 128 kb/s

  It’s using Advanced Simple Profile so I look this up and change my FFMPEG options :

  ffmpeg -i ftwd105.mp4 -vcodec mpeg4 -vtag XVID -b:v 1200k -s 720x400 -profile:v 15 -level 0 -acodec libmp3lame -ab 128k -ar 44100 -ac 2 -f avi ftwd105_ffmpeg.avi

  But though the output file looks the same using FFPROBE as the one made by Xvid4PSP, it still doesn’t play on the DSM-520.

  Input #0, avi, from 'ftwd105_ffmpeg_asp.avi':
  
    Metadata:
  
      encoder         : Lavf57.0.100
  
    Duration: 00:44:33.14, start: 0.000000, bitrate: 1305 kb/s
  
      Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 720x400 [SAR 1:1 DAR 9:5], 1165 kb/s, 23.98 fps, 23.98 tbr, 23.98 tbn, 24k tbc
  
      Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz, stereo, s16p, 128 kb/s

  So now i’m at a loss. Is FFMPEG incapable of generating a file that the DSM-520 can play ? The reason I want to use FFMPEG over Mencoder is that it’s much faster. What takes FFMPEG 15 minutes takes Mencoder 40.

  I should note that all the files created by FFMPEG play fine on the PC and on my Visio television. The DSM-520 is hooked up to a bedroom tv that isn’t a smart tv.

  Edit : I also tried libxvid in place of mpeg4 with the same results.

• movtextdec : Add support for automatic text wrapping

  14 août 2015, par Niklesh

  movtextdec : Add support for automatic text wrapping
  The value of wrap_flag in the Text Wrap Box specifies if the text is to
  
  be wrapped or not. Uses ’end of line wrap’ amongst the wrap styles
  
  supported by ASS if the text is to be wrapped, i.e ; fill as much text
  
  in a line as possible, then break to next line.
  The 3GPP spec has no provision for smart wrapping.
  Signed-off-by : Niklesh <niklesh.lalwani@iitb.ac.in>
  

  • [DH] libavcodec/movtextdec.c