title: ffmpeg - Audio Issues with TS File
body: <p>I am new to the world of ffmpeg, so I apologize in advance if this is a stupid question or request.</p>
  <p>I'm in the process of trying to convert a .ts file to a h264/mp4. I was able to successfully convert the video, however whenever I go to play the output file, the audio is weird. Most of the audio is only coming through the left channel. I noticed that the audio has multiple channels - 6 to be exact. And there are two audio streams as well. I'm assuming that this has something to do with it, but I am not sure what exactly to put in the command line to fix it.</p>
  <p>I was hoping there would be a way to copy the video stream from the mp4 I had already made with ffmpeg, and then replace the audio from that mp4 with the audio from the source ts file - preferably mixed down into regular stereo audio. It is quite a big file, so I would like to not have to convert the video stream again if I don't have to.</p>
  <p>Here is the media information from the source video.</p>
  <pre><code>General
  ID : 1 (0x1)
  Complete name : D:\88th Annual Christmas in Rockefeller Center.ts
  Format : MPEG-TS
  File size : 9.80 GiB
  Duration : 2 h 7 min
  Overall bit rate mode : Variable
  Overall bit rate : 11.0 Mb/s
  Law rating : None
  
  Video
  ID : 101 (0x65)
  Menu ID : 1 (0x1)
  Format : MPEG Video
  Format version : Version 2
  Format profile : Main@High
  Format settings : BVOP
  Format settings, BVOP : Yes
  Format settings, Matrix : Default
  Format settings, GOP : Variable
  Format settings, picture structure : Frame
  Codec ID : 2
  Duration : 2 h 7 min
  Bit rate mode : Variable
  Bit rate : 9 851 kb/s
  Maximum bit rate : 80.0 Mb/s
  Width : 1 920 pixels
  Height : 1 080 pixels
  Display aspect ratio : 16:9
  Active Format Description : Full frame 16:9 image
  Frame rate : 29.970 (30000/1001) FPS
  Color space : YUV
  Chroma subsampling : 4:2:0
  Bit depth : 8 bits
  Scan type : Interlaced
  Scan order : Top Field First
  Compression mode : Lossy
  Bits/(Pixel*Frame) : 0.159
  Time code of first frame : 00:00:00;00
  Time code source : Group of pictures header
  Stream size : 8.80 GiB (90%)
  
  Audio #1
  ID : 102 (0x66)
  Menu ID : 1 (0x1)
  Format : AC-3
  Format/Info : Audio Coding 3
  Commercial name : Dolby Digital
  Codec ID : 129
  Duration : 2 h 7 min
  Bit rate mode : Constant
  Bit rate : 384 kb/s
  Channel(s) : 6 channels
  Channel layout : L R C LFE Ls Rs
  Sampling rate : 48.0 kHz
  Frame rate : 31.250 FPS (1536 SPF)
  Compression mode : Lossy
  Delay relative to video : 32 ms
  Stream size : 351 MiB (3%)
  Language : English
  Service kind : Complete Main
  
  Audio #2
  ID : 7543 (0x1D77)
  Menu ID : 1 (0x1)
  Format : AC-3
  Format/Info : Audio Coding 3
  Commercial name : Dolby Digital
  Codec ID : 129
  Duration : 2 h 7 min
  Bit rate mode : Constant
  Bit rate : 192 kb/s
  Channel(s) : 2 channels
  Channel layout : L R
  Sampling rate : 48.0 kHz
  Frame rate : 31.250 FPS (1536 SPF)
  Compression mode : Lossy
  Delay relative to video : 11 ms
  Stream size : 176 MiB (2%)
  Language : Spanish
  Service kind : Complete Main
  
  Text #1
  ID : 101 (0x65)-CC1
  Menu ID : 1 (0x1)
  Format : EIA-608
  Muxing mode : A/53 / DTVCC Transport
  Muxing mode, more info : Muxed in Video #1
  Duration : 2 h 7 min
  Bit rate mode : Constant
  Stream size : 0.00 Byte (0%)
  CaptionServiceName : CC1
  
  Text #2
  ID : 101 (0x65)-1
  Menu ID : 1 (0x1)
  Format : EIA-708
  Muxing mode : A/53 / DTVCC Transport
  Muxing mode, more info : Muxed in Video #1
  Duration : 2 h 7 min
  Bit rate mode : Constant
  Stream size : 0.00 Byte (0%)
  </code></pre>