[FFmpeg-user] Problem with converting to AVI (XVID-AC3) for Home Theatre

[Nithin C Babu]

I am using FFmpeg to convert a video file that has 5.1 surround sound for
playing it in a home theatre system. I used the following command.

ffmpeg -i "input1.mp4" -vf scale=720:-16 -c:v mpeg4 -vtag XVID -b:v 3000k
-c:a ac3 -b:a 448k "OUTPUT_FILE.avi"

I am able to play the video file on my computer. But, it has problems in
the home theatre system. The home theatre system is able to play the video,
but it is showing that the audio is not supported. I can't hear any sound.

When I use Avidemux with similar resolution and bitrate, it works well on
the Home Theatre system. I am including the MediaInfo outputs of both the
files below.

The file converted using FFmpeg:

General
Complete name               : F:\FFMPEG\ffmpegOut.avi
Format                      : AVI
Format/Info                 : Audio Video Interleave
File size                   : 2.93 MiB
Duration                    : 7 s 80 ms
Overall bit rate            : 3 471 kb/s
Writing application         : Lavf58.47.100

Video
ID                          : 0
Format                      : MPEG-4 Visual
Format profile              : Simple at L1
Format settings, BVOP       : No
Format settings, QPel       : No
Format settings, GMC        : No warppoints
Format settings, Matrix     : Default (H.263)
Codec ID                    : XVID
Codec ID/Hint               : XviD
Duration                    : 7 s 80 ms
Bit rate                    : 3 006 kb/s
Width                       : 720 pixels
Height                      : 336 pixels
Display aspect ratio        : 2.2:1
Frame rate                  : 25.000 FPS
Color space                 : YUV
Chroma subsampling          : 4:2:0
Bit depth                   : 8 bits
Scan type                   : Progressive
Compression mode            : Lossy
Bits/(Pixel*Frame)          : 0.497
Stream size                 : 2.54 MiB (87%)
Writing library             : Lavc58.93.100

Audio
ID                          : 1
Format                      : AC-3
Format/Info                 : Audio Coding 3
Codec ID                    : 00002000-0000-0010-8000-00AA00389B71
Duration                    : 7 s 8 ms
Bit rate                    : 448 kb/s
Channel(s)                  : 6 channels
Channel layout              : L R C LFE Ls Rs
Sampling rate               : 48.0 kHz
Bit depth                   : 16 bits
Compression mode            : Lossy
Stream size                 : 383 KiB (13%)
Interleave, duration        : 32  ms (0.81 video frame)
Interleave, preload duratio : 96  ms


The file converted using avidemux (which works):

General
Complete name               : F:\FFMPEG\aviDemux.avi
Format                      : AVI
Format/Info                 : Audio Video Interleave
File size                   : 2.07 MiB
Duration                    : 6 s 920 ms
Overall bit rate            : 2 513 kb/s

Video
ID                          : 0
Format                      : MPEG-4 Visual
Format profile              : Advanced Simple at L4
Format settings             : BVOP2
Format settings, BVOP       : 2
Format settings, QPel       : No
Format settings, GMC        : No warppoints
Format settings, Matrix     : Default (H.263)
Codec ID                    : XVID
Codec ID/Hint               : XviD
Duration                    : 6 s 920 ms
Bit rate                    : 1 713 kb/s
Width                       : 720 pixels
Height                      : 320 pixels
Display aspect ratio        : 2.25:1
Frame rate                  : 25.000 FPS
Color space                 : YUV
Chroma subsampling          : 4:2:0
Bit depth                   : 8 bits
Scan type                   : Progressive
Compression mode            : Lossy
Bits/(Pixel*Frame)          : 0.297
Stream size                 : 1.41 MiB (68%)
Writing library             : XviD 67

Audio
ID                          : 1
Format                      : AC-3
Format/Info                 : Audio Coding 3
Commercial name             : Dolby Digital
Codec ID                    : 2000
Duration                    : 6 s 912 ms
Bit rate mode               : Constant
Bit rate                    : 448 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)
Bit depth                   : 16 bits
Compression mode            : Lossy
Stream size                 : 378 KiB (18%)
Alignment                   : Aligned on interleaves
Interleave, duration        : 32  ms (0.80 video frame)
Service kind                : Complete Main

At a direct glance, the Codec ID of the audio stream seems to be different.
Is that causing the trouble? Or is it something else?

Thanks
Nithin