#895 ffmpeg created dv50 files report incorrect bitrate in mediainfo

[Brandon Foltz]

mediainfo seems to incorrectly identify the bitrate on ffmpeg generated dv50 files. They are reported as being 28.8mbps regardless of what settings I apply to ffmpeg (though the dv50 file is indeed double the size of the dv25 file I create, and ffmpeg log shows they are encoded @ 57.5mbps). Here's some sample output:

DV file created with this ffmpeg (v. 2.4.2) string:
ffmpeg -i myinputfile.mov -target ntsc-dv50 testout-dv50.dv

And here's the mediainfo (v0.7.64) output:
video04:~ video_4$ mediainfo /Volumes/GBAUDIO/Video/Projects/2011344\ GBA/Work/FFMPEG_experiments/output/testout-dv50.dv General
Complete name : /Volumes/GBAUDIO/Video/Projects/2011344 GBA/Work/FFMPEG_experiments/output/testout-dv50.dv
Format : DV
Commercial name : DVCPRO
File size : 280 MiB
Duration : 1mn 21s
Overall bit rate mode : Constant
Overall bit rate : 28.8 Mbps
Recorded date : 1970-01-01 00:00:00.000

Video
Format : DV
Commercial name : DVCPRO
Duration : 1mn 21s
Bit rate mode : Constant
Bit rate : 24.4 Mbps
Width : 720 pixels
Height : 480 pixels
Display aspect ratio : 4:3
Frame rate mode : Constant
Frame rate : 29.970 fps
Standard : NTSC
Bit depth : 8 bits
Scan type : Interlaced
Scan order : Bottom Field First
Compression mode : Lossy
Bits/(Pixel*Frame) : 2.357
Time code of first frame : 00:00:00;00
Time code source : Subcode time code
Stream size : 238 MiB (85%)

Audio #1
ID : 0
Format : PCM
Duration : 1mn 21s
Bit rate mode : Constant
Bit rate : 1 536 Kbps
Encoded bit rate : 0 bps
Channel count : 2 channels
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Stream size : 14.9 MiB (5%)

Audio #2
ID : 1
Format : PCM
Duration : 1mn 21s
Bit rate mode : Constant
Bit rate : 1 536 Kbps
Encoded bit rate : 0 bps
Channel count : 2 channels
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Stream size : 14.9 MiB (5%)