Mediacoder converting MKV to AVI with MP3 no sound


#1

I have been using Mediacoder for several years with good results but recently I am having problems with MKV file conversions to AVI format. Sometimes the audio is out of sync and I have to adjust delay to correct it. Other times there is no audio when playing the converted video.

Here are the specs for the incoming MKV file:

General
Unique ID : 0 (0x0)
Complete name : V:\F Drive Videos\Temporary Work\Test.mkv
Format : Matroska
Format version : Version 4 / Version 2
File size : 799 MiB
Duration : 50 min 51 s
Overall bit rate : 2 198 kb/s
Encoded date : UTC 2010-02-22 21:41:29
Writing application : no_variable_data
Writing library : no_variable_data

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.1
Format settings, CABAC : Yes
Format settings, RefFrames : 5 frames
Codec ID : V_MPEG4/ISO/AVC
Duration : 50 min 51 s
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 25.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Writing library : x264 core 150 r2833 df79067
Encoding settings : cabac=1 / ref=5 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=8 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=12 / lookahead_threads=2 / 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=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=50 / rc=crf / mbtree=1 / crf=18.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
Language : English
Default : Yes
Forced : No
Color range : Limited
Matrix coefficients : BT.709

Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : A_AAC
Duration : 50 min 51 s
Channel(s) : 6 channels
Channel positions : Front: L C R, Side: L R, LFE
Sampling rate : 48.0 kHz
Frame rate : 46.875 FPS (1024 SPF)
Compression mode : Lossy
Default : Yes
Forced : No

Here are the specs from the converted AVI file:

General
Complete name : M:\Converted to AVI\MediaCoder\Test.avi
Format : AVI
Format/Info : Audio Video Interleave
File size : 742 MiB
Duration : 2 h 32 min
Overall bit rate : 680 kb/s
Writing application : Lavf55.33.100

Video
ID : 0
Format : MPEG-4 Visual
Format profile : Simple@L3
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 : 50 min 51 s
Bit rate : 1 914 kb/s
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
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) : 0.083
Stream size : 696 MiB (94%)
Writing library : XviD 67

Audio
ID : 1
Format : MPEG Audio
Format version : Version 1
Format profile : Layer 3
Mode : Joint stereo
Mode extension : MS Stereo
Codec ID : 55
Codec ID/Hint : MP3
Duration : 2 h 32 min
Bit rate mode : Constant
Bit rate : 32.0 kb/s
Channel(s) : 2 channels
Sampling rate : 48.0 kHz
Compression mode : Lossy
Stream size : 34.9 MiB (5%)
Alignment : Aligned on interleaves
Interleave, duration : 8 ms (0.20 video frame)
Interleave, preload duratio : 24 ms
Writing library : LAME3.99.5

Any suggestions as to why this is happening sometimes but not all the time?

Thanks in advance for any suggestions.


#2

There is nothing obviously wrong. You might compare one file that gave problems to one that didn’t and see if you can spot differences in the way they are encoded.