[MEncoder-users] Problems with A/V sync when making mp4

[Grozdan]

On Saturday 10 January 2009 03:15:36 Alex Samad wrote:
> Hi
>
> I seem to be having some problem keeping the a/v in sync when mencoding
>
> mplayer -identify -frames 0 WhyCopyright.iso
>
> MPlayer dev-SVN-r26940
> CPU: AMD Phenom(tm) 9750 Quad-Core Processor (Family: 16, Model: 2,
> Stepping: 3)
> CPUflags:  MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 1
> Compiled with runtime CPU detection.
>
> Playing WhyCopyright.iso.
> Cache fill:  0.00% (0 bytes)
> ID_VIDEO_ID=0
> MPEG-PS file format detected.
> ID_SUBTITLE_ID=0
> ID_AUDIO_ID=160
> VIDEO:  MPEG2  720x480  (aspect 2)  29.970 fps  9800.0 kbps (1225.0
> kbyte/s)
> ID_FILENAME=WhyCopyright.iso
> ID_DEMUXER=mpegps
> ID_VIDEO_FORMAT=0x10000002
> ID_VIDEO_BITRATE=9800000
> ID_VIDEO_WIDTH=720
> ID_VIDEO_HEIGHT=480
> ID_VIDEO_FPS=29.970
> ID_VIDEO_ASPECT=0.0000
> ID_AUDIO_FORMAT=65537
> ID_AUDIO_BITRATE=0
> ID_AUDIO_RATE=0
> ID_AUDIO_NCH=0
> ID_LENGTH=2556.06
> ID_SEEKABLE=1
> vo: couldn't open the X11 display ()!
> Error opening/initializing the selected video_out (-vo) device.
> ==========================================================================
> Opening audio decoder: [dvdpcm] Uncompressed DVD/VOB LPCM audio decoder
> AUDIO: 48000 Hz, 2 ch, s16be, 1536.0 kbit/100.00% (ratio:
> 192000->192000)
> ID_AUDIO_BITRATE=1536000
> ID_AUDIO_RATE=48000
> ID_AUDIO_NCH=2
> Selected audio codec: [dvdpcm] afm: dvdpcm (Uncompressed DVD/VOB LPCM)
> ==========================================================================
> [AO_ALSA] Format floatle is not supported by hardware, trying default.
> AO: [alsa] 48000Hz 2ch s16le (2 bytes per sample)
> ID_AUDIO_CODEC=dvdpcm
> Video: no video
> Starting playback...
>
>
> Exiting... (End of file)
>
>
>
> These are the command I run
>
> echo Video Pass 1/2
> nice mencoder -really-quiet -vf hqdn3d=2:1:2,pp=de,uspp=5,harddup
> -af volnorm=1  -ovc x264  -x264encopts
> pass=1:turbo=2:nob_pyramid:bframes=1:subq=6:frameref=3:partitions=all:me=um
>h:weight_b:threads=auto:qcomp=0.75:mixed_refs:nofast_pskip:trellis=2:nodct_d
>ecimate:nopsnr:brdo:bitrate=2000 -oac faac  -faacopts
> br=128:object=2:tns:mpeg=4  -passlogfile
> "/tmp/user/1000/myConvert.dG81M/divx2pass.log" -o /dev/null
> "WhyCopyright.iso" -idx    >>"/tmp/user/1000/myConvert.dG81M/stdout.txt"
> 2>>"/tmp/user/1000/myConvert.dG81M/stderr.txt"
>
>
> echo Video Pass 2/2
> nice mencoder -really-quiet      -vf hqdn3d=2:1:2,pp=de,uspp=5,harddup
> -af volnorm=1  -ovc x264  -x264encopts
> pass=2:nob_pyramid:bframes=1:subq=6:frameref=3:partitions=all:me=umh:weight
>_b:threads=auto:qcomp=0.75:mixed_refs:nofast_pskip:trellis=2:nodct_decimate:
>nopsnr:brdo:bitrate=2000 -oac faac  -faacopts br=128:object=2:tns:mpeg=4 
> -passlogfile
> "/tmp/user/1000/myConvert.dG81M/divx2pass.log" -o
> "/tmp/user/1000/myConvert.dG81M/WhyCopyright.iso.avi" "WhyCopyright.iso"
> -idx    >>"/tmp/user/1000/myConvert.dG81M/stdout.txt"
> 2>>"/tmp/user/1000/myConvert.dG81M/stderr.txt"
>
> nice MP4Box -aviraw video
> "/tmp/user/1000/myConvert.dG81M/WhyCopyright.iso.avi" -out
> "/tmp/user/1000/myConvert.dG81M/WhyCopyright.iso.h264"
>
> >>"/tmp/user/1000/myConvert.dG81M/stdout.txt"
> >>2>>"/tmp/user/1000/myConvert.dG81M/stderr.txt"
>
> nice MP4Box -aviraw audio
> "/tmp/user/1000/myConvert.dG81M/WhyCopyright.iso.avi" -out
> "/tmp/user/1000/myConvert.dG81M/WhyCopyright.iso.aac"
>
> >>"/tmp/user/1000/myConvert.dG81M/stdout.txt"
> >>2>>"/tmp/user/1000/myConvert.dG81M/stderr.txt"
>
> nice  mv "/tmp/user/1000/myConvert.dG81M/WhyCopyright.iso_audio.raw"
> "/tmp/user/1000/myConvert.dG81M/WhyCopyright.iso_audio.aac"
>
> >>"/tmp/user/1000/myConvert.dG81M/stdout.txt"
> >>2>>"/tmp/user/1000/myConvert.dG81M/stderr.txt"
>
> nice MP4Box -add
> "/tmp/user/1000/myConvert.dG81M/WhyCopyright.iso_video.h264" -add
> "/tmp/user/1000/myConvert.dG81M/WhyCopyright.iso_audio.aac" -new
> "/exports/video/Movies/UNCLASSIFIED/Why
> Copyright.avivies/UNCLASSIFIED/Why Copyright.mp4"
>
> >>"/tmp/user/1000/myConvert.dG81M/stdout.txt"
> >>2>>"/tmp/user/1000/myConvert.dG81M/stderr.txt"
>
> nice touch -r "WhyCopyright.iso" "/exports/video/Movies/UNCLASSIFIED/Why
> Copyright.avivies/UNCLASSIFIED/Why Copyright.mp4"
>
> >>"/tmp/user/1000/myConvert.dG81M/stdout.txt"
> >>2>>"/tmp/user/1000/myConvert.dG81M/stderr.txt"
>
> Finished output in [/exports/video/Movies/UNCLASSIFIED/Why
> Copyright.avivies/UNCLASSIFIED/Why Copyright.mp4]
>
>
> Any ideas why I am out of sync or what I can do to fix it ?

is the original AVI out of sync or your MP4 file? in the case of the MP4 file, 
you need to pass the FPS value to MP4Box as it uses by default 25 fps while 
your AVI is 29.970. So just add -fps 29.970 to MP4Box' parameters when 
muxing.



-- 
Regards

http://h264enc.sourceforge.net