[MEncoder-users] asf 2 asf (wmv)?

[mesecam]

2006/3/22, SZABO Zsolt <szazs at mm.bme.hu>:
> I dumpstreamed a wmv from the net:
>
> $ file 20060313.wmv
> 20060313.wmv: Microsoft ASF
>
> $ mplayer 20060313.wmv
> MPlayer dev-CVS-060307-23:29-3.3.5 (C) 2000-2006 MPlayer Team
> CPU: Intel Pentium M Dothan (Family: 6, Stepping: 6)
> CPUflags:  MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1
> Compiled for x86 CPU with extensions: MMX MMX2 SSE SSE2
>
> Playing 20060313.wmv.
> ASF file format detected.
> VIDEO:  [WMV3]  320x240  24bpp  1000.000 fps    0.0 kbps ( 0.0 kbyte/s)
> Clip info:
> [...]
> ==========================================================================
> Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
> AUDIO: 44100 Hz, 1 ch, s16le, 48.0 kbit/6.81% (ratio: 6003->88200)
> Selected audio codec: [ffwmav2] afm: ffmpeg (DivX audio v2 (FFmpeg))
> ==========================================================================
> Opening video decoder: [dmo] DMO video codecs
> DMO dll supports VO Optimizations 0 1
> DMO dll might use previous sample when requested
> GetOutput r=0x0   size:230400  align:1
> StreamCount r=0x0  1  1
> Decoder supports the following formats: YV12 YUY2 UYVY YVYU RGB8 RGB555
> RGB565 RGB24 RGB32
> Decoder is capable of YUV output (flags 0x1b)
> VDec: vo config request - 320 x 240 (preferred colorspace: Packed YUY2)
> VDec: using Planar YV12 as output csp (no 0)
> Movie-Aspect is undefined - no prescaling applied.
> VO: [xv] 320x240 => 320x240 Planar YV12
> Selected video codec: [wmv9dmo] vfm: dmo (Windows Media Video 9 DMO)
> ==========================================================================
>
> And then I clipped its first 10 minutes:
>
> $ mencoder 20060313.wmv -oac copy -ovc copy -endpos 600 -o new.wmv
> [...]
>
> $ file new.wmv
> new.wmv: RIFF (little-endian) data, AVI, 320 x 240, >30 fps, video:,
> audio: DivX (mono, 44100 Hz)
>
> $ mplayer new.wmv
> MPlayer dev-CVS-060307-23:29-3.3.5 (C) 2000-2006 MPlayer Team
> CPU: Intel Pentium M Dothan (Family: 6, Stepping: 6)
> CPUflags:  MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1
> Compiled for x86 CPU with extensions: MMX MMX2 SSE SSE2
>
> Playing new.wmv.
> AVI file format detected.
> VIDEO:  [WMV3]  320x240  24bpp  1000.000 fps  283.7 kbps (34.6 kbyte/s)
> Clip info:
>   Software: MEncoder dev-CVS-060307-23:29-3.3.5
> ==========================================================================
> Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
> AUDIO: 44100 Hz, 1 ch, s16le, 48.0 kbit/6.81% (ratio: 6003->88200)
> Selected audio codec: [ffwmav2] afm: ffmpeg (DivX audio v2 (FFmpeg))
> ==========================================================================
> Opening video decoder: [dmo] DMO video codecs
> DMO dll supports VO Optimizations 0 1
> DMO dll might use previous sample when requested
> GetOutput r=0x0   size:230400  align:1
> StreamCount r=0x0  1  1
> Decoder supports the following formats: YV12 YUY2 UYVY YVYU RGB8 RGB555
> RGB565 RGB24 RGB32
> Decoder is capable of YUV output (flags 0x1b)
> VDec: vo config request - 320 x 240 (preferred colorspace: Packed YUY2)
> VDec: using Planar YV12 as output csp (no 0)
> Movie-Aspect is undefined - no prescaling applied.
> VO: [xv] 320x240 => 320x240 Planar YV12
> Selected video codec: [wmv9dmo] vfm: dmo (Windows Media Video 9 DMO)
> ==========================================================================
>
> And it's nice, however, windows mediaplayer does not recognize its
> format...
>
> I have also tried to reencode it in avi container with mpeg4, but its
> quality is much poorer than that of the original wmv file. (There was a
> huge amount of duplicate frames during the encoding, and small blocks are
> noticeable...)
>
> Any hint how to solve this problem?
>
> Zs
>
> _______________________________________________
> MEncoder-users mailing list
> MEncoder-users at mplayerhq.hu
> http://mplayerhq.hu/mailman/listinfo/mencoder-users
>


In the Mplayer/Mencoder documentation:
---------------------------------------------------------------------------------------------------------------
Q:I can't encode an ASF file to AVI/MPEG-4 (DivX) because it uses 1000 fps.

A:Since ASF uses variable framerate but AVI uses a fixed one, you have
to set it by hand with the -ofps option.

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If you want to keep a WMV container, you should try the FFmpeg
libavformat muxers options

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The manpage you shall read