[MEncoder-users] Mencoder segmentation fault

[Grozdan Nikolov]

On Monday 16 July 2007 22:10, Sofija Blazevski wrote:
> Grozdan Nikolov wrote:
> >
> > Is this a WMV9 file? if so, AFAIK, WMV9 supports b-frames (I might be
> > wrong though) so if the input file has any b-frames in it, the lavf muxer
> > will segfaul... Make sure that you don't feed this muxer with any files
> > that have b-frames in them
> >
> > Maybe first re-encode the input file to Xvid or Divx *without* b-frames
> > and then use the resulting file with the lavf muxer to convert it to FLV
>
> No this is WMV8 file - I had to add additional codec for it (it isn't
> with in binary codec package available from
> http://www.mplayerhq.hu/design7/dload.html )
> And it is not just with .wmv same is for .mov and I think for .avi but
> I'd have to check. For sure it goes ok with .mpg

hmmm this is strange, I have no problems converting files without b-frames 
into FLV format using the lavf muxer

>
> Just for info, can I check if there is B frame in a movie using
> mencoder? Or some other program? I ask because I'd like to see if check
> it through php at the end by using exec for example.

you can visualize b-frames with:

mplayer -lavdopts vismv=2 path_to_file.wmv

not sure if it's very useful

>
> Here is output of .mov
>
> [OUTPUT START]
>  mencoder video/14.mov -o flvideo/14.flv -of lavf -oac mp3lame -lameopts
> abr:br=56 -ovc lavc -lavcopts
> vcodec=flv:vbitrate=800:mbd=2:mv0:trell:v4mv:keyint=10:cbp:last_pred=3
> -lavfopts i_certify_that_my_video_stream_does_not_use_b_frames -srate 22050

add just before the -lavfopts option... 

format=flv:i_certify_that_my_video_stream_does_not_use_b_frame


> MEncoder 1.0rc1-3.4.6 (C) 2000-2006 MPlayer Team
> CPU: Dual-Core AMD Opteron(tm) Processor 1212 (Family: 15, Model: 67,
> Stepping: 3)
> CPUflags: Type: 15 MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 1
> Compiled with runtime CPU detection.
> success: format: 0  data: 0x0 - 0x116358
> Quicktime/MOV file format detected.
> VIDEO:  [mp4v]  320x240  24bpp  15.000 fps    0.0 kbps ( 0.0 kbyte/s)
> [V] filefmt:7  fourcc:0x7634706D  size:320x240  fps:15.00  ftime:=0.0667
> ==========================================================================
> Opening audio decoder: [faad] AAC (MPEG2/4 Advanced Audio Coding)
> AUDIO: 32000 Hz, 2 ch, s16le, 64.0 kbit/6.25% (ratio: 8000->128000)
> Selected audio codec: [faad] afm: faad (FAAD AAC (MPEG-2/MPEG-4 Audio)
> decoder)
> ==========================================================================
> ** MUXER_LAVF
> *****************************************************************
> You have certified that your video stream does not contain B frames.
> REMEMBER: MEncoder's libavformat muxing is presently broken and will
> generate
> INCORRECT files in the presence of B frames. Moreover, due to bugs MPlayer
> will play these INCORRECT files as if nothing were wrong!
> ***************************************************************************
>**** OK, exit
> Opening video filter: [expand osd=1]
> Expand: -1 x -1, -1 ; -1, osd: 1, aspect: 0.000000, round: 1
> ==========================================================================
> Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
> Selected video codec: [ffodivx] vfm: ffmpeg (FFmpeg MPEG-4)
> ==========================================================================
> MP3 audio selected.
> Segmentation fault
> [OUTPUT END]
>
> Might it be something with audio - "Segmentation fault" appeared just
> after  "MP3 audio selected."?
>
> >> [OUTPUT START]
> >> mencoder video/15.wmv -o flvideo/15.flv -of lavf -oac mp3lame -lameopts
> >> abr:br=56 -ovc lavc -lavcopts
> >> vcodec=flv:vbitrate=800:mbd=2:mv0:trell:v4mv:keyint=10:cbp:last_pred=3
> >> -lavfopts i_certify_that_my_video_stream_does_not_use_b_frames -srate
> >> 22050 MEncoder 1.0rc1-3.4.6 (C) 2000-2006 MPlayer Team
> >> CPU: Dual-Core AMD Opteron(tm) Processor 1212 (Family: 15, Model: 67,
> >> Stepping: 3)
> >> CPUflags: Type: 15 MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 1
> >> Compiled with runtime CPU detection.
> >> success: format: 0  data: 0x0 - 0x75880
> >> ASF file format detected.
> >> VIDEO:  [WMV2]  320x240  24bpp  1000.000 fps    0.0 kbps ( 0.0 kbyte/s)
> >> [V] filefmt:6  fourcc:0x32564D57  size:320x240  fps:1000.00 
> >> ftime:=0.0010
> >> ========================================================================
> >>== Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
> >> AUDIO: 32000 Hz, 2 ch, s16le, 40.0 kbit/3.91% (ratio: 5000->128000)
> >> Selected audio codec: [ffwmav2] afm: ffmpeg (DivX audio v2 (FFmpeg))
> >> ========================================================================
> >>== ** MUXER_LAVF
> >> *****************************************************************
> >> You have certified that your video stream does not contain B frames.
> >> REMEMBER: MEncoder's libavformat muxing is presently broken and will
> >> generate
> >> INCORRECT files in the presence of B frames. Moreover, due to bugs
> >> MPlayer will play these INCORRECT files as if nothing were wrong!
> >> ************************************************************************
> >>*** **** OK, exit
> >> Opening video filter: [expand osd=1]
> >> Expand: -1 x -1, -1 ; -1, osd: 1, aspect: 0.000000, round: 1
> >> ========================================================================
> >>== Opening video decoder: [dshow] DirectShow video codecs
> >> Decoder supports the following YUV formats: YUY2 IYUV UYVY YV12 YVYU
> >> I420 YVU9
> >> Decoder is capable of YUV output (flags 0x7f)
> >> VDec: vo config request - 320 x 240 (preferred colorspace: Packed YUY2)
> >> [PP] Using codec's postprocessing, max q = 4.
> >> VDec: using Planar YV12 as output csp (no 0)
> >> Movie-Aspect is undefined - no prescaling applied.
> >> videocodec: libavcodec (320x240 fourcc=766c66 [flv])
> >> [VE_LAVC] High quality encoding selected (non-realtime)!
> >> Selected video codec: [wmv8] vfm: dshow (Windows Media Video 8)
> >> ========================================================================
> >>== MP3 audio selected.
> >> Segmentation fault
> >> [OUTPUT END
> >> ]
> >>
> >> Grozdan Nikolov wrote:
> >>> On Monday 16 July 2007 13:37, Sofija Blazevski wrote:
> >>>> [OUTPUT START]
> >>>> mencoder video/9.wmv -o flvideo/9.flv -of lavf -oac mp3lame -lameopts
> >>>> abr=br56 -ovc lavc -lavcopts
> >>>> vcodec=flv:vbitrate=800:mbd=2:mv0:trell:v4mv:keyint=10:cbp:last_pred=3
> >>>> -lavfopts i_certify_that_my_video_stream_does_not_use_b_frames -srate
> >>>> 22050
> >>>
> >>> it should be -oac mp3lame -lameopts abr:br=56
> >>>
> >>> you have abr=br56 which is wrong
> >>>
> >>>> _______________________________________________
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> >>>> MEncoder-users at mplayerhq.hu
> >>>> http://lists.mplayerhq.hu/mailman/listinfo/mencoder-users