[MEncoder-users] Bug: floating point exception when converting to DV

[Levente Novák]

Corey Hickey wrote:

> Levente Novák wrote:
> > What is strange that the same SIGFPE reappears. I think no SIGFPE should
> > occur normally, it should print an error message instead.
> 
> The relevant function in lavf returns an error value, but there is
> (currently) no way in mencoder to pass that error back from the muxer,
> through the encoder, and up the filter chain.
> 
> I don't know if I'll address this; I seem to remember a thread about
> muxer return values a long time ago, but I can't find it and I may be
> mistaken.
> 
> > Also, I don't really understand why the conversion of this FFVHuff AVI does 
> > not work: the video size is OK and audio is also converted to 2 ch, 
> > 48000 Hz s16le PCM. Do you see something I missed in my command line?
> 
> I don't see anything that should be wrong; please upload the file (or
> enough of it to test).
> 

I've cut out a small excerpt from the FFVHuff encoded file and uploaded
it to ftp://upload.mplayerhq.hu/MPlayer/incoming/ as ffvhuff-422p_small.avi
and the same brief description than here as ffvhuff-422p_small.txt.

Here is the command line and the error log:

mencoder-test2 ffvhuff-422p_small.avi -vf
il=d:d,scale,format=yv12,il=i:i -af resample=48000:channels=2 -fps 25
-ofps 25 -of lavf -lavfopts
i_certify_that_my_video_stream_does_not_use_b_frames:format=dv -oac pcm
-ovc lavc -lavcopts vcodec=dvvideo -o ffvhuff-422p_small.dv
MEncoder dev-SVN-r23302-4.1.2 (C) 2000-2007 MPlayer Team
CPU: Intel(R) Celeron(R) CPU 3.06GHz (Family: 15, Model: 4, Stepping: 1)
CPUflags: Type: 15 MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1
Compiled for x86 CPU with extensions: MMX MMX2 SSE SSE2

success: format: 0  data: 0x0 - 0x500000
AVI file format detected.
[aviheader] Video stream found, -vid 0
[aviheader] Audio stream found, -aid 1
VIDEO:  [FFVH]  720x576  16bpp  25.000 fps  -62408.3 kbps (-7618.2
kbyte/s)
[V] filefmt:3  fourcc:0x48564646  size:720x576  fps:25.00  ftime:=0.0400
Input fps will be interpreted as 25.00 instead.
==========================================================================
Opening audio decoder: [pcm] Uncompressed PCM audio decoder
AUDIO: 44100 Hz, 1 ch, s16le, 705.6 kbit/100.00% (ratio: 88200->88200)
Selected audio codec: [pcm] afm: pcm (Uncompressed PCM)
==========================================================================
** 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 filter: [il=i:i]
Opening video filter: [format fmt=yv12]
Opening video filter: [scale]
Opening video filter: [il=d:d]
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffhuffyuv] vfm: ffmpeg (FFmpeg HuffYUV)
==========================================================================
VDec: vo config request - 720 x 576 (preferred colorspace: Planar 422P)
VDec: using Planar 422P as output csp (no 1)
Movie-Aspect is undefined - no prescaling applied.
SwScaler: reducing / aligning filtersize 1 -> 4
SwScaler: reducing / aligning filtersize 1 -> 4
SwScaler: reducing / aligning filtersize 1 -> 1
SwScaler: reducing / aligning filtersize 9 -> 8
[swscaler @ 0x889bc98]SwScaler: BICUBIC scaler, from yuv422p to yuv420p
using MMX2
[swscaler @ 0x889bc98]SwScaler: using 4-tap MMX scaler for horizontal
luminance scaling
[swscaler @ 0x889bc98]SwScaler: using 4-tap MMX scaler for horizontal
chrominance scaling
[swscaler @ 0x889bc98]SwScaler: using 1-tap MMX "scaler" for vertical
scaling (YV12 like)
[swscaler @ 0x889bc98]SwScaler: 720x576 -> 720x576
videocodec: libavcodec (720x576 fourcc=64737664 [dvsd])
New_Face failed. Maybe the font path is wrong.
Please supply the text font file (~/.mplayer/subfont.ttf).
subtitle font: load_sub_face failed.
VIDEO CODEC ID: 25
AUDIO CODEC ID: 10000, TAG: 0
Writing header...
[dv @ 0x8768e28]Can't initialize DV format!
Make sure that you supply exactly two streams:
     video: 25fps or 29.97fps, audio: 2ch/48Khz/PCM
     (50Mbps allows an optional second audio stream)
Floating point exception


Levente

PS: I am sending this mail directly from the link at the ML archive
as our mail server does not work ATM. Sorry if it does not appear in 
its proper thread.