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Old 12-03-2006, 02:04 PM   #1
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Question DVD 2 Theora on the fly

Guys, I'm trying to "pipe" a DVD to ffmpeg2theora using a named pipe, but it fails.

What am I doing wrong?

$ mkfifo pipe.fifo
$ ffmpeg2theora -o video.ogg pipe.fifo &
[1] 8048
$ mencoder dvd://2 -oac pcm -ovc copy -o pipe.fifo
MEncoder 2:0.99+1.0pre8-0ubuntu8 (C) 2000-2006 MPlayer Team
CPU: AMD Athlon(tm)  (Family: 6, Model: 8, Stepping: 1)
CPUflags: Type: 6 MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 0
Compiled with runtime CPU detection.

Reading disc structure, please wait...
There are 14 titles on this DVD.
There are 13 chapters in this DVD title.
There are 1 angles in this DVD title.
DVD successfully opened.
success: format: 0  data: 0x0 - 0xde088800
MPEG-PS file format detected.
VIDEO:  MPEG2  720x480  (aspect 2)  29.970 fps  7600.0 kbps (950.0 kbyte/s)
[V] filefmt:2  fourcc:0x10000002  size:720x480  fps:29.97  ftime:=0.0334
Opening audio decoder: [dvdpcm] Uncompressed DVD/VOB LPCM audio decoder
AUDIO: 48000 Hz, 2 ch, s16be, 1536.0 kbit/100.00% (ratio: 192000->192000)
Selected audio codec: [dvdpcm] afm: dvdpcm (Uncompressed DVD/VOB LPCM)
videocodec: framecopy (720x480 24bpp fourcc=10000002)
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not writing vprp header.

File pipe.fifo has unknown data format
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not writing vprp header.
pipe.fifo: Error writing file.0fps Trem:   0min   0mb  A-V:0.000 [0:0]

[1]+  Exit 1                  ffmpeg2theora -o video.ogg pipe.fifo
I tried creating a "mid-step" file and then encoding and it worked flawlessly. How can I make it with the named pipe instead of the file?
Old 12-03-2006, 04:36 PM   #2
David the H.
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My guess is that you need to start mencoder before ffmpeg2theora. ffmpeg probably needs to have a detectable video format in the pipe when it starts.


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