[MPlayer-users] Looking for pointers: conversion of DTivo .ty files to mpeg4
Mark Mason
purplemark at mac.com
Sat May 8 21:44:56 CEST 2004
Hello all,
I'm attempting to convert some Tivo .ty files to DiVx (mpeg4), and am
running into a couple of problems. Any help with command line args, or
pointers on how to go about debugging these problems would be greatly
appreciated. I'm interested in getting into the code, but am pretty
much a rank beginner on digital video code at this point.
These .ty files were extracted with tyStudio from a DTivo (Series 1).
I've given up on using tyStudio for the .ty -> .mpg conversion, as the
audio always seems to end up a lot choppier than just using
mplayer/mencoder on the .ty stream directly.
I'm running the latest mplayer and mencoder (CVS as of last night). My
host is MacOS X (dual G5).
I'm building with --enable-debug. The problems I'm having are present
in both debug and non-debug builds.
If there's different or additional information I should be providing,
please let me know.
General question: can anyone recommend a good starting point for video
filters/options for this type of conversion? I'm particularly
interested in any advice on the right way to handle the apparently
frequent frame-rate changes (29.970 fps -> 23.976 fps and back again).
I've read the telecine/interlace/progressive part of the manual, but
that advice seems aimed more at DVD video which (apparently) has fewer
back and forth switches.
First issue: Attempting a 3-pass encoding, mencoder core dumps on the
26th frame. I'm assuming this is a bug, but I may have also done
something wrong with the command line args. I've not really gotten far
enough into the code to debug this, but it looks like there's an
assumption that a vfilter should be present (and it's missing).
+ rm -f frameno.avi
+ /Users/markmason/sourceforge/mplayer/main/mencoder -v 'Dateline
NBC-Behind_ The Apprentice.ty' -ovc frameno -oac mp3lame -lameopts
cbr:br=128 -o frameno.avi
TiVo file format detected.
Searching for sequence header... OK!
VIDEO: MPEG2 480x480 (aspect 2) 29.970 fps 15000.0 kbps (1875.0
kbyte/s)
[V] filefmt:33 fourcc:0x10000002 size:480x480 fps:29.97
ftime:=0.0334
========================================================================
==
Opening audio decoder: [mp3lib] MPEG layer-2, layer-3
dec_audio: Allocating 4608 + 65536 = 70144 bytes for output buffer.
mp3lib: using generic C decore!
MP3lib: init layer2&3 finished, tables done
MPEG 1.0, Layer II, 48000 Hz 160 kbit Joint-Stereo, BPF: 480
Channels: 2, copyright: Yes, original: Yes, CRC: No, emphasis: 0
AUDIO: 48000 Hz, 2 ch, 16 bit (0x20), ratio: 20000->192000 (160.0 kbit)
Selected audio codec: [mp3] afm:mp3lib (mp3lib MPEG layer-2, layer-3)
========================================================================
==
MP3 audio selected
Building audio filter chain for 48000Hz/2ch/16bit ->
48000Hz/2ch/16bit...
[libaf] Adding filter dummy
[dummy] Was reinitialized, rate=48000Hz, nch = 2, format = 0x00000000
and bps = 2
[dummy] Was reinitialized, rate=48000Hz, nch = 2, format = 0x00000000
and bps = 2
Writing AVI header...
ODML: Aspect information not (yet?) available or unspecified, not
writing vprp header.
LAME version 3.97 (alpha 1, May 8 2004 01:41:42)
(http://www.mp3dev.org/)
warning: alpha versions should be used for testing only
Using polyphase lowpass filter, transition band: 17226 Hz - 17806 Hz
[snip]
Pos: 0.9s 26f ( 0%) 0fps Trem: 0min 0mb A-V:-0.013 [0:127]
A/Vms 2/0 D/B/S 0/0/0
Program received signal EXC_BAD_ACCESS, Could not access memory.
0x00005488 in main (argc=384, argv=0x1) at mencoder.c:1323
1323 if (!encode_duplicates || ((vf_instance_t
*)sh_video->vfilter)->control(sh_video->vfilter,
VFCTRL_DUPLICATE_FRAME, 0) != CONTROL_TRUE)
(gdb) p sh_video
$1 = (sh_video_t *) 0x1908f50
(gdb) p sh_video->vfilter
$2 = (void *) 0x0
(gdb) l
1318 if(skip_flag<0){
1319 // duplicate frame
1320 if(file_format != DEMUXER_TYPE_TV && !verbose)
printf(MSGTR_DuplicateFrames,-skip_flag);
1321 while(skip_flag<0){
1322 duplicatedframes++;
1323 if (!encode_duplicates || ((vf_instance_t
*)sh_video->vfilter)->control(sh_video->vfilter,
VFCTRL_DUPLICATE_FRAME, 0) != CONTROL_TRUE)
1324 muxer_write_chunk(mux_v,0,0);
1325 ++skip_flag;
1326 }
1327 } else
Second issue: when trying a two-pass encoding (having given up on
3-pass),
+ rm -f frameno.avi
+ /Users/markmason/sourceforge/mplayer/main/mencoder -v 'Dateline
NBC-Behind_ The Apprentice.ty' -vf scale=640:480,crop=638:476:2:2 -ovc
lavc -lavcopts vcodec=mpeg4:vhq:v4mv:trell:vpass=1 -oac mp3lame
-lameopts cbr:br=128 -o /dev/null
TiVo file format detected.
Searching for sequence header... OK!
VIDEO: MPEG2 480x480 (aspect 2) 29.970 fps 15000.0 kbps (1875.0
kbyte/s)
[V] filefmt:33 fourcc:0x10000002 size:480x480 fps:29.97
ftime:=0.0334
========================================================================
==
Opening audio decoder: [mp3lib] MPEG layer-2, layer-3
dec_audio: Allocating 4608 + 65536 = 70144 bytes for output buffer.
mp3lib: using generic C decore!
MP3lib: init layer2&3 finished, tables done
MPEG 1.0, Layer II, 48000 Hz 160 kbit Joint-Stereo, BPF: 480
Channels: 2, copyright: Yes, original: Yes, CRC: No, emphasis: 0
AUDIO: 48000 Hz, 2 ch, 16 bit (0x20), ratio: 20000->192000 (160.0 kbit)
Selected audio codec: [mp3] afm:mp3lib (mp3lib MPEG layer-2, layer-3)
========================================================================
==
Opening video filter: [expand osd=1]
Expand: -1 x -1, -1 ; -1 (-1=autodetect) osd: 1
Opening video filter: [crop w=638 h=476 x=2 y=2]
Crop: 638 x 476, 2 ; 2
Opening video filter: [scale w=640 h=480]
SwScale params: 640 x 480 (-1=no scaling)
========================================================================
==
Opening video decoder: [mpegpes] MPEG 1/2 Video passthrough
VDec: vo config request - 480 x 480 (preferred csp: Mpeg PES)
Trying filter chain: scale crop expand lavc
The selected video_out device is incompatible with this codec.
VDecoder init failed :(
Opening video decoder: [libmpeg2] MPEG 1/2 Video decoder libmpeg2-v0.3.1
Selected video codec: [mpeg12] vfm:libmpeg2 (MPEG 1 or 2 (libmpeg2))
========================================================================
==
MP3 audio selected
Building audio filter chain for 48000Hz/2ch/16bit ->
48000Hz/2ch/16bit...
[libaf] Adding filter dummy
[dummy] Was reinitialized, rate=48000Hz, nch = 2, format = 0x00000000
and bps = 2
[dummy] Was reinitialized, rate=48000Hz, nch = 2, format = 0x00000000
and bps = 2
Writing AVI header...
ODML: Aspect information not (yet?) available or unspecified, not
writing vprp header.
LAME version 3.97 (alpha 1, May 8 2004 01:41:42)
(http://www.mp3dev.org/)
warning: alpha versions should be used for testing only
Using polyphase lowpass filter, transition band: 17226 Hz - 17806 Hz
[snip]
Pos:3553.1s 104637f (98%) 24fps Trem: 0min 394mb A-V:0.010
[785:128] A/Vms 2/37 D/B/S 2091/242/241
demux_mpg: 30fps NTSC content detected, switching framerate.
Warning! FPS changed 23.976 -> 29.970 (-5.994000) [4] :0.014
[785:128] A/Vms 2/37 D/B/S 2092/242/241
ty:WARNING - Would have blown my audio buffer 393mb A-V:0.059
[784:128] A/Vms 2/36 D/B/S 2092/248/247
Pos:3577.6s 105381f (99%) 25fps Trem: 0min 394mb A-V:0.031
[784:128] A/Vms 2/36 D/B/S 2095/256/250
Program received signal EXC_BAD_ACCESS, Could not access memory.
0x0022fa08 in mpeg2_set_buf (mpeg2dec=0x2006c10, buf=0x190aa00,
id=0x190a9e0) at decode.c:383
383 if (mpeg2dec->custom_fbuf && !mpeg2dec->fbuf[1]->buf[0]){
(gdb) where
#0 0x0022fa08 in mpeg2_set_buf (mpeg2dec=0x2006c10, buf=0x190aa00,
id=0x190a9e0) at decode.c:383
#1 0x0022f9a0 in mpeg2_set_buf (mpeg2dec=0x2006c10, buf=0x190aa00,
id=0x190a9e0) at decode.c:368
#2 0x0018bcfc in decode (sh=0x1909300, data=0x190aa00, len=33582096,
flags=480) at vd_libmpeg2.c:147
#3 0x00043364 in decode_video (sh_video=0x1909300, start=0x190aa00
"\002\200\200", in_size=33582620, drop_frame=0) at dec_video.c:309
#4 0x0000534c in main (argc=26257888, argv=0x2006e1c) at
mencoder.c:1297
(gdb) l
378 fbuf->buf[0] = buf[0];
379 fbuf->buf[1] = buf[1];
380 fbuf->buf[2] = buf[2];
381 fbuf->id = id;
382 // HACK! FIXME! At first I frame, copy pointers to
prediction frame too!
383 if (mpeg2dec->custom_fbuf && !mpeg2dec->fbuf[1]->buf[0]){
384 mpeg2dec->fbuf[1]->buf[0]=buf[0];
385 mpeg2dec->fbuf[1]->buf[1]=buf[1];
386 mpeg2dec->fbuf[1]->buf[2]=buf[2];
387 mpeg2dec->fbuf[1]->id=NULL;
(gdb) p mpeg2dec
$1 = (mpeg2dec_t *) 0x2006c10
(gdb) p mpeg2dec->custom_fbuf
$2 = 1
(gdb) p mpeg2dec->fbuf[1]
$3 = (fbuf_t *) 0x0
Third issue: if I use '-endpos 30' to get a preview .avi file, and then
load it into virtualDub (on my PC), I get complaints about not being
able to load a decompressor for the audio format. Is this normal given
the options I used?
Thanks in advance,
Mark
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