[MPlayer-users] Looking for pointers: conversion of DTivo .ty files to mpeg4
Mark Mason
purplemark at mac.com
Sun May 9 02:11:13 CEST 2004
Email try #2, the first didn't seem to go through...
Thx,
Mark
Begin forwarded message:
> From: Mark Mason <purplemark at mac.com>
> Date: May 8, 2004 12:44:56 PM PDT
> To: bugreports MPlayer usage questions features
> <mplayer-users at mplayerhq.hu>
> Cc: Mark Mason <purplemark at mac.com>
> Subject: Looking for pointers: conversion of DTivo .ty files to mpeg4
>
> 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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