Re: [FFmpeg-trac] #8064(undetermined:new): doesn't see full VOB track

[FFmpeg]

#8064: doesn't see full VOB track
-+-
 Reporter:   |Owner:
  brianjmurrell  |
 Type:  defect   |   Status:  new
 Priority:  normal   |Component:
 |  undetermined
  Version:  unspecified  |   Resolution:
 Keywords:   |   Blocked By:
 Blocking:   |  Reproduced by developer:  0
Analyzed by developer:  0|
-+-

Comment (by brianjmurrell):

 Replying to [comment:9 mkver]:
 > 1. Who says that VLC not simply uses another file without ever telling
 you?

 Like what other file?  I think all of the evidence here is more than just
 suggesting that the track's real duration is ~57 minutes, not the ~54 (and
 a short transcode) that ffmpeg is reporting.

 > 2. This point has been asked to distinguish between a bug in the part
 that estimates a file's duration and the actual demuxer (it is possible
 for remuxing with ffmpeg to yield a file with a different length than the
 initial estimate).

 Yes, but the resulting file is also truncated.  To be honest, I couldn't
 really care any less what any tool says what the duration of the file is.
 What I care about is that ffmpeg is producing a truncated transcode.  The
 durations are just being used as indicators that ffmpeg is not reading or
 calculating (or whatever) the duration properly and the end result is a
 truncated transcode.

 So let's just forget about durations -- reported, calculated or otherwise.
 This bug is really about ffmpeg truncating a transcode when it is being
 given the only VOB file that exists for a track and yet if that track is
 given to ffmpeg via `mplayer -dumpstream` it transcodes it just fine.

 I don't suppose this is going to go any further though without my
 violating a copyright and uploading a copy of the DVD.

 I seem to have gotten `mplayer -dumpstream` to work so maybe that's the
 end result of this issue.  Unfortunately.

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Re: [FFmpeg-trac] #8064(undetermined:new): doesn't see full VOB track

[FFmpeg]

#8064: doesn't see full VOB track
-+-
 Reporter:   |Owner:
  brianjmurrell  |
 Type:  defect   |   Status:  new
 Priority:  normal   |Component:
 |  undetermined
  Version:  unspecified  |   Resolution:
 Keywords:   |   Blocked By:
 Blocking:   |  Reproduced by developer:  0
Analyzed by developer:  0|
-+-

Comment (by mkver):

 1. Who says that VLC not simply uses another file without ever telling
 you?
 2. This point has been asked to distinguish between a bug in the part that
 estimates a file's duration and the actual demuxer (it is possible for
 remuxing with ffmpeg to yield a file with a different length than the
 initial estimate).
 4. If we accept this premise. Given that I already thought that you won't
 be able to upload the file I wanted to be sure that it is indeed a bug in
 ffmpeg.
 6. Indeed it would be.

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Re: [FFmpeg-trac] #8064(undetermined:new): doesn't see full VOB track

[FFmpeg]

#8064: doesn't see full VOB track
-+-
 Reporter:   |Owner:
  brianjmurrell  |
 Type:  defect   |   Status:  new
 Priority:  normal   |Component:
 |  undetermined
  Version:  unspecified  |   Resolution:
 Keywords:   |   Blocked By:
 Blocking:   |  Reproduced by developer:  0
Analyzed by developer:  0|
-+-

Comment (by brianjmurrell):

 1. Given that ffmpeg's idea that it's only 54:29 results in a transcode
 that chops off the last 1.5 minutes, I think VLC is the accurate one here.
 2. Is moot if we concede that the track really is 57:01 isn't it?
 3. Again, given #1, isn't this moot?
 4. Isn't this also moot if we accept #1?
 5. Yeah, not an option due to copyright issues.
 6. This would be a pity, as it does seem to be a problem in ffpmeg.

 I did manage to use `mplayer -dumpstream -dumpfile fifo` along with
 `ffmpeg` to convert the track and that did yield a 57:01 resulting
 transcode.  But boy that is hacky.  Both mplayer and ffmpeg need to be
 backgrounded multiple times to get it to the point of transcoding and
 ffmpeg doesn't stop at the end of the fifo but needs to be SIGINTR'd.

 Even though `mplayer -dumpstream` does manage to get `ffmpeg` the full
 file, it's got to be just about the worst tool for it, not backgrounding
 properly and not being able to pipe to stdout, etc.  Isn't there a better
 tool to just extract a title properly from a DVD?  My distribution doesn't
 seem to have `dvd2concat`.

 That said, I do think that that one single VOB has the full 57 minutes in
 it.  `ffmpeg` is just unable to extract it all.

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Re: [FFmpeg-trac] #8064(undetermined:new): doesn't see full VOB track

[FFmpeg]

#8064: doesn't see full VOB track
-+-
 Reporter:   |Owner:
  brianjmurrell  |
 Type:  defect   |   Status:  new
 Priority:  normal   |Component:
 |  undetermined
  Version:  unspecified  |   Resolution:
 Keywords:   |   Blocked By:
 Blocking:   |  Reproduced by developer:  0
Analyzed by developer:  0|
-+-

Comment (by Cigaes):

 FFmpeg has a tool called `dvd2concat`, it will allow to access the full
 video stream but is quite incomplete beyond that.

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Re: [FFmpeg-trac] #8064(undetermined:new): doesn't see full VOB track

[FFmpeg]

#8064: doesn't see full VOB track
-+-
 Reporter:   |Owner:
  brianjmurrell  |
 Type:  defect   |   Status:  new
 Priority:  normal   |Component:
 |  undetermined
  Version:  unspecified  |   Resolution:
 Keywords:   |   Blocked By:
 Blocking:   |  Reproduced by developer:  0
Analyzed by developer:  0|
-+-

Comment (by mkver):

 Here are some options for how to proceed with this ticket:
 1. You put the vob file in a folder where VLC can't see the other files
 and see whether it still shows the 57:01 duration.
 2. You could remux the DVD with ffmpeg to see if the output duration is
 actually 54:29.
 3. You could watch the vob file using ffplay and compare this to VLC. When
 doing so, you should also measure the duration and look if there is
 something that VLC has that ffplay is missing.
 4. You use another tool (e.g. MediaInfo) to inspect the file.
 5. You upload the file (or even the whole DVD)
 [https://streams.videolan.org/upload/ here] (project FFmpeg, of course),
 so that it can be analyzed whether this is a bug in FFmpeg (notice that it
 could also be VLC that is wrong). This could be problematic because of
 copyright issues.
 6. We close this ticket due to lack of reproducibility on our part.
 (1.-4. are only to decide whether this is an issue at all. If it is an
 issue, the sample will be needed anyway.)

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Re: [FFmpeg-trac] #8064(undetermined:new): doesn't see full VOB track

[FFmpeg]

#8064: doesn't see full VOB track
-+-
 Reporter:   |Owner:
  brianjmurrell  |
 Type:  defect   |   Status:  new
 Priority:  normal   |Component:
 |  undetermined
  Version:  unspecified  |   Resolution:
 Keywords:   |   Blocked By:
 Blocking:   |  Reproduced by developer:  0
Analyzed by developer:  0|
-+-

Comment (by brianjmurrell):

 > This is a FAQ.

 https://ffmpeg.org/faq.html doesn't even seem to contain the word DVD and
 the only FAQ about VOBs is https://ffmpeg.org/faq.html#Why-does-FFmpeg-
 not-see-the-subtitles-in-my-VOB-file_003f

 > A real DVD reading tool is necessary.

 What is the best known method/tool for doing this with ffmpeg then?  Or do
 I need to abandon ffmpeg for something like handbrake?

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Re: [FFmpeg-trac] #8064(undetermined:new): doesn't see full VOB track

[FFmpeg]

#8064: doesn't see full VOB track
-+-
 Reporter:   |Owner:
  brianjmurrell  |
 Type:  defect   |   Status:  new
 Priority:  normal   |Component:
 |  undetermined
  Version:  unspecified  |   Resolution:
 Keywords:   |   Blocked By:
 Blocking:   |  Reproduced by developer:  0
Analyzed by developer:  0|
-+-

Comment (by brianjmurrell):

 I'm aware of the need to concatenate multiple VOBs but this disk does not
 have a VTS_01_2.VOB.  Here are the list of files matching VTS_01*:

 {{{
 $ ls -l /var/run/media/brian/My\ DVD/VIDEO_TS/VTS_01*
 -r--r--r--. 1 brian brian 53248 Jul 24  2013 '/var/run/media/brian/My
 DVD/VIDEO_TS/VTS_01_0.BUP'
 -r--r--r--. 1 brian brian 53248 Jul 24  2013 '/var/run/media/brian/My
 DVD/VIDEO_TS/VTS_01_0.IFO'
 -r--r--r--. 1 brian brian   6664192 Jul 24  2013 '/var/run/media/brian/My
 DVD/VIDEO_TS/VTS_01_0.VOB'
 -r--r--r--. 1 brian brian 922195968 Jul 24  2013 '/var/run/media/brian/My
 DVD/VIDEO_TS/VTS_01_1.VOB'
 }}}

 VTS_01_0.VOB is the menu in front of the track to select chapters, etc.

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Re: [FFmpeg-trac] #8064(undetermined:new): doesn't see full VOB track

[FFmpeg]

#8064: doesn't see full VOB track
-+-
 Reporter:   |Owner:
  brianjmurrell  |
 Type:  defect   |   Status:  new
 Priority:  normal   |Component:
 |  undetermined
  Version:  unspecified  |   Resolution:
 Keywords:   |   Blocked By:
 Blocking:   |  Reproduced by developer:  0
Analyzed by developer:  0|
-+-

Comment (by Cigaes):

 Concatenating the VOB files is a step in the right direction but in no way
 a full solution. For starters, it may include menu junk in the video. A
 real DVD reading tool is necessary.

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Re: [FFmpeg-trac] #8064(undetermined:new): doesn't see full VOB track

[FFmpeg]

#8064: doesn't see full VOB track
-+-
 Reporter:   |Owner:
  brianjmurrell  |
 Type:  defect   |   Status:  new
 Priority:  normal   |Component:
 |  undetermined
  Version:  unspecified  |   Resolution:
 Keywords:   |   Blocked By:
 Blocking:   |  Reproduced by developer:  0
Analyzed by developer:  0|
-+-

Comment (by mkver):

 To make this a valid ticket, you need to provide a sample for us to
 reproduce this issue. But first you should test what Cigaes has said: Is
 there a VTS_01_2.VOB in this DVD? If so, then first test the "file"
 concat:/var/run/media/brian/My\
 DVD/VIDEO_TS/VTS_01_1.VOB\|/var/run/media/brian/My\
 DVD/VIDEO_TS/VTS_01_2.VOB

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Re: [FFmpeg-trac] #8064(undetermined:new): doesn't see full VOB track

[FFmpeg]

#8064: doesn't see full VOB track
-+-
 Reporter:   |Owner:
  brianjmurrell  |
 Type:  defect   |   Status:  new
 Priority:  normal   |Component:
 |  undetermined
  Version:  unspecified  |   Resolution:
 Keywords:   |   Blocked By:
 Blocking:   |  Reproduced by developer:  0
Analyzed by developer:  0|
-+-

Comment (by Cigaes):

 This is a FAQ. The VOB files in a DVD-Video structure are not self-
 contained video files. You need a tool that understands the structure.

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