DVD subtitle stream detection different if no title is specified #5
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In the above examples, -analyzeduration/-probesize are required to detect all the subtitle streams. If I re-run the commands on each title separately, but w/o the -analyzeduration/-probesize options, the result is only 8 subtitle streams for both title 1 and 2. That matches the result for title 2 when no title is specified. Is it possible in the case where no title is specified (ie -i dvd://dvd/VIDEO_TS), the -analyzeduration/-probesize values are only getting applied to the first input (ie title=1)? |
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I think that might be it. Take a look at this output: Notice only title 1 is using the correct -analyzeduration/-probesize values. |
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…-hls_segment_filename previously, specifying -hls_segment_filename meant s->base_output_dirname was never set, causing a segfault: (lldb) bt * thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x0) * frame #0: 0x00007fffbf7d82d0 libsystem_platform.dylib`_platform_strcmp + 80 frame #1: 0x00000001005f4dcf libavformat.57.dylib`io_open_default(s=0x000000010481cc00, pb=0x0000000104806020, url=0x0000000000000000, flags=2, options=0x0000000000000000) at options.c:107 frame #2: 0x0000000100528968 libavformat.57.dylib`hls_mux_init(s=0x000000010481cc00) at hlsenc.c:595 frame #3: 0x00000001005273cb libavformat.57.dylib`hls_write_header(s=0x000000010481cc00) at hlsenc.c:1518 frame #4: 0x00000001005c08d0 libavformat.57.dylib`write_header_internal(s=0x000000010481cc00) at mux.c:486 frame #5: 0x00000001005c0774 libavformat.57.dylib`avformat_write_header(s=0x000000010481cc00, options=0x00000001029026e8) at mux.c:539
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If vgtmpeg is run on a dvd/VIDEO_TS and the title is specified the number of subtitles detected may be different then when vgtmpeg is run without specifying a title.
Might be easier to see with an example. Here's a DVD with 3 subtitles. When vgtmpeg is run separately on each of the 3 titles, the number of subtitle streams is as follows:
vgtmpeg detects 12 subtitle streams for titles 1 and 2 and 2 subtitle streams for title 3.
If vgtmpeg is run without specifying a title:
It detects 12 subtitle streams for title 1 (as expected) and 2 for title 3 (as expected), but only 8 for title 2.
For comparison, here's the output from lsdvd:
A few things to note, although I don't know if these have anything to do with this issue:
This particular DVD exhibits the same subtitle doubling behavior identified in issue #4. So where lsdvd shows 6 subtitle streams for title 2, that corresponds to the 12 detected by vgtmpeg if you discount the duplicates.
lsdvd only shows 2 subtitle streams for title 1. The 4 subtitle streams missing are the 4 "Director" commentary streams and on this DVD, those streams are selected by going to the "Bonus" features.
Titles 1 and 2 are exactly the same length and in fact are exactly the same. I used mplayer -dumpstream to extract both title 1 and 2 and they are exactly the same:
$ sum -r title-1.vob title-2.vob
45060 6048958 title-1.vob
45060 6048958 title-2.vob
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