| Tuesday, October 15th, 2013, 00:06 UTC | ||
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| [10:39:10] | stuartm: | skd5aner: please |
| [12:32:09] | stichnot: | danielk221: re my cc608 questions/comments from yesterday. I see now that the bulk of the parsing in mpeg_decode_user_data() in libavcodec/mpeg12.c is MythTV additions, which makes the situation much more clear. |
| [12:43:30] | tonsofpcs: | stichnot: re:cc608 and fields, there are two data streams – one in each field, each data stream can contain multiple sub-streams that are flagged as CC1,CC3, or TC (or on the other field, CC2, CC4, or XDS)* |
| [12:43:49] | tonsofpcs: | *I might have the numbers and TC/XDS mixed up here, but that's the basic point. If you want, I can pull some reference and tell you exactly where each should be. |
| [12:45:31] | tonsofpcs: | sorry, you can also have two channels of "TEXT" in the stream on either field. |
| [12:57:34] | stichnot: | tonsofpcs: For cc608 closed captions, it seems that one should ignore the field number, and combine everything into CC1 or CC3, right? |
| [13:51:53] | danielk221: | stichnot: The field # is the odd and even fields of the interlaced video. CC1 and CC2 are placed in field 1, while CC3 and CC4 are placed in field 2. XDS can technically go in either field, but in practice is found in field 2. There is no 3rd field that is just some overloading of the field specifier in ffmpeg. |
| [13:52:56] | danielk221: | Generally CC1 will be used for primary language captions and CC3 is used for secondary language captions, while CC2 and CC4 are left unused since they share very limited bandwidth with CC1 and CC3, resp. |
| [13:55:31] | danielk221: | There are multiple ways that this data is crammed into mpeg user data, of which we support maybe three or four (there are other methods as well but we hit the most popular ones). |
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| [14:20:53] | stichnot: | danielk22: This particular sample seems to be spreading SCTE-20 CEA-608 data across arbitrary field specifiers. If I ignore the field number in general, I don't know what it would do with other cc608 recordings. Any suggestions? |
| [14:22:08] | danielk22: | stichnot: This is just bad input. I can't think of any way to support that. |
| [14:23:05] | danielk22: | If you allow data from any field you'll end up mixing CC1 and CC3 and you will have English and Spanish captions jumbled together for broadcasters that follow the rules. |
| [14:40:53] | stichnot: | danielk22: I was thinking that this would merge CC1/CC2 into CC1, and CC3/CC4 into CC3 |
| [14:43:37] | danielk22: | Merging those would be less detrimental, but still incorrect. But 'field' divides CC1&CC2 from CC3&CC4, something else signals which of the muxed streams is being sent currently. |
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| [15:05:05] | tonsofpcs: | danielk22: to be fair, there's a third and fourth field in a superframe but no one has time for those anymore ;) |
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| [16:01:56] | stichnot: | danielk22: I wonder if there's something that's supposed to be special about the fact that the captions are sent as SCTE-20 user data. |
| [16:02:48] | danielk22: | It is possible.. I believe SCTE-20 is a free download.. let me see if I can find it.. |
| [16:03:32] | danielk22: | www.scte.org/documents/pdf/standards/SCTE%2020%202012.pdf |
| [16:03:49] | stuarta: | \o/ |
| [16:04:43] | stichnot: | yeah, that's the doc I've been reading |
| [16:05:14] | danielk22: | Figure 5–2 on page 12 is probably all we need to confirm if we're doing things right, right? |
| [16:05:48] | danielk22: | Maybe we're decoding cc_priority and calling it field_number or some such? |
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| [16:10:00] | stichnot: | I believe we are correctly parsing everything up to but not including non_real_time_video_count |
| [16:10:39] | stichnot: | based on the code in libavcodec/mpeg12.c, after the comment "SCTE 20 encoding of CEA-608" |
| [16:14:08] | danielk22: | I'm pretty sure we don't need to support the non-real-time video stuff. |
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| [16:17:49] | stichnot: | At this point, my best bet may be to step through ccextractor and mythccextractor side by side and see where they diverge |
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| [19:01:25] | Ribeirsg: | Greetings from Portugal :) i wounder if someone could give some help ... i want to install mythtv on a Motorola Vip 1232E is this possible? |
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| [19:07:29] | Ribeirsg: | Greetings from Portugal :) i wounder if someone could give some help ... i want to install mythtv on a Motorola Vip 1232E is this possible? |
| [19:09:24] | stuartm: | Ola |
| [19:13:55] | stuartm: | Eu sugiro que você pergunte no canal #mythtv-users |
| [19:14:32] | stuartm: | excuse my portuguese |
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| [19:19:14] | stuartm: | preciso practicar |
| [19:20:31] | stuartm: | praticar |
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| [19:41:27] | Ribeirsg: | stuartm your portuguese is perfect you said it right |
| [19:41:30] | Ribeirsg: | looool :) |
| [19:41:57] | stuartm: | good :) |
| [19:43:10] | Ribeirsg: | i've tried to make the same question in #mythtv-users but no one anwser me :/ |
| [19:45:15] | Ribeirsg: | i've look in everywhere, hopping that i can find some use for my 5 stb's and i can't find nothing on anywhere |
| [19:46:01] | stuartm: | I don't know if anyone has tried installing MythTV on that STB |
| [19:46:55] | stuartm: | only now are people trying to optimise MythTV for installation onto embedded platforms |
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| [19:49:25] | stuartm: | Eu não posso ajudar muito |
| [19:50:10] | stuartm: | precisa esperar :) |
| [19:50:18] | Ribeirsg: | i've seem somewhere that some user use mythtv on a Motorola vip1216 |
| [19:52:24] | Ribeirsg: | ahahah i can wait for sure :) i want use my old stb's as a media center let see if i can do it :) |
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| [22:40:55] | dekarl1: | Man, how can a fix in the reencoding transcode solve issues in lossless transcode? http://www.mythtv.org/pipermail/mythtv-users/ . . . /354678.html http://xkcd.com/552/ |
| [22:41:01] | dekarl1 is now known as dekarl | |
| [22:48:19] | dekarl: | wagnerrp: IIRC you got to sign an NDA to look at the raw data or wait until a user posts a crash dump manually like https://bugs.launchpad.net/ubuntu/+source/mythtv/+bug/974395 . looking at https://bugs.launchpad.net/ubuntu/+source/mythtv/+bug/1239867 it appears as if this is being relaxed, notice the creator "bug bridge" https://launchpad.net/~whoopsie-daisy-bug-bridge |
| [22:50:57] | wagnerrp: | yeah, tgm4883 opened them up for me yesterday |
| [22:51:37] | superm1: | tgm4883: how did that bug bridge make the bugs? |
| [22:51:48] | superm1: | does it happen automagically when a lot of the same issues are reported? |
| [22:51:50] | tgm4883: | superm1, you just click "create bug report" |
| [22:52:03] | tgm4883: | superm1, not sure, I noticed that it was already done on some of theme |
| [22:52:03] | superm1: | and does she include logs or you need to do that part |
| [22:52:05] | tgm4883: | them* |
| [22:52:16] | tgm4883: | I copied over the stuff |
| [22:52:34] | tgm4883: | I think it only automatically opens a bug if the user goes though the process with apport/whoopsie |
| [22:53:02] | tgm4883: | superm1, but what I did is on errors.ubuntu.com there is a "create bug" link on the right if there isn't already a bug report on that issue |
| [22:53:09] | tgm4883: | otherwise it just lists the bug number |
| [22:53:34] | superm1: | ah which is offered if you have errors.ubuntu.com access i guess |
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