[opendtv] Re: How About Portable ATSC Receivers?
- From: "John Willkie" <JohnWillkie@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 6 Apr 2005 20:19:13 -0700
Isn't that a series of -- VERY BASIC -- MPEG-2 problems? (using pids below
30, mismatched PMT pids) and not an ATSC problem?
John Willkie
----- Original Message -----
From: "Ron Economos" <k6mpg@xxxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Saturday, April 02, 2005 6:05 PM
Subject: [opendtv] Re: How About Portable ATSC Receivers?
> The SLD is a descriptor located in the TVCT, not the
> EIT0. See A_65B table 6.25a. The SLD from this
> DTV station lists the video and PCR as 0x11, the
> 1st audio stream as 0x14 and the 2nd audio stream
> as 0x15.
> SLD PCR pid = 0x0011
> SLD stream type = 0x02
> SLD elementary pid = 0x0011
> SLD language code =
>
> SLD stream type = 0x81
> SLD elementary pid = 0x0014
> SLD language code = spa
>
> SLD stream type = 0x81
> SLD elementary pid = 0x0015
> SLD language code = spa
>
> I am not explicitly printing the PMT with this tool.
> However, the PID statistics at the end can be used
> instead, and shows that PID's 0x11, 0x14 and 0x15
> do not exist in this stream while PID's 0x31, 0x34
> and 0x35 do.
>
> packets for pid 0 <0x0000> = 157, first = 869, last = 186713
> packets for pid 48 <0x0030> = 158, first = 273, last = 187309
> packets for pid 49 <0x0031> = 80614, first = 2, last = 187390
> packets for pid 52 <0x0034> = 4087, first = 14, last = 187373
> packets for pid 53 <0x0035> = 2718, first = 26, last = 187385
> packets for pid 7424 <0x1d00> = 502, first = 251, last = 186805
> packets for pid 7425 <0x1d01> = 1, first = 24338, last = 24338
> packets for pid 8187 <0x1ffb> = 195, first = 250, last = 186679
> packets for pid 8191 <0x1fff> = 98960, first = 1, last = 187392
>
> Ron
>
> John Willkie wrote:
>
> >First off, I don't understand your post.
> >
> >Could you explain what PIDs are in the VCT, and just how these are
> >mismatched to PIDs that you assert are in the PMT? (I suspect that you
mean
> >the SLD in the EIT-0 (missing events, apparently) versus the PMT PIDs,
but I
> >see none of that here.
> >
> >I have developed an application that can assess the MPEG-SI and PSIP in a
> >transport stream. I particularly love bad ts's. If you'd like me to run
> >this stream (I need at least 60 seconds) through my system, let me know.
> >
> >Here's what I see in your print out (which I cannot vouch for, since I do
> >not know the system)
> >
> >MGT; 4 EITS (0-3); RRT for region 1
> >
> >The EITs are 15 bytes in length. That means they either indicate 0
events
> >and provide no event information, or they list up to 255 events are
listed
> >in each EIT instance, but provide no event information. (14 bytes is the
> >minimum size of a PSIP table; 9 bytes for MPEG-2 header, 1 byte for ATSC
> >header, 4 bytes for CRC-32.)
> >
> >Only two of the EITs are listed in the MGT.
> >
> >The NIT listing is a hint that the encoder is probably a Tandberg (with
the
> >factory settings on NIT not changed), which is only confirmed by the
lowest
> >program_number in service being 3. (That's also the major PSIP problem;
> >mismatch of the program_number between TVCT and PMT.)
> >
> >NO PID mismatch; items listed n the MGT which are not found in the
> >transport stream segment provided. How long in time is the number of
> >frames?
> >
> >I've seen EIT-s with duty cycles of 11000 ms (recommendation 500 ms).
Means
> >that people tuning to the channel have to wait up to 11 seconds for EPG
> >information. Kinda slows down channel surfing.
> >
> >John Willkie
> >----- Original Message -----
> >From: "Ron Economos" <k6mpg@xxxxxxxxxxx>
> >To: <opendtv@xxxxxxxxxxxxx>
> >Sent: Friday, April 01, 2005 3:23 AM
> >Subject: [opendtv] Re: How About Portable ATSC Receivers?
> >
> >
> >
> >
> >>Here's my favorite example of DTV apathy. I've
> >>dumped the Transport Stream from KFSF-DT below.
> >>KFSF-DT transmits from Sutro tower in San Francisco
> >>with 150 kW ERP. It's a TeleFutura affiliate.
> >>They have a great signal in Milpitas (tons better
> >>than the analog channel) and their SD video quality
> >>is really quite nice.
> >>
> >>As you can see, the TVCT PID's are mismatched from
> >>the PMT PID's. This will cause almost every ATSC
> >>receiver to display a black screen and no audio.
> >>It's been like this since January when they attempted
> >>to meet the 0x30 and above PID requirement.
> >>
> >>I think it may be possible that this DTV station
> >>has zero viewers.
> >>
> >>Ron
> >>
> >>program = 3, video channel = 1, audio channel = 1
> >>
> >>MGT tables defined = 6
> >>
> >>MGT table type = 0x0000
> >>MGT table type pid = 0x1ffb
> >>MGT table type version = 0x04
> >>MGT table bytes = 0x0000006d
> >>MGT table desc bytes = 0x0000
> >>
> >>MGT table type = 0x0100
> >>MGT table type pid = 0x1d00
> >>MGT table type version = 0x00
> >>MGT table bytes = 0x0000000e
> >>MGT table desc bytes = 0x0000
> >>
> >>MGT table type = 0x0101
> >>MGT table type pid = 0x1d01
> >>MGT table type version = 0x00
> >>MGT table bytes = 0x0000000e
> >>MGT table desc bytes = 0x0000
> >>
> >>MGT table type = 0x0102
> >>MGT table type pid = 0x1d02
> >>MGT table type version = 0x00
> >>MGT table bytes = 0x0000000e
> >>MGT table desc bytes = 0x0000
> >>
> >>MGT table type = 0x0103
> >>MGT table type pid = 0x1d03
> >>MGT table type version = 0x00
> >>MGT table bytes = 0x0000000e
> >>MGT table desc bytes = 0x0000
> >>
> >>MGT table type = 0x0301
> >>MGT table type pid = 0x1ffb
> >>MGT table type version = 0x00
> >>MGT table bytes = 0x000003e0
> >>MGT table desc bytes = 0x0000
> >>
> >>MGT desc bytes = 0x0000
> >>MGT CRC = 0x1b88f79a, 74, 74
> >>
> >>EIT0 events defined = 0
> >>
> >>Program Number = 0 (0x0000), Program Map PID = 4094 (0x0ffe)
> >>Program Number = 3 (0x0003), Program Map PID = 48 (0x0030)
> >>program descriptor = 0x05, 0x04, 0x47, 0x41, 0x39, 0x34
> >>program descriptor = 0x10, 0x06, 0xc0, 0xaf, 0xc8, 0xc0, 0x02, 0x00
> >>program descriptor = 0xa3, 0x0d, 0x01, 0x73, 0x70, 0x61, 0x01, 0x00,
0x00,
> >>
> >>
> >0x05, 0x50, 0x72, 0x6f, 0x67, 0x31
> >
> >
> >>ES descriptor for stream type 0x02 = 0x02, 0x03, 0x22, 0x48, 0x5f
> >>ES descriptor for stream type 0x02 = 0x06, 0x01, 0x02
> >>ES descriptor for stream type 0x81 = 0x05, 0x04, 0x41, 0x43, 0x2d, 0x33
> >>ES descriptor for stream type 0x81 = 0x81, 0x06, 0x08, 0x39, 0x05, 0x00,
> >>
> >>
> >0x00, 0x00
> >
> >
> >>ES descriptor for stream type 0x81 = 0x0a, 0x04, 0x73, 0x70, 0x61, 0x00
> >>ES descriptor for stream type 0x81 = 0x06, 0x01, 0x01
> >>ES descriptor for stream type 0x81 = 0x05, 0x04, 0x41, 0x43, 0x2d, 0x33
> >>ES descriptor for stream type 0x81 = 0x81, 0x06, 0x08, 0x31, 0x05, 0x00,
> >>
> >>
> >0x00, 0x00
> >
> >
> >>ES descriptor for stream type 0x81 = 0x0a, 0x04, 0x73, 0x70, 0x61, 0x00
> >>ES descriptor for stream type 0x81 = 0x06, 0x01, 0x01
> >>
> >>TVCT number of channels = 1
> >>
> >>TVCT short name = KFSF -
> >>TVCT channel number = 66.1
> >>TVCT modulation mode = 0x04
> >>TVCT channel TSID = 0x0000
> >>TVCT program number = 0x0001
> >>TVCT service type = 0x0002
> >>TVCT source id = 0x0001
> >>TVCT desc bytes = 0x003d
> >>
> >>SLD PCR pid = 0x0011
> >>SLD stream type = 0x02
> >>SLD elementary pid = 0x0011
> >>SLD language code =
> >>
> >>SLD stream type = 0x81
> >>SLD elementary pid = 0x0014
> >>SLD language code = spa
> >>
> >>SLD stream type = 0x81
> >>SLD elementary pid = 0x0015
> >>SLD language code = spa
> >>
> >>Extended Channel Name = (Identification and Address)
> >>
> >>TVCT additional desc bytes = 0x0000
> >>TVCT CRC = 0xda1c46d0, 100, 100
> >>
> >>Sequence Header found
> >>11 frames before first Sequence Header
> >>Horizontal size = 704
> >>Vertical size = 480
> >>Aspect ratio = 4:3
> >>Frame rate = 29.97
> >>Sequence header bitrate = 9200000 bps
> >>Progressive Sequence = 0
> >>First Video PTS = 0x52962519
> >>First Audio PTS = 0x52962ecd, -396
> >>Audio Bitrate = 384000, Audio Sampling Rate = 48000
> >>Audio Mode = 2/0, bsid = 8, bsmod = 0
> >>
> >>EIT1 events defined = 0
> >>
> >>packets for pid 0 <0x0000> = 157, first = 869, last = 186713
> >>packets for pid 48 <0x0030> = 158, first = 273, last = 187309
> >>packets for pid 49 <0x0031> = 80614, first = 2, last = 187390
> >>packets for pid 52 <0x0034> = 4087, first = 14, last = 187373
> >>packets for pid 53 <0x0035> = 2718, first = 26, last = 187385
> >>packets for pid 7424 <0x1d00> = 502, first = 251, last = 186805
> >>packets for pid 7425 <0x1d01> = 1, first = 24338, last = 24338
> >>packets for pid 8187 <0x1ffb> = 195, first = 250, last = 186679
> >>packets for pid 8191 <0x1fff> = 98960, first = 1, last = 187392
> >>mpeg frames = 432, video fields = 864
> >>
> >>
> >>
>
>
>
>
>
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