HMT File Format
Revision as of 01:16, 25 November 2014 by Ezra pound (talk | contribs)
See also update notes below
Offset Size Content ------ ----- ---------------------------------- Header Block, Size 0x1004 (4100) bytes --------------------------------------------- 0x0000 2 byte 0x1701 Constant. 0x0000 126 byte All Nulls.Constant 0x0080 string 254 byte max Recording file path e.g. "/media/sda1/My Video/" (not needed when creating hmt) 0x017F string 256 byte max Recording date-extended file name e.g. "The One Show_21010816_1817" 0x0280 4 byte 0x11223344 Recording start time (Epoch format) 0x0284 4 byte 0x11223344 Recording end time (Epoch format) 0x0288 4 byte 0x00000000 0x028C 1 byte 0x02 Recording 00=zero length, 02=valid, 03=scrambled, 04=failed 0x028D 1 byte 0x00 Flags byte. bit 2 00000100 'Locked' flag. 1 = Locked. bit 3 00001000 'New' flag. 0 = New. 0x028E 1 byte 0x00 Flags byte. bit 0 00000001 On-Disk Encrypted flag. 1 = Encrypted. 0 = Decrypted bit 1 00000010 Thumbnail exists flag. 1 = Yes. 0 = No 0x0290 1 byte 00 Failed recording code, 05=loss of signal 0x0294 4 bytes 0x44332211 Played time in seconds. (Used by resume). 0x00 if unplayed or played to end. 0x0298 1 byte 0x00 Bookmark count 0x029A string 48 chars max. Program name for Media List. 0x031C 4 bytes Start of bookmark table. Maximum 32 x 4 byte entries (seconds from start). 0x03DC 1 byte 0x00 Flags byte. bit 1 00000010 'Encrypted' flag. 1 = Encrypted. Used to determine if decryption on copy to USB is allowed. bit 2 00000100 'Copy Allowed' flag. 1 = copy allowed. (If zero, Number of allowed copies is in offset 0x431) 0x03E0 2 byte 0xFF00 'Guide' flag for Media List.0xFF00 = Guide off. 0x0101 = Guide on. 0x03E2 1 byte 0x15 String header (only if guide is on). 0x03E5 string 74 chars max. Guide text for Media list.(only if guide is on). 0x0431 1 byte 0x00 Number of copies allowed when Unlimited Copies' flag is zero in 0x3DC 0x0434 2 byte 0x22110 0x0458 4 byte 0x44332211 Channel number. 0x045C 1 byte 0x15 String header. 0x045D string 42 chars max. Channel name. 0x0488 2 byte 0x2211 Service ID (SID). 0x048A 2 byte 0x2211 Transport Stream ID (TSID). 0X048C 2 byte 0x2211 Originating Network ID (ONID). 0x048E 2 byte 0x2211 Program Map Table (PMT) PID. 0x0490 2 bytes 0x2211 Video PID. 0x0493 1 byte 0x20 Constant. 0x0494 2 bytes 0x2211 Video PID. 0x0498 1 byte 0x11 Video Type MPEG2=0x01, H264=0x02. 0x049C 2 bytes 0x2211 Audio PID. 0x04A0 1 byte 0x00 Audio Type MPEG=0x01 AC3=0x03 AAC=0x07. 0x04A5 1 byte 0x20 Constant. 0x04AD 1 byte 0x20 Constant 0x04B8 1 byte 0x01 Constant?? 0x04BC 1 byte 0x00 Video type flag for Media list. 0x01 = SD. 0x02 = HD. 0x04C0 1 byte 0x01 Constant ?? 0x04C4 1 byte 0xFF Constant ?? 0x04F8 4 byte 0x44332211 Program scheduled start date & time (Epoch format). 0x04FC 4 bytes 0x44332211 Program scheduled duration. (seconds). 0x0514 1 byte 0x00 Program genre code. (see table) 0x0516 3 bytes 0x106937 String header. 0x0519 string 48 byte max. Program Name for Guide & iPlate. 0x0616 3 bytes 0x106937 String header. 0x0619 string 252 byte max. Program synposis text for Media list. 0x0710 2 bytes 0x2211 EPG data - Event ID 0x073A 1 byte 0x00 'AC3' Flag. 0x00 = MPEG. 0x01=AC3. 0x073B 2 bytes 0xFF00 'Guide' flag for iPlate. 0xFF00 = Guide off. 0x0101 = Guide on. 0x073D 4 bytes 0x656E6700 Null terminated string 'eng' 0x0741 1 byte 0x15 String header(only if guide is on). 0x0742 string 74 chars max. Guide text for iPlate.(only if guide is on). 0x0798 128 byte Data block. Purpose unknown. Contains data block common to all HMT files. ---------------------------------------------------------------------------------------------------------------------------------- 0x1000 4 byte 0x44332211 Number of EPG Blocks following ------ ----- ---------------------------------- EPG Header List Block, Size 8188 bytes (starts at 0x1004) --------------------- 0x0000 32 byte blocks Copy of 32 byte header from EPG blocks following. One entry for each EPG block. 0x0020 0x0040 Next EPG block header (if any) ------ ----- ---------------------------------- EPG Block type 02, Size 704 bytes,including 32 byte header (starts at 0x3000)-- ++++++ Start of 32 byte header +++++++++ 0x0000 4 byte 0x02000000 0x0004 4 byte 0x00000000 Time in seconds from start of recording to change the iPlate info to this EPG block 0x0008 4 byte 0x00300000 12288. Byte Offset to start to EPG block.(increments by 704 for each EPG entry. 0x000C 4 byte 0xA0020000 0x0010 16 byte Unused ++++++ End of 32 byte header ++++++++++ 0x0020 4 byte 0x44332211 Program scheduled start date & time (Epoch format). 0x0024 4 bytes 0x44332211 Program scheduled duration. (seconds). 0x0028 1 byte 0x04 0x003C 1 byte 0x11 Program genre code. (see table) 0x003E 3 byte 0X106937 String Header. 0x0041 string Program name for EPG. 0x013E 3 byte 0X106937 String Header. 0x0141 string 252 byte max. Program synposis text for iPlate. 0x0262 1 byte 0x11 Flag 0x0263 2 byte 0xFF00 Guide flag. 0xFF00 = Guide off. 0x0101 = Guide on. 0X0265 string 0x656E67 "eng". Language for guide text. 0x0268 1 byte 0x00 Null terminator for string. 0x0269 3 byte 0x106937 String header.(only if guide is on) 0x026A string 74 chars max. Guide text for iPlate.(only if guide is on) 0x02BC 4 byte 0xC0320000 12288 + 704. Byte offset to start of next EPG block. Genre Code Table ---------------- 0x00 = Unclassified 0x10 = Movie 0x20 = News and Factual 0x30 = Entertainment 0x40 = Sport 0x50 = Childrens 0x60 = Education 0xA0 = Lifestyle 0xF0 = Drama File analysis by raydon
Notes by escat :-
a) The file name field has moved from offset 017F 0180. Both variants may be found depending on the age of the recording. Although the Humax software doesn't appear to use this field, other CF packages may do so. For example, af123 has already modified the hmt utility to accommodate this change. However, the Nicesplice package still appears to create hmt files with the old format, even when the original recording had the new format. b) af123 also informs me that offset 073D is used to hold the character 'E' for recordings that have been stripped of their EPG frames. (Maybe, it's my choice of programmes, but I've almost never seen an htm file containing the reported 'eng' characters!)
