HMT File Format
Standard .hmt file format
Offset Size Content
------ ----- ---------------------------------- Header Block, Size 0x1004 (4100) bytes ---------------------------------------------
0x0000 2 byte 0x1701 Constant.
0x0002 126 bytes All Nulls. Constant.
0x0080 string 254 byte max Recording file path e.g. "/media/sda1/My Video/" (not needed when creating hmt)
0x0180 string 256 byte max Recording date-extended file name e.g. "The One Show_21010816_1817"
0x0280 4 byte 0x44332211 Recording start time (Epoch format)
0x0284 4 byte 0x44332211 Recording end time (Epoch format)
0x0288 4 byte 0x44332211 Recording duration in seconds - set but not used by HumaxTV(?), uses End-Start instead
0x028C 1 byte 0x02 Recording 00=zero length, 01=Recording in progress/power loss, 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
bit 2 00000100 1 = Recording failed, Loss of Power (not set by firmware(?) uses 0x28C=01 instead)
bit 3 00001000 1 = Recording deleted by Auto Delete
0x0290 1 byte 00 Failed recording code - see table below.
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 'Copy Limited' flag. 0 = Unlimited copies. If set, copy count limit is in offset 0x431.
bit 2 00000100 'Encrypted' flag. 1 = Decryption allowed. Determines if decryption on copy to USB is allowed.
0x03E0 1 byte Media list Guidance Type - see table below.
0x03E1 1 byte Media list Guidance Mode - see table below.
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 'Copy Limited' flag is set in 0x3DC
0x0434 2 byte 0x2211 Daylight Savings seconds offset. 0x0E10 = BST, 0x0000 = GMT
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 for TV recording, or Audio PID for radio recording.
0x0492 2 bytes 0x0020 Constant.
0x0494 2 bytes 0x2211 Video PID, or 0x0020 for radio recording.
0x0498 1 byte 0x11 Video Type MPEG2=0x01, H264=0x02, Radio-0x00.
0x049C 2 bytes 0x2211 Audio PID for both TV and radio recordings.
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 Recording type. 0x01=TV, 0x02=Radio.
0x04BC 1 byte 0x00 Video type flag for Media list. 0x01 = SD. 0x02 = HD, 0x00 = Radio.
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.
0x0716 2 bytes EPG data - Event ID
0x073B 1 byte iPlate Guidance Type - see table below.
0x073C 1 byte iPlate Guidance Mode - see table below.
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.
Recordings not using padding (Accurate Recording) have a size of 2072 bytes so anything beyond here is not necessary to create an hmt file.
0x0818 2024 bytes All Nulls.Constant
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 01, Size 192 bytes (starts at 0x3000)---------------------------
0x0000 1 byte 0x01 Constant
0x0009 1 byte 0x30 Constant
0x000C 1 byte 0xA0 Constant
The remaining 160 bytes in this block mirrors those contained in the main header block at offset 0x458 to 0x4F7
0x0020 4 byte Channel Number
0x0024 1 byte 0x15 String header.
0x0025 43 byte Channel name.
0x0050 2 byte Program ID (SID).
0x0052 2 byte Transport Stream ID (TSID)
0X0054 2 byte Originating Network ID (ONID).
0x0056 2 byte Program Map Table (PMT).
0x0058 2 byte Video PID.
0x005A 2 bytes 0x0020 Constant.
0x005C 2 byte Video PID
0x0060 1 byte Video Type MPEG2=0x01, H264=0x02.
0x0064 2 byte Audio PID.
0x0068 1 byte Audio Type MPEG=0x01 AC3=0x03 AAC=0x07.
0x006D 1 byte 0x20 Constant
0x0075 1 byte 0x20 Constant
0x0080 1 byte 0x01 Constant
0x0084 1 byte Video type flag for Media list. 0x01 = SD. 0x02 = HD.
0x0088 1 byte 0x01 Constant
0x008C 1 byte 0xFF Constant
------ ----- ----- EPG Block type 02(event block) Size 704 bytes,including 32 byte header (first block starts at 0x30C0) -----
++++++ 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 1 byte Guidance Type - see table below.
0x0264 1 byte Guidance Mode - see table below.
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 (0x3000) + 704. Byte offset to start of next EPG block.
Fields
Guidance Flag ------------- Type Mode Meaning ---- ---- ------- ff 0 Guidance off 0 * Guidance on 1 0 General guidance on (e.g. strobe lighting) 1 1 Guidance on Genre Code Table ---------------- 0x00 = Unclassified 0x10 = Movie 0x20 = News and Factual 0x30 = Entertainment 0x40 = Sport 0x50 = Childrens 0x60 = Entertainment 0x70 = News and Factual 0x80 = News and Factual 0x90 = Education 0xA0 = Lifestyle 0xF0 = Drama Failed Recording Codes ---------------------- 1: The disk was full 2: Conflicted with another recording 3: The maximum number of files per folder was reached 4: Recording (less than 30 secs) may not be stored 5: Lack of signal 8: Conflicted with another recording 13: Incomplete: the disk was full 15: No storage device detected 16: Incomplete: the USB storage device was removed 17: The programme appears not to have been broadcast 18: Loss of power 19: Conflicted with higher priority recording 20: Unable to track programme String headers (Character tables As defined in EN 300 468 Annex A.2). -------------------------------------------------------------------- 0x15 = UTF-8 0x106937 = ISO/IEC 6937 (unconfirmed use of BCD to denote format) String header parsing --------------------- If first byte is 0x20 or above skip 0 bytes, if 0x10 then skip 3 bytes, if 0x1F then skip two bytes, otherwise skip 1 byte. Original file analysis by raydon Additional information provided by af123 and GrahamCobb.
Custom Firmware Extensions
0x0010 1 byte Series number.
0x0011 1 byte Episode number.
0x0012 1 byte Episodes in series.
0x073D 4 bytes 0x656E6700 Null terminated string 'eng'
First character 'E' indicates recording has been shrunk.
Second character 'N' indicates recording has been de-duped.
Third character 'G' indicates ad-detection has been performed.
Notes
Notes by escat :-
- The file name field has moved from offset 017F to 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.
