Changing HDTV MPEG2 file video id tags?

[nuhkka]

Been having a problem with Hauppage 1800 atsc card every now and then. Sometimes when I record a channel and then try to edit the file on Womble, it'll the seek file slowly and then re-transcode the file instead of just cutting it like it usually does. Normally Womble seeks the file fast and then outputs the file pretty quick since it doesn't transcode anything.

So then I figured out that Womble isn't reading the files as an mpeg2 even though they are. I tried this program called hdtvtompeg2 which did output files that Womble could edit and actually read them correctly. These are both from the same hdtv file but the one on the left is the file mpegtohdtv2 output.



Is there a quick way to do what hdtvtompeg2 does without having to re-copy the file all over again?

Also this doesn't happen much and it never occurred with a USB hdtv tuner I used before. Now I'm using a Hauppage 1800 pci card with the same software I used on my USB tuner (Arcsoft Totalmedia 3.5) so I'm not exactly sure why this is happening.

[poisondeathray]

Are you sure that's the same file ? Or perhaps "properties" aren't being read correctly? Duration and filesize increased significantly

Try mediainfo (view=>text) , copy & paste the text back here from the original and hdtvtompeg2 processed file

[nuhkka]

the reason the filesize is smaller is because hdtvtompeg2 cuts the output files at every 1024mb to make them dvd compatible


this one is 100mb because i chose that setting since i had already deleted the 1024mb one:

Video
ID                             : 17 (0x11)
Menu ID                        : 1 (0x1)
Format                         : MPEG Video
Format version                 : Version 2
Format profile                 : Main@High
Format settings, BVOP          : Yes
Format settings, Matrix        : Custom
Format settings, GOP           : M=3, N=15
Codec ID                       : 2
Duration                       : 1mn 17s
Bit rate mode                  : Variable
Bit rate                       : 10.0 Mbps
Maximum bit rate               : 19.4 Mbps
Width                          : 1 920 pixels
Height                         : 1 080 pixels
Display aspect ratio           : 16:9
Active Format Description      : Pillarbox 4:3 image
Frame rate                     : 29.970 fps
Standard                       : Component
Color space                    : YUV
Chroma subsampling             : 4:2:0
Bit depth                      : 8 bits
Scan type                      : Interlaced
Scan order                     : Top Field First
Compression mode               : Lossy
Bits/(Pixel*Frame)             : 0.161
Time code of first frame       : 15:58:29;28
Time code source               : Group of pictures header
Stream size                    : 92.6 MiB (93%)
Color primaries                : BT.709
Transfer characteristics       : BT.709
Matrix coefficients            : BT.709

Audio
ID                             : 20 (0x14)
Menu ID                        : 1 (0x1)
Format                         : AC-3
Format/Info                    : Audio Coding 3
Mode extension                 : CM (complete main)
Format settings, Endianness    : Big
Codec ID                       : 129
Duration                       : 1mn 16s
Bit rate mode                  : Constant
Bit rate                       : 384 Kbps
Channel(s)                     : 6 channels
Channel positions              : Front: L C R, Side: L R, LFE
Sampling rate                  : 48.0 KHz
Bit depth                      : 16 bits
Compression mode               : Lossy
Delay relative to video        : 853ms
Stream size                    : 3.48 MiB (3%)

when i try opening the original file mediainfo crashes..

[poisondeathray]

If the operation involves "cutting" or stream copy as part of making it compatible, then that isn't something you can do by "patching" or changing tags

If the problem only occurs on some recordings, that suggests the problem is with those recordings specifically, perhaps the program is doing other things like "fixing" it?

Even if the only operation was re-wrapping the container from .mpeg (mpeg2 program stream) to .ts (mpeg2 transport stream) , that involves copying the file again - that's not something you can do "in place"