smartLabs tsMuxeR: Transport Stream muxer

[jagaskywalker]

I have a Sony AVCHD camcorder writing on Memory Stick. I can reproduce on the PS3 the AVCHD content directly on the memory stick (ac3 included)

I would be very much interested in transforming existing bluray backups (large files) into blurays with smaller files (FAT32 compatible), like fico99 describes, in order to play them in an external FAT32 hard disk.

If it helps I can send Roman a sample of the AVCHD structure used in the memory sticks (I also noticed that it uses MTS files instead of m2ts...)

Thanks for the good work

J


I don't think that's the problem because currently I am testing with small HDV and AVCHD samples (M2TS files are not bigger than 200MB).

However, when I look at the BDMV File Structure generated by Nero Vision 5, I see that in the \BDMV\STREAM folder there are files called 00000.MTS, 00001.MTS, ... instead of M2TS files?

The BDMV File Structure is a bit different too:

\BDMV
\BDMV\BACKUP (INDEX.BDM, MOVIEOBK.BDM)
\BDMV\BACKUP\CLIPINF (00000.CPI, 00001.CPI, ...)
\BDMV\CLIPINF\PLAYLIST (00000.MPL, 00001.MPL, ...)
\BDMV\PLAYLIST (00000.MPL, 00001.MPL, ...)
\BDMV\STREAM (00000.MTS, 00001.MTS, ...)
INDEX.BDM
MOVIEOBK.BDM

To let the PS3 recognize & play this 'AVCHD DVD' BDMV File Structure directly from a FAT32 formatted Storage Card, USB Stick or Ext HDD, you need to put the complete BDMV File Structure under a root folder called 'AVCHD':

e.g. I:\AVCHD\BDMV\...

[Atak_Snajpera]

If it helps I can send Roman a sample of the AVCHD structure used in the memory sticks (I also noticed that it uses MTS files instead of m2ts...)
MTS = M2TS. It's just different extension but format is the same. Canon camcorders also use MTS extension.

[jagaskywalker]

When moving the content from the memory stick to the computer hard disk it creates m2ts files (using Sony provided software). I did not check if they are identical files (binary identical). It does not move to the computer the remaining AVCHD files structure.

Apparently it is possible to move back the m2ts files to the memory stick in order to play them in the camcorder. I did not check this though.


MTS = M2TS. It's just different extension but format is the same. Canon camcorders also use MTS extension.

[oldpainless]

oldpainless

No. I do not have a plan to support HD-DVD as output format.


Ok, thanks

K

[Nullity]

What is the standard format for BD5 and BD9 disks ?
AVCHD should be on udf 2.5 ? (or 2.6 ?)
What is the difference between the two formats ?


p.s.:
No one has issues with subtitles in blu-ray outputs ?
(I get permananent subtitle on PS3 if I add a sup file in tsmuxer. :confused: (720p project) )

Did you have to create the .sup file? if so, how did you output it at 720p? SUPread can currently only output at 1080p and I've been trying to find another program to convert srt subtitles to sup at 720 res.

[drmpeg]

@roman76r, you seem to be doing a great job here!

My personal favourite container currently is Matroska. Mainly for the following two reasons:

(1) FLAC support.
(2) The ability to give audio tracks a name.

Now I'm wondering: Do you think there's a chance to extend the TS specification somehow to allow muxing of FLAC tracks (without transcoding them to something else) and giving audio tracks a name? Is there a central place where such TS format extensions are discussed and agreed upon? Of course it would be bad if every programmer invented his own way of adding new things to the TS container...
You can always use stream_type 0x6 (ITU-T Rec. H.222.0 | ISO/IEC 13818-1 PES packets containing private data). However, IMHO this stream_type is already overloaded since it's used for AC3 (in Europe) and DTS.

It's much better to have a unique stream_type, so that demuxers don't have to parse the audio stream to determine what it is. This is why xport doesn't work for non Blu-ray DTS.

Ron

[madshi]

You can always use stream_type 0x6 (ITU-T Rec. H.222.0 | ISO/IEC 13818-1 PES packets containing private data). However, IMHO this stream_type is already overloaded since it's used for AC3 (in Europe) and DTS.
Oh, stream_type 0x6 can also be used for DTS? That's good to know! I currently have it hardwired to AC3 in my tool... :eek:

It's much better to have a unique stream_type, so that demuxers don't have to parse the audio stream to determine what it is. This is why xport doesn't work for non Blu-ray DTS.
So who decides about new stream_type values for new codecs? Is there a central place where one can request assignment of new stream_types?

Thanks!

[DVFreak]

i have a Problem at the End at 97% remuxing off an Evo to m2ts
This Problem is on this File every Time i will remux it

here the Log from the Muxer and the Microsoft Konsole

<?xml version="1.0" encoding="UTF-16"?>
<DATABASE>
<EXE NAME="tsMuxeR.exe" FILTER="GRABMI_FILTER_PRIVACY">
<MATCHING_FILE NAME="tsMuxeR.exe" SIZE="178688" CHECKSUM="0x6D0F9CF2" MODULE_TYPE="WIN32" PE_CHECKSUM="0x3667F" LINKER_VERSION="0x0" LINK_DATE="04/05/2008 13:52:42" UPTO_LINK_DATE="04/05/2008 13:52:42" />
<MATCHING_FILE NAME="tsMuxerGUI.exe" SIZE="269824" CHECKSUM="0xD280622" BIN_FILE_VERSION="1.7.4.58" BIN_PRODUCT_VERSION="1.7.4.58" PRODUCT_VERSION="1.0.0.0" FILE_DESCRIPTION="" COMPANY_NAME="" PRODUCT_NAME="" FILE_VERSION="1.7.4.58" ORIGINAL_FILENAME="" INTERNAL_NAME="" LEGAL_COPYRIGHT="" VERFILEDATEHI="0x0" VERFILEDATELO="0x0" VERFILEOS="0x4" VERFILETYPE="0x1" MODULE_TYPE="WIN32" PE_CHECKSUM="0x51C6B" LINKER_VERSION="0x0" UPTO_BIN_FILE_VERSION="1.7.4.58" UPTO_BIN_PRODUCT_VERSION="1.7.4.58" LINK_DATE="06/19/1992 22:22:17" UPTO_LINK_DATE="06/19/1992 22:22:17" VER_LANGUAGE="Russisch [0x419]" />
</EXE>
<EXE NAME="kernel32.dll" FILTER="GRABMI_FILTER_THISFILEONLY">
<MATCHING_FILE NAME="kernel32.dll" SIZE="1063424" CHECKSUM="0xD6320085" BIN_FILE_VERSION="5.1.2600.3311" BIN_PRODUCT_VERSION="5.1.2600.3311" PRODUCT_VERSION="5.1.2600.3311" FILE_DESCRIPTION="Client-DLL für Windows NT-Basis-API" COMPANY_NAME="Microsoft Corporation" PRODUCT_NAME="Betriebssystem Microsoft® Windows®" FILE_VERSION="5.1.2600.3311 (xpsp.080212-0005)" ORIGINAL_FILENAME="kernel32" INTERNAL_NAME="kernel32" LEGAL_COPYRIGHT="© Microsoft Corporation. Alle Rechte vorbehalten." VERFILEDATEHI="0x0" VERFILEDATELO="0x0" VERFILEOS="0x40004" VERFILETYPE="0x2" MODULE_TYPE="WIN32" PE_CHECKSUM="0x1107BE" LINKER_VERSION="0x50001" UPTO_BIN_FILE_VERSION="5.1.2600.3311" UPTO_BIN_PRODUCT_VERSION="5.1.2600.3311" LINK_DATE="02/12/2008 10:24:48" UPTO_LINK_DATE="02/12/2008 10:24:48" VER_LANGUAGE="Deutsch (Deutschland) [0x407]" />
</EXE>
</DATABASE>

SmartLabs tsMuxeR. Version 1.7.4(b) http://www.smlabs.net
Decoding E-AC3 (DD+) stream (track 2): Bitrate: 768Kbps Sample Rate: 48KHz Channels: 6
VC-1 muxing fps not set. Get fps from stream.
Decoding VC-1 stream (track 1): Profile: Advanced@3 Resolution: 1920:1080i Frame rate: 29.97
E-AC3 (DD+) bad frame detected. Resync stream.
Decoding E-AC3 (DD+) stream (track 2): Bitrate: 768Kbps Sample Rate: 48KHz Channels: 6

MUXOPT --no-pcr-on-video-pid --new-audio-pes --vbr --vbv-len=500
V_MS/VFW/WVC1, "E:\HD_DVD\xxx\xxx.EVO", track=85
A_AC3, "E:\HD_DVD\xxx\xxx.EVO", timeshift=-1501ms, track=192

[fico99]

tsMuxer can't (I hope YET :)) build multi-title blu-ray/avc-hd. So how you did it? I think this is your problem.

OK, I was also thinking that this problem was caused by the 'user' and not by the software :D

[VisMan]

Oh, stream_type 0x6 can also be used for DTS? That's good to know! I currently have it hardwired to AC3 in my tool... :eek:


So who decides about new stream_type values for new codecs? Is there a central place where one can request assignment of new stream_types?

Thanks!
Setting the stream_type to 0x6 is not enough. You need a descriptor that indicates what type of stream actually is in this PID. For example DVB AC-3 on stream_type 0x6 uses descriptor tag 0x6A (AC-3 Audio Descriptor) for identification.

There is a list of (maybe not all) descriptors here:
http://www.coolstf.com/tsreader/descriptors.html

[madshi]

Setting the stream_type to 0x6 is not enough. You need a descriptor that indicates what type of stream actually is in this PID. For example DVB AC-3 on stream_type 0x6 uses descriptor tag 0x6A (AC-3 Audio Descriptor) for identification.

There is a list of (maybe not all) descriptors here:
http://www.coolstf.com/tsreader/descriptors.html
Thanks.

[drmpeg]

Here's another list:

http://www.tjaekel.de/DVB-SI_descriptors.pdf

As for getting a stream_type assigned, it looks like it would have to be from ISO/IEC, ATSC or SCTE. Since none of those guys use FLAC, I'd have to say you wouldn't get much traction with any request.

Ron

[madshi]

As for getting a stream_type assigned, it looks like it would have to be from ISO/IEC, ATSC or SCTE. Since none of those guys use FLAC, I'd have to say you wouldn't get much traction with any request.
Thanks... :(

[DoomBot]

I was going to demux audio from a movie either the pcm or truehd track, but what encoder is the best to use for truehd and pcm. nero, surcode, libav, or sonic what works best for each audio format?

[Lacix]

Did you have to create the .sup file? if so, how did you output it at 720p? SUPread can currently only output at 1080p and I've been trying to find another program to convert srt subtitles to sup at 720 res.

I've used SupRead and just checked 720p in Options/Image.
The generated .sup file is recognized as 1920x1080 in tsmuxer.
After creating a Blu-ray structure and burning it on a DVD the PS3 plays it with unhideable subtitles.

[DoomBot]

How come i cant demux lpcm to several mono wave files, the option is not highlighted? All of the demux options are not highlighted, somebody help please.

[Nullity]

I've used SupRead and just checked 720p in Options/Image.
The generated .sup file is recognized as 1920x1080 in tsmuxer.
After creating a Blu-ray structure and burning it on a DVD the PS3 plays it with unhideable subtitles.

I cannot get this to work. Have you tried playing the Blu-ray structure on your computer? Have you also tried it by outputting .m2ts instead? I tried both on the PC and cannot get subtitles to show. I tried streaming the .m2ts to the PS3 and no subtitles. I currently do not have a DL-DVD to test but I suspect that it still would not work.

The options I have set in SUPread are:
- Format: Blu-ray
- Rate: 23.976
- Type: Non-drop
- Image: checked PNG and 720p

TsMuxer recognises the .sup file as 1080p, so I figured that was the problem, but you said it does the same on your computer.

I'm stumped. If you try playing the Blu-ray structure or .m2ts file on your PC with a program like Media Player Classic, do the subtitles appear?

Excellent program roman76r, I'm eagerly awaiting the version that has more subtitle support!

[Warrex]

- Image: checked PNG and 720p

Just as you wrote the 720p option comes from the "Image" section and only works for image output not for stream output.

Sadly there is currently no alternative to being patient.

[iSkywalker]

Can anyone help me? I have several mkv files (720p). Video codec is MPEC-4 AVC and audio codec is Dolby AC3. I tried to convert the mkv file to AVCHD disc playable on my PS3. I set the output as "Creat Blu-ray Disk". If I convert 1 file, the AVCHD played perfectly on PS3. However, if I convert 2 files together on 1 dvd, I got nothing shown on PS3, not even an error message!! Can tsMuxeR 1.7.3 support to convert several mkv files on 1 dvd?

[fico99]

Can anyone help me? I have several mkv files (720p). Video codec is MPEC-4 AVC and audio codec is Dolby AC3. I tried to convert the mkv file to AVCHD disc playable on my PS3. I set the output as "Creat Blu-ray Disk". If I convert 1 file, the AVCHD played perfectly on PS3. However, if I convert 2 files together on 1 dvd, I got nothing shown on PS3, not even an error message!! Can tsMuxeR 1.7.3 support to convert several mkv files on 1 dvd?

I've got exactly the same problem on my PS3 when I try that.
tsMuxeR doesn't support multiple video's on a Blu-ray Disk yet.

[Lacix]

I cannot get this to work. Have you tried playing the Blu-ray structure on your computer? Have you also tried it by outputting .m2ts instead?
Ok, mystery solved.
I've made a mistake when reencoding the video to make it 1280x720. I've used the mkv as input and the subtitle was hardcoded into the output video. :o
Which program can be used to work with AVCHD format and add text subtitle ?

[DoomBot]

So does anybody here have an idea why i cant demux lpcm to several mono wav files or to a raw lpcm file, only thing i can do is demux it to a single wav file but thats not what i want. All the demux options for pcm are not highlighted, so is there something i am doing wrong or should have installed? Im lost on this one have no clue.

Please help

[yonta]

So does anybody here have an idea why i cant demux lpcm to several mono wav files or to a raw lpcm file, only thing i can do is demux it to a single wav file but thats not what i want. All the demux options for pcm are not highlighted, so is there something i am doing wrong or should have installed? Im lost on this one have no clue.

Please help

It looks like that the demux options tab for LPCM is a feature preview, planned but not yet implemented.
You can use eac3to to demux mono wave files directly from .m2ts files.

eac3to source.m2ts 2: mono.wavs

Track number depends on the source file.

[DoomBot]

Yes i have tried this but the results are bad they end up having a buzzing noise and you hardly hear the audio at all. Using truehd with eac3to i have no problems encoding to dts but pcm is a no go.

[Audioboxer]

This may be good news for you guys!

I have more good news to report today – the system software update will also add DTS-HD Master Audio output for Blu-ray videos, which means the high-definition visuals of Blu-ray will now be matched with the highest quality audio for the ultimate movie-watching experience on PS3.

DTS-HD Master Audio is literally bit-for-bit identical to the studio master recording and makes movie soundtracks and sound effects truly come to life. The technology delivers audio at the incredibly high rate of 24.5 mega-bits per second (Mbps) on Blu-ray disc, which is significantly higher than standard DVDs. DTS-HD Master Audio also offers 7.1 audio channels at 96k sampling frequency/24 bit depths, so you’ll be totally immersed in the sound. The firmware update will add DTS-HD High Resolution Audio as well, which is a similar output technology that requires less disc space. You can read more about both codecs here.

DTS-HD support in PS3 firmware 2.30

http://blog.us.playstation.com/2008/04/10/firmware-v230-details-and-store-walkthrough/

[DoomBot]

So when might LPCM demuxing features be implemented instead of just demuxing to one wav file, what about the other two options?

[lordvader1982]

Quick question.

For converting my HD-DVD collection, I'm currently using the multistep process as described in the Blu-ray authoring guide
(evodemux -> vc1conv or h264info-> tsMuxer).

Can the current incarnation of tsMuxer replace that multistep process ?

[n0mag!c]

Quick question.

For converting my HD-DVD collection, I'm currently using the multistep process as described in the Blu-ray authoring guide
(evodemux -> vc1conv or h264info-> tsMuxer).

Can the current incarnation of tsMuxer replace that multistep process ?
Yes, with tsMuxer you can convert HD-DVD to Blu-Ray just for one step. I personally don't care about 24p output 'cause my TV can do inverse pulldown and then speedup with interpolated frames.

[Audioboxer]

http://www.smlabs.net/tsMuxer/tsMuxeR_1.7.6(b).zip

I have no idea what's new?

[AmNeSia]

Have been using this great program for a few days now and have run into a slight problem..

I was converting a "joined" .ts file (via TSSpliter) that was roughly 45 minutes long.. but when moved over to the PS3 it only played up to "4 minutes" of the video and showed the length of the file being roughly 1MB (or thereabouts) in length.. when in actual fact it was 4GBs and it played perfectly for the full 45 minutes on the PC.

Is there any way that I can resolve this problem in the future.. such as running it via another program, perhaps .. that resolves the correct 'duration' .. as it sounds like its somehow basing its duration on the first .000 ts that was joined.

[mpiper]

Great program! Any chance we can get the option to output the streams as an EVO? or even build a HD-DVD folder?

All the programs that I can find that write 3X DVD (mini HD-DVD) force the resolution to 1080P, so I'm trying to find a way to generate mini HD-DVDs with a resolution of 1280X720P.

Since this already reads and processes EVO files, I'm hoping writing the same will be easy to impliment.

Thanks!

[jordan4584]

Hi, I've converter audio to AC3 and remuxed to an M2TS. It plays fine on my computer but I can only get sound on my PS3, whats going wrong? Its at level 4.1 as well, also the trailers for the movie work but they were AC3 audio in the first place...

[lexor]

Last time I asked this, it went unanswered, but lets try it one more time.

Regarding the CBR options, how do I pick Bitrate and VBV Buffer size? No matter what I try I get buffer overflows all around. Is there a rule/formula for calculating them?

[drmpeg]

Last time I asked this, it went unanswered, but lets try it one more time.

Regarding the CBR options, how do I pick Bitrate and VBV Buffer size? No matter what I try I get buffer overflows all around. Is there a rule/formula for calculating them?
The TS bitrate must be higher than the combined peak bitrate all the streams in the mux. Usually the audio is CBR, so the video stream bitrate determines the TS rate.

For VBV size, I would think the muxer would determine this from the stream. However, the typical VBV size for MPEG-2 HD is either 9,781,248 bits or 7,995,392 bits for ATSC streams.

For AVC streams, 30,000,000 bits is what's used for Blu-ray.

Ron

[gav1577]

Hi is anyone getting audio but no video since 1.7.3(b) ? :confused:

[lexor]

The TS bitrate must be higher than the combined peak bitrate all the streams in the mux. Usually the audio is CBR, so the video stream bitrate determines the TS rate.

The best I can get is 9500kbps to work on a video with 320kbps (cbr ac3) audio and 2200kbps max video. It generates 1.81Gb file from a ~400mb (vbr m2ts) source... any lower bitrate and it's vbv overlows all over. Perhaps bitrate has to be so high because I'm not setting vbv correctly?


For VBV size, I would think the muxer would determine this from the stream. However, the typical VBV size for MPEG-2 HD is either 9,781,248 bits or 7,995,392 bits for ATSC streams.

tsmuxer asks for vbv in ms, how does one convert bits to millisecond?

[Diodato]

Hi is anyone getting audio but no video since 1.7.3(b) ? :confused:Yes I have the same symptoms, the PS3 will play audio only and no video with newer versions (though the PS3 correctly detects the AVC video type and shows it's current bitrate).

[Threedcoder]

I've got a fairly recent BluRay release that's been decoded.

tsMuxeR is not reporting any audio delay. However, after re-encoding, the audio is definitely delayed.

Anyone know how to get specific audio track delay(s) with respect to the video track? I don't care what application...I just need a correct audio delay (in milliseconds if possible).

Thanks.

[Atak_Snajpera]

xport

[Warrex]

You could try using eac3to (or xport AFAIK). It corrects the delay when demuxing. See here: http://forum.doom9.org/showthread.php?p=1100197#post1100197

example: eac3to Original.m2ts New.mkv
This will give you the video stream remuxed as mkv and the audio tracks as ac3 or flac (for HD Audio Tracks).


example 2: eac3to Original.m2ts -demux
This will give you the demuxed streams without remuxing, etc. anything.

[Threedcoder]

You could try using eac3to (or xport AFAIK). It corrects the delay when demuxing. See here: http://forum.doom9.org/showthread.php?p=1100197#post1100197

example: eac3to Original.m2ts New.mkv
This will give you the video stream remuxed as mkv and the audio tracks as ac3 or flac (for HD Audio Tracks).


example 2: eac3to Original.m2ts -demux
This will give you the demuxed streams without remuxing, etc. anything.

I have already tried eac3to and it produces the same out of sync results.

Granted this is using the TrueHD track, maybe I should try it using the standard DD+/AC3 channel.

Maybe it's something encoded into the disc? I have no idea. However it's definitely interesting that tsmuxer reports no delay and eac3to demuxes and produces the same delay.

I'll take a look at xport and see if it tells me anything different.

Thanks.

[jordan4584]

Yes I have the same symptoms, the PS3 will play audio only and no video with newer versions (though the PS3 correctly detects the AVC video type and shows it's current bitrate).

Yep, I have the same problem.

[Glorioso]

Can i use tsmuxer to add subtitles to a existing project?

[Threedcoder]

I have already tried eac3to and it produces the same out of sync results.

Granted this is using the TrueHD track, maybe I should try it using the standard DD+/AC3 channel.

Maybe it's something encoded into the disc? I have no idea. However it's definitely interesting that tsmuxer reports no delay and eac3to demuxes and produces the same delay.

I'll take a look at xport and see if it tells me anything different.

Thanks.

Even the DD+/AC3 track demuxed by eac3to has the same delay (I just tried it).

In this case it's actually an audio delay which means the video is starting before the audio, so in order to correct it, either the audio tack would need to be chopped off in the front or a delay would need to be added to the video track.

At this point, the only way I can correct this problem is with eac3to and "eyeballing" the delay. But what good is that really? More like a pain in the ass.

I've only seen one other movie that has things setup this way and it was an HD-DVD, and EVODemux reported the delay correctly.

[S3Ri0US]

I cant open the m2ts file from Gone.baby.gone... TsMuxer tell me that the file is undetect... with EAC3TO i have no Problems... can you check this PLZ Roman..

[Atak_Snajpera]

Roman is not a magician! You should provide sample!

[Joniii]

Roman.

There seems to be something wrong with .ts and m2ts files that TSMuxer makes. Some players won't play these files at all. For example:

I ripped The Rock Blu-ray.

1. If I play those .m2ts files, they'll play fine on any player.

2. If I load that .m2ts into TSMuxer I can deselect subtitles and audio tracks I don't need and then save as .ts or .m2ts, again plays fine on all players.

3. If I demux that original .m2ts with tsremux or tsmuxer then load elementary streams into TSMuxer, and then save either .ts or .m2ts, now these won't play on all players.

Only thing I can think of is that TSMuxer doesn't make compatible files.
I can add samples into my ftp if needed.

[wakebrder]

Thanks for all your great work on this program!

I'm having a problem with True-HD. If I strip everything but the video and True-HD track, the resulting file will not play with Power DVD . If I downconvert True-HD to AC3, the resulting file plays fine.

This might be a minor inconvieniece to some, but my Panasonic DMP-BD30 and Denon 2808CI both support the new HD audio codecs, so that's what I want on my backups.

Any thoughts?

Edit: I installed Nero 8, and showtime will play the True-HD clip with no audio. I'm only running analog audio on this PC, but shouldn't Power DVD down convert True-HD?


I'll try a small clip and see if my BD30 will play it.

Edit:True-HD clip plays choppy video with no sound on the BD30. I guess I'll just down convert to AC3 until this is fixed.

[roman76r]

Version 1.7.6(b) (http://www.smlabs.net/tsMuxer/tsMuxeR_1.7.6(b).zip)
- Ability to open Blu-ray playlist (MPLS) files added. Also, when MPLS file is opened, chapters list automatically imported.
When MPLS is processed, "Clean Break" for connection_condition=5 correctly processed. It is actually for large playlists (10 M2TS files and more).
- bug fixed: some H.264 streams in version 1.7.1/2/3 did not work in PS3. It is the same problem it was corrected in version 1.7.3. Fixed again.
- bug fixed: Issue with muxing PGS stream from several source files (i.e. append mode) fixed.

[hm10]

Version 1.7.6(b) (http://www.smlabs.net/tsMuxer/tsMuxeR_1.7.6(b).zip)
- Ability to open Blu-ray playlist (MPLS) files added. Also, when MPLS file is opened, chapters list automatically imported.
When MPLS is processed, "Clean Break" for connection_condition=5 correctly processed. It is actually for large playlists (10 M2TS files and more).
- bug fixed: some H.264 streams in version 1.7.1/2/3 did not work in PS3. It is the same problem it was corrected in version 1.7.3. Fixed again.
- bug fixed: Issue with muxing PGS stream from several source files (i.e. append mode) fixed.


what with srt import?