View Full Version : no audio
October 9th, 2004, 03:51 AM
I am trying to edit some files, but I get no audio whatsoever. The files are MPEG2 program streams extracted from HDTV transport streams captured with the hardware HDTV card MyHD. The program streams were extracted from the transport stream by HDTV2MPEG. These are 720p video feeds, with 5.1 AC3 audio.
When I load these files in videoredo, the video looks great, and the editing works fine, but I get absolutely no audio. All the codecs needed to read those files in other players are registered and configured as they should be (in graphedit the mpeg is demuxed by elecard, then the video is sent to nero video decoder and the VMR9, and the audio is sent to my intervideo audio decoder configured for spdif and the audio renderer.
I get no audio while I edit the file, and no audio in the edited file (this time confirmed by other players). If I check the original file's information in videoredo, there is nothing reported in the audio boxes...
I have tried virtually every combination of the audio paths I could think of on my sound card, and in the codecs used by the various players. What am I missing?
thanks for your help
PS the audio works fine with VOB files from ripped dvds for example.
October 9th, 2004, 06:52 AM
We are working on that exact issue right now. You might try the following:
1) Download and install the latest beta from our ftp site:
2) This beta has a new option on the Tools>Options>General page to select the appropriate AC3 stream. You might have to use the raw private stream.
3) If this doesn't work, please upload a 10-20MB clip (use Tools>Trim to create it), to our ftp site: ftp://videoredo:firstname.lastname@example.org/uploads/ and we will make sure that VideoReDo can find the AC3 stream.
FYI, all codecs used by VideoReDo are built in. We don't rely on any previously installed ones.
October 9th, 2004, 03:32 PM
good to hear that this is not specific to my setup :) I'll download the beta right away and I'll let you know. As for the codecs, I wasn't sure you used your own, so it was certainly worth fiddling with the others.
thanks for your quick help.
October 9th, 2004, 09:40 PM
I tried the 279 version, and although I find the ac3 selection menu, it does not seem to find the stream (at least I hear no audio). I am trying to upload something, but I can't seem to copy anything on the ftp server, just read...any thought?
October 9th, 2004, 10:13 PM
Did you click on this link to get to the FTP server? ftp://videoredo:email@example.com/uploads/ If you clicked on the "beta" link then it be read only for you.
October 10th, 2004, 02:20 AM
I was trying to upload from a mac, perhaps that made a difference. I started an upload from a PC earlier (my PC is not connected right now), and I think it went through. The mpeg file is in the "julien" directory. It's a cut from the original ts stream made with HDTVtoMPEG2. I think that when I cut with quickedit, the audio ends up missing for real in the resulting file. Let me know if you can "locate" the Ac3 stream.
October 10th, 2004, 06:45 AM
There is a problem in the format of the AC3 stream multiplexing. Perhaps there's an issue with: HDTV2MPEG. I couldn't get the audio to play properly on any software player.
We are going to be adding transport stream support this week. Would you mind uploading a similar sized clip of the original TS stream? BTW, how did you capture this?
October 10th, 2004, 02:25 PM
the audio in the file I sent you plays fine on my computer in any player. As I said it uses the graph I mentioned earlier, but the audio comes out nicely in DD to my receiver by the SPDIF output. It's still very odd that you can't find the ac3 stream either. I'll post on the HDTVtoMPEg2 forum to see if anyone has a clue. I will also upload a ts stream tomorrow. The ts streams are captured with MIT MyHD MDP-120 hardware HD encoder/decoder. Looking forward to the direct ts support. If you can, make it easy to select the different PID/ps streams :)
October 10th, 2004, 02:46 PM
just so you know, the elecard demultiplexer I use displays the following for this file:
INPUT Major type: stream, Subtype: MPEG2_PROGRAM, Format: GUID_NULL
AC3 OUTPUT ID 189@Prog#0 Major Type: AUDIO, SUBTYPE: DOLBY_AC3, Format: WaveFormatEx: 48000KHz 0Bit Stereo
October 10th, 2004, 04:36 PM
I found the AC3 stream, its just that some of the settings in the stream are incorrect. I'm pretty sure thats the case since all other AC3 streams play OK both in VRD and in other software players.
Technically, what's wrong is the "offset to the first ACC" unit is off by one byte. Any chance they have a later version that addresses this?
I could pretty easily fix VideoReDo to accept this stream, but I'd rather just support transport streams and skip the HDTV2MPEG step. And yes, you'll see a list of video programs and be able to swap between them pretty easily.
October 24th, 2004, 08:00 PM
Hi, I just downloaded the trial and am quite impressed! I've been looking for a good (quick, clean, easy reliable) way to edit shows I capture for a long, long time.
However, I'm having the same problems as the original poster... I've tried HDTV2MPEG2 (several versions), TSReader, ProjectX, and PVAStrumento to convert my transport stream to a program stream to feed VideoReDo, and it never finds the AC3. I've been practicing on a 1280x720p 2.0 AC3 .TS file (from a HiPix card).
So, I guess this post is just a "Come on transport stream support!" :)
Alternatively... if anyone else has found a transport->program stream converter that works, please let me know!
October 24th, 2004, 09:55 PM
How about uploading a 20 MB clip each of the TS and your PS? Our FTP site is: ftp://videoredo:firstname.lastname@example.org/uploads/ If you do upload, please send an email or leave a msg here.
The first version of TS support will be out in a few days. Its working here in the lab, but turns out there's a lot of housekeeping work to do to fold it into the batch processing.
October 25th, 2004, 11:37 AM
I uploaded a transport stream, and the program stream output by HDTVtoMPEG2 v1.10.6 in uploads/Rythan as you requested (I had HDTVtoMPEG2 extract PIDs 0x11 and 0x14, the main program streams). The MPG file plays in PowerDVD with audio, but as before, VideoReDo has no audio.
Thanks for taking a look!
October 25th, 2004, 02:11 PM
Thanks very much for the files. Here's the story. The HDTVtoMPEG2 file has an incorrect calculation in what's called the "first offset to aau". Its value is 2 when it should be 1. That fact that PowerDVD plays it speaks more to PowerDVD's ability to find the stream than anything else. I know that VideoReDo is correct since it correctly processes the AC3 streams from commerical DVDs which use a similar stream packing logic. If HDTVtoMPEG2 has tech support, then you should probably let someone there know.
Now for the good news, our transport stream logic processes the .ts file just fine. In fact, there are 3 programs in this .ts file and we can select which one we want to view. Saving the file creates a perfect MPEG2 program stream of the selected program.
What kind of signal does the HPIX card capture? Which provider?
October 25th, 2004, 10:31 PM
Hi, thanks for the quick reply, and you're very welcome for the files.
HDTVtoMPEG2 is freeware. I'm not certain of who is maintaining it now, but the source is available for 1.0.7 and 1.10.3, so I may poke around and see if I can find the bug. It is good news that your code is working on the transport streams, the fewer tools necessary to get usable video out the better!
My Hipix card captures OTA ATSC HDTV. The little clip I sent you was from WTVD (ABC) in Durham, NC. If you'd like clips from other broadcasters, just let me know. I get 5 or 6 stations in my area.
October 26th, 2004, 06:53 AM
I would appreciate some longer clips. Any chance you could put them on a DVD or CD (as data) and just mail it to me? If so, I'll forward our address via private mail.
Also, that very short clip you uploaded to me had 3 different programs on it. One of the features of transport streams is the ability to multiplex multiple programs into a single stream. (Technical note, Program streams can do that as well, but its much more difficult to do ).
October 26th, 2004, 07:08 AM
Sure, send me your address and I'll send you a DVD. A minute of HDTV is about 130MB, so I could send you about 10 minutes of 3 different stations, or 5 minutes of 6 stations, etc. Just let me know what you want. I'll capture data when real HDTV broadcasts are on.
It's very typical for there to be 2-4 subchannels per station (transport stream). It's usually the broadcast in HDTV, the broadcast in SDTV, and then some kind of 24 hour news/weather, but sometimes it's a bit more interesting (such as a few different games that are being played at the same time).
October 26th, 2004, 07:34 AM
Thanks, please check your private inbox on this msg board.
Doesn't really matter what to send as long as there are multiple programs in the TS. Want to test the stream switching abilities in VRD.
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