Directshow Filter for AAC audio in NZ TS files?

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183 posts

Master Geek

#165360 18-Sep-2008 15:06

wtf 14s? where did all the extra space come from? At least the audio wasnt stretched. What results do you get if muxing audio back as lc-aac or mpa/mp2?

lchiu7

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#165403 18-Sep-2008 16:25

Did another test. This time (recorded The Punisher from TV2 I think) and it's 43s! But it's consistent so once I fiddle around a bit I can get audio and video in sync

Haven't tried AAC-LE audio yet.

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charley

183 posts

Master Geek

#165685 19-Sep-2008 17:21

Man your getting some out of it results lol. At least it's fixable.

Do you know how to contact the author of "Haali Media Splitter" so we can request support for he-aac?

lchiu7

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#165832 20-Sep-2008 16:25

Mea Culpa

I found out that when I was converting the wav file to AC-3, the Besweet had an audio delay set it in it! So that delay passed onto the muxed file. Turning that off and now it seems that the conversion works okay.

No idea who the author of Haali splitter is - why does it need to change to handle AAC-HE files? All it does I think is take a .ts file and split it into two components for the application to handle. I think gbpvr uses it and so do a few other programs. It seems to work fine.

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charley

183 posts

Master Geek

#165833 20-Sep-2008 16:37

I copied this info from ms website.

Filters can be grouped into several broad categories:
A source filter introduces data into the graph. The data might come from a file, a network, a camera, or anywhere else. Each source filter handles a different type of data source.
A transform filter takes an input stream, processes the data, and creates an output stream. Encoders and decoders are examples of transform filters.
Renderer filters sit at the end of the chain. They receive data and present it to the user. For example, a video renderer draws video frames on the display; an audio renderer sends audio data to the sound card; and a file-writer filter writes data to a file.
A splitter filter splits an input stream into two or more outputs, typically parsing the input stream along the way. For example, the AVI Splitter parses a byte stream into separate video and audio streams.
A mux filter takes multiple inputs and combines them into a single stream. For example, the AVI Mux performs the inverse operation of the AVI Splitter. It takes audio and video streams and produces an AVI-formatted byte stream.
The distinctions between these categories are not absolute. For example, the ASF Reader filter acts as both a source filter and a splitter filter.

If we dont have a splitter that supports our he-aac audio and can pass it onto a decoder then we wont have audio or correct audio in directshow.

There's also the HDTVPump plugin that supports h.264 streams, aac and can split it for directshow filters but unfortunately it doesnt support our audio either.

lchiu7

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#165845 20-Sep-2008 17:48

charley: I copied this info from ms website.

Filters can be grouped into several broad categories:
A source filter introduces data into the graph. The data might come from a file, a network, a camera, or anywhere else. Each source filter handles a different type of data source.
A transform filter takes an input stream, processes the data, and creates an output stream. Encoders and decoders are examples of transform filters.
Renderer filters sit at the end of the chain. They receive data and present it to the user. For example, a video renderer draws video frames on the display; an audio renderer sends audio data to the sound card; and a file-writer filter writes data to a file.
A splitter filter splits an input stream into two or more outputs, typically parsing the input stream along the way. For example, the AVI Splitter parses a byte stream into separate video and audio streams.
A mux filter takes multiple inputs and combines them into a single stream. For example, the AVI Mux performs the inverse operation of the AVI Splitter. It takes audio and video streams and produces an AVI-formatted byte stream.
The distinctions between these categories are not absolute. For example, the ASF Reader filter acts as both a source filter and a splitter filter.

If we dont have a splitter that supports our he-aac audio and can pass it onto a decoder then we wont have audio or correct audio in directshow.

There's also the HDTVPump plugin that supports h.264 streams, aac and can split it for directshow filters but unfortunately it doesnt support our audio either.

Well clearly sub has a filter that works in gbpvr since he is able to split the ts streams, take the audio stream and pass it to the Monogram AAC-HE codec so gbpvr can play it. Maybe he could be persuaded to deliver that separately?

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charley

183 posts

Master Geek

#165855 20-Sep-2008 18:42

hmm wonder how much work it would take for him?

I wouldnt mind donating.

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sub

358 posts

Ultimate Geek

#165906 21-Sep-2008 05:19

lchiu7:
Well clearly sub has a filter that works in gbpvr since he is able to split the ts streams, take the audio stream and pass it to the Monogram AAC-HE codec so gbpvr can play it. Maybe he could be persuaded to deliver that separately?

Sorry, I wont be delivering it separately. It is part of GB-PVR.

lchiu7

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#165908 21-Sep-2008 07:04

Check out

haali list

Aware of the issue - no progress it seems so far.

I am guessing that with the haali splitter being able to handle our audio, you could do all the processing in VirtualDub or avisynth without having to revert to applications like mplayer and winamp to process the audio. So batch it all up.

Staying in Wellington. Check out my AirBnB in the Wellington CBD. https://www.airbnb.co.nz/h/wellycbd PM me and mention GZ to get a 15% discount and no AirBnB charges.

charley

183 posts

Master Geek

#166080 21-Sep-2008 19:41

Yes it would save us alot of time.

medp7060

14 posts

Geek

#166565 23-Sep-2008 17:17

I am also trying hard to get AAC+ audio recognised, but with no success. AAC LATM/LOAS format is really not popolar at all. No idea why NZ chose it.

charley

183 posts

Master Geek

#166567 23-Sep-2008 17:27

It was an interesting choice. I think he-aac produces smaller files while maintaining quality resulting in less bandwidth. Mayb that's why?

sbiddle

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#166573 23-Sep-2008 17:36

medp7060: I am also trying hard to get AAC+ audio recognised, but with no success. AAC LATM/LOAS format is really not popolar at all. No idea why NZ chose it.

It has become the new recommended audio format for new DVB-T deployments and for DVB-T2. it wasn't a case of NZ going off and doing their own thing, NZ was simply following the standards.

charley

183 posts

Master Geek

#166578 23-Sep-2008 17:46

Do you know why it has become the standard?

lchiu7

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#166585 23-Sep-2008 18:08

charley: Do you know why it has become the standard?

Perhaps ask the engineers at Kordia who apparently had input into the decision. No worries about AAC audio - seems like an efficient codec. It's the other bits that cause us the problem. Plus I am not sure there is a multichannel version of AAC standardised so DD 5.1 is the standard there and for many folks, part of the attraction of HD is 5.1 surround sound. Hard to get too excited about HD when you are going from say 576p to 720p but staying with stereo sound.

Staying in Wellington. Check out my AirBnB in the Wellington CBD. https://www.airbnb.co.nz/h/wellycbd PM me and mention GZ to get a 15% discount and no AirBnB charges.

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