Pintu Posted January 27, 2014 Share Posted January 27, 2014 I've read through all (?) AAC-HE and libfaad2 Wrapper Topics on this forum, but I'm still unable to find a definite answer how to achieve Surround sound with Freeview HD via DVB-T2 in the UK. The latest stage of my trials is to enable the ffdshow audio postprocessor plugin and activate AAC to AC3 encoding, which I believe *should* work. But my receiver (connected via S/PDIF) only receives a stereo signal. I've also installed and tried the libfaad2 Wrapper with the same results. What am I doing wrong? Quote Link to comment
Derrick Posted January 27, 2014 Share Posted January 27, 2014 But my receiver (connected via S/PDIF) only receives a stereo signal. Who says that AAC has to have more than 2 channels? Quote Link to comment
Pintu Posted January 27, 2014 Author Share Posted January 27, 2014 Who says that AAC has to have more than 2 channels? Not all Freeview HD shows are broadcasted with 6 channels, but most primetime shows are. Sherlock on BBC, Superbowl on Channel 4 etc. Quote Link to comment
Derrick Posted January 27, 2014 Share Posted January 27, 2014 Well, I can't get UK Freeview HD via DVB-T2. But I can receive the backup mux via sat at 27,5W. The audio tracks of the HD channels are AAC encoded, but I've never seen more than a stero signal. You can check it with TransEdit. Quote Link to comment
Pintu Posted January 27, 2014 Author Share Posted January 27, 2014 Well, I can't get UK Freeview HD via DVB-T2. But I can receive the backup mux via sat at 27,5W. The audio tracks of the HD channels are AAC encoded, but I've never seen more than a stero signal. You can check it with TransEdit. Strictly come dancing and other shows are also broadcasted in multichannel on Freesat HD and Freeview HD. This is another example of multichannel. It definitely exists. Quote Link to comment
Derrick Posted January 27, 2014 Share Posted January 27, 2014 Is this a guide for DVB-T2 in particular? Anyway, it's very easy to verify. Make a recording of such a show and check the format with e.g. mediainfo or use transedit or go to -> view -> filters -> dvbsource and check the audio format. Quote Link to comment
Pintu Posted February 3, 2014 Author Share Posted February 3, 2014 Is this a guide for DVB-T2 in particular? Anyway, it's very easy to verify. Make a recording of such a show and check the format with e.g. mediainfo or use transedit or go to -> view -> filters -> dvbsource and check the audio format. Alright, there seems to be a lot of conflicting information on Freeview HD and surround sound. After one week I have not found a single programme that was broadcast with multichannel sound, all were stereo. On the positive side, I was able to get AC3 encoding with the ffdshow postprocessor plugin by simply changing to an HDMI connection (instead of SPDIF before). Quote Link to comment
SimonP Posted February 6, 2014 Share Posted February 6, 2014 (edited) I only have FreeSat HD, not Freeview HD but I imagine it's the same and anyway, I just looked through the listings for the forthcoming week and was surprised to see that yes, everything is stereo only. I then looked through some old recordings and found 'Robbie Williams Electric Proms' which is a full concert in 5.1 recorded from the BBC so it does happen, they probably only use it for concerts and maybe sports as I think the Olympics were in 5.1 too. Edited February 6, 2014 by SimonP Quote Link to comment
Derrick Posted February 6, 2014 Share Posted February 6, 2014 ..which is a full concert in 5.1 recorded from the BBC so it does happen.. ..recorded from DVB-T2 or from satellite? Quote Link to comment
Pintu Posted February 6, 2014 Author Share Posted February 6, 2014 I only have FreeSat HD, not Freeview HD but I imagine it's the same and anyway, I just looked through the listings for the forthcoming week and was surprised to see that yes, everything is stereo only. As far as I know Freesat HD sends Dolby Digital, Freeview HD sends AAC (hence my question how to convert AAC to DD). Quote Link to comment
Derrick Posted February 6, 2014 Share Posted February 6, 2014 What is the use to convert 2-channel AAC to DD?? Quote Link to comment
Pintu Posted February 6, 2014 Author Share Posted February 6, 2014 What is the use to convert 2-channel AAC to DD?? Zero. I was under the false impression that Freeview HD sends lots of stuff in multichannel. As no receiver can decode AAC and SPDIF cannot send 5.1 PCM I asked about how to convert AAC in DVBViewer. I've answered that myself, by simply using HDMI over SPDIF. Now all I need is a Freeview HD multichannel programme... Quote Link to comment
Derrick Posted February 6, 2014 Share Posted February 6, 2014 Get freesat, then you can enjoy DD 5.1 Quote Link to comment
SimonP Posted February 6, 2014 Share Posted February 6, 2014 ..recorded from DVB-T2 or from satellite? It was from S2. Does T2 really not support surround sound? I'm amazed! Quote Link to comment
Pintu Posted February 6, 2014 Author Share Posted February 6, 2014 It was from S2. Does T2 really not support surround sound? I'm amazed! Technically it does, with AAC-HE, hence the requirement to decode before sending it to the receiver. But all discussion or testing is futile as there appears to be no programme broadcasted in surround at the moment. See: http://www.bbc.co.uk/blogs/bbcinternet/2010/06/questions_around_surround_soun.html Quote Link to comment
Derrick Posted February 13, 2014 Share Posted February 13, 2014 Technically it does, with AAC-HE, hence the requirement to decode before sending it to the receiver. But all discussion or testing is futile as there appears to be no programme broadcasted in surround at the moment. See: http://www.bbc.co.uk/blogs/bbcinternet/2010/06/questions_around_surround_soun.html Hmm, maybe I was wrong. Though I can't get Freeview I can receive BBC-SATBACK on 11495V at 27,5W. BBC Two HD had 5.1 AAC audio during Winter Olympic coverage. General ID : 6 (0x6) Complete name : C:\TSRecordings\BBC Two HD 02-13 11-44-01.ts Format : MPEG-TS File size : 30.7 MiB Duration : 35s 886ms Overall bit rate mode : Variable Overall bit rate : 7 181 Kbps Video ID : 6101 (0x17D5) Menu ID : 1 (0x1) Format : AVC Format/Info : Advanced Video Codec Format profile : High@L4.0 Format settings, CABAC : Yes Format settings, ReFrames : 4 frames Format settings, GOP : M=8, N=24 Codec ID : 27 Duration : 35s 560ms Width : 1 920 pixels Height : 1 080 pixels Display aspect ratio : 16:9 Frame rate : 25.000 fps Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : MBAFF Scan order : Top Field First Language : English Color primaries : BT.709 Transfer characteristics : BT.709 Matrix coefficients : BT.709 Audio ID : 6102 (0x17D6) Menu ID : 1 (0x1) Format : AAC Format/Info : Advanced Audio Codec Format profile : LC Muxing mode : LATM Codec ID : 17 Duration : 36s 74ms Bit rate mode : Variable Channel(s) : 6 channels Channel positions : Front: L C R, Side: L R, LFE Sampling rate : 48.0 KHz Compression mode : Lossy Delay relative to video : -771ms Language : English Quote Link to comment
Derrick Posted February 13, 2014 Share Posted February 13, 2014 ..same is true for BBC One HD Quote Link to comment
Pintu Posted February 13, 2014 Author Share Posted February 13, 2014 (edited) I think we are confusing ourselves with Freesat and Freeview. In summary: - Freesat HD: 5.1 technically available and shows broadcasted in 5.1 - Freeview HD: 5.1 technically available (see BBC blog), but apparently now shows being broadcasted in 5.1 at the moment. Edit: Oh wait! The most exciting of Sports IS broadcasted in 5.1 on Freeview HD! Edited February 13, 2014 by Pintu Quote Link to comment
Derrick Posted February 13, 2014 Share Posted February 13, 2014 ..no, I'm not confusing Freesat and Freeview. BBC SATBack is the satellite backup for the terrestrial DVB-T2 Freeview network. Of course it's possible that the real Freeview transmissions are still 2-channel stereo. Freesat HD: AC3 Freeview HD: AAC Quote Link to comment
Pintu Posted February 13, 2014 Author Share Posted February 13, 2014 Okay, now as I've finally found a source, the answer is: 1) Use libfaad2 wrapper or LAV Audio as AAC Filter (not Microsoft) 2) Change Windows Audio Settings to 5.1 or higher or Use ffdshow audio postprocessing to decode to ac3 and bitstream as Dolby Digital. Hurray. Quote Link to comment
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