allanlee Posted July 26, 2019 Share Posted July 26, 2019 Last year there was UHD channels (namely CCTV4K) started broadcasting in AVS2 codec (ref). I understand that there has been some discussions about AVS+ support before but it ended with some unpleasant issues. However AVS2 is a brand-new open-souce codec, with similar compression efficiency as HEVC, mainly used by broadcasters in China. Existing code examples could be found here: Encoder xavs2 and decoder davs2. There is not much available documents in English, I only found this one. However if necessay I may be able to help translate. Attached are UHD and FHD ts samples, as well as a transponder dump from 125.0E 3970 H 15950 8PSK. Hope support of AVS2 could be added to TransEdit and DMS (to recognize and correctly label the video stream); and if possible - HTTP/RTSP live streaming with DMS? As far as I know there no DirectShow decoder at this moment, only hardware-based decoder (HiSillicon Hi3798MV310 based players) could play m3u inputs. Thank you very much in advance! Quote Link to comment
Griga Posted July 26, 2019 Share Posted July 26, 2019 4 hours ago, allanlee said: Attached are UHD and FHD ts samples, as well as a transponder dump from 125.0E 3970 H 15950 8PSK. I can't download from this hoster. Firefox shows nothing at all,.Chrome shows the page and translates parts of it to German, but clicking "common download" prompts me to create an account for some chat facility, which i will not do, of course. Please choose a hoster whose page I can read (I will not click on something that I don't understand) and that does not try to push me to something in such an obtrusive way. The TransEdit Analyzer is already able to detect AVS. However, there is still no way to read the video headers, due to te lack of suitable specifications, and no way to play this video format due to the lack of a suitable DirectShow decoder. So the only thing that could be done with some efforts is to let the DMS send a (untranscoded) live stream to a client that knows how to handle it (not DVBViewer). I doubt that it is worth the hassle, though. Quote Link to comment
allanlee Posted July 26, 2019 Author Share Posted July 26, 2019 1 hour ago, Griga said: I can't download from this hoster. My apologize, here they are. https://drive.google.com/open?id=1qNYthdrvyl2TKvrgV9fS6KN38x99agFb Do let me know if there's still difficulty downloading the samples. If it's too troublesome to implement the streaming in DMS, will it be possible to get it done in TransEdit Analyzer? Sorry again for the inconvenience caused by the file hosting. 1 Quote Link to comment
Griga Posted July 26, 2019 Share Posted July 26, 2019 2 minutes ago, allanlee said: will it be possible to get it done in TransEdit Analyzer? It's already done. You can stream any selection of PIDs, regardless of the content and whether it is identified or not. Do you have a client that is able to play a TS containing AVS? TransEdit is not able to detect AVS in your samples because the stream type in the PMT is different compared to the AsiaSat sample that I got in 2013. They used 0x42, now it's 0xD2. It's from the range of stream types that is supposed to be used for private (proprietary) purpose. However, here someone mentions the usage for AVS2. It would be good to have a list of consistent stream type values that have been defined for AVS up to now. The usage of random values by broadcasters/developers because they are not specified clearly would make it very difficult for TransEdit. Quote Link to comment
allanlee Posted July 26, 2019 Author Share Posted July 26, 2019 5 minutes ago, Griga said: Do you have a client that is able to play a TS containing AVS? Yes but not now - I have ordered a Hi3798MV310 based player which should be capable to decode both AVS+ and AVS2 video, as well as DRA audio, expected to recive it in... maybe 4-5 weeks. AVS+ and AVS2 are 2 different encodings, just like H264 and HEVC, so it's not surprising to have another stream type indicator. I tried to find specification documents but didn't manage to make any progress so far. A more pratical way -- in my view -- would be to check through available samples, most terrestrial broadcastings (DTMB) in China use AVS+ and DRA for HDTV and AVS for SD; and most HDTV channels in 125C and 115.5C (ChinaSat 6A/6B) use AVS+ and AC3. If it helps, I can dump some samples for you to verify if they're using the same stream type indicator. A side question - will it be possible for DMS to record and stream the channels with AVS+ & DRA? Quote Link to comment
allanlee Posted July 26, 2019 Author Share Posted July 26, 2019 1 hour ago, Griga said: It would be good to have a list of consistent stream type values that have been defined for AVS up to now. http://www.nrta.gov.cn/module/download/downfile.jsp?classid=0&filename=1603081724377941327.pdf Page 5 mentioned that AVS+ 0x42 Quote Link to comment
Griga Posted July 27, 2019 Share Posted July 27, 2019 I've used one the samples and made it a source for live simulation, so that DVBViewer assumes the input is a channel. After some changes in the code I managed to play the stuff (AC3 audio only) and to record it (video and audio). Hence recording will be possible with the DVBViewer Media Server. Streaming of the original TS will also work, I guess. However, transcoded streaming (e.g. with WebM or HLS as target format for playback in the browser) will require a ffmpeg.exe that supports AVS as input. DRA Audio is another chapter. Never heard of it before. Samples are required. Quote Link to comment
lastcameleon Posted July 27, 2019 Share Posted July 27, 2019 (edited) https://github.com/tianyigeng/DRA-Audio-System RTP Payload Format for DRA Audio: https://tools.ietf.org/html/draft-xu-avt-dra-00 According to this page (Or what I can see of it) : https://wenku.baidu.com/view/0733a4ef19e8b8f67c1cb9bc.html descriptor_tag = 0x05, descriptor_length = 0x04, format_identifier = 0x44524131 ('DRA1') Edited July 27, 2019 by lastcameleon Quote Link to comment
Griga Posted July 27, 2019 Share Posted July 27, 2019 The last link seems to provide some information about how DRA audio is encapsulated in a TS. That's what we need. Nevertheless samples are required so I can see how it looks like in practice. If the Chinese way of using AVS and DRA for TV/Radio is supposed to become an international standard and to be supported by a wide variety of software, specifications should be published in English. I haven't seen it up to now. Maybe the Chinese government rather wants people to use Chinese software... Quote Link to comment
allanlee Posted July 27, 2019 Author Share Posted July 27, 2019 16 minutes ago, Griga said: Nevertheless samples are required so I can see how it looks like in practice. Just a moment, I set up a DTMB device and Terrestrial anntena to get a sample for you. 17 minutes ago, Griga said: specifications should be published in English Will have to request here (as a company - maybe DVBViewer qualifies?): http://www.avs.org.cn/english/EnglishSpec.asp 22 minutes ago, Griga said: Maybe the Chinese government rather wants people to use Chinese software... Actually... most people use DVBViewer as PC software afaik. In contrast, the broadcasters always promotes their STB or other customized hardware players / boxes, whose picture quality are in general not as good. Quote Link to comment
allanlee Posted July 27, 2019 Author Share Posted July 27, 2019 Took me much more time than expected to settle the hardware & signal... Here comes the samples. https://drive.google.com/open?id=1waSEcqLwl9vx5w75RS3ef0_wAN-juqb8 Quote Link to comment
Griga Posted July 28, 2019 Share Posted July 28, 2019 Thanks for your efforts. Recording and (untranscoded) streaming of a TS containing AVS video and DRA audio is working now, and you can get TransEdit & DVBViewer & DMS test versions, if needed. I will post more details as soon as I find time for it. Quote Link to comment
Griga Posted July 29, 2019 Share Posted July 29, 2019 Here is a more detailed list of what will work: The TransEdit Analyzer detects AVS+ / AVS2 video and DRA audio in the PMT. The same applies to the TransEdit scanner and the DVBViewer scanner. New video/audio format values for AVS video / DRA audio have been introduced in TransEdit, DVBViewer Pro and the DMS, so that they can be stored in scan results and channel lists. DVBViewer and DMS are able to record a TS containing AVS video / DRA audio, as well as pure DRA audio as .dra file in case of radio or TV with the "audio only" recorder setting. However, due to lack of information about the DRA frame headers .dra files will only start in a "clean" way if the DRA frames are aligned with the PES packets. DVBViewer as network client is able to receive HTTP and RTSP (Sat>IP) streams containing AVS video and/or DRA audio. The DMS is able to stream an original TS containing AVS video and/or DRA audio via HTTP and RTSP (Sat>IP). The following things won't work: Playback of AVS video / DRA audio in TransEdit and DVBViewer, mainly due to the lack of suitable DirectShow decoders and missing knowledge about how format details can be retrieved from the video/audio headers (video resolution, aspect ratio, audio sample rate etc.). Complete AVS video/DRA audio header information by the TransEdit Analyzer -> Header Info function. Reason see above. Transcoded streaming with DMS (particularly for playback in the browser) and transcoding recordings to other video/audio formats because FFmpeg.exe doesn't accept AVS video / DRA Audio input. Including files with another container format than TS in the DMS media database, if the file contains AVS video, because MediaInfo.dll doesn't recognize it. Regarding the fact that AVS was already introduced 14 years ago it is a quite poor result that the format is still unsupported by popular open source software like MediaInfo, FFmpeg, LAV Filters and VLC. VLC is at least able to detect AVS video (it is displayed in the Codec information), but the picture remains black. So I guess there is either AVS promotion missing (or specifications readable by Non-Chinese developers or code contributions by Chinese developers), or it is unwanted. At least there is a book that contains a description of the DRA bitstream format (see here), but Google Books only provides parts of it. Particularly the frame header description ist missing. Quote Link to comment
allanlee Posted July 29, 2019 Author Share Posted July 29, 2019 Thank you very much for the great efforts! I'll be more than happy to help test out with the "real life" networks, if necessary. Quote Link to comment
allanlee Posted September 4, 2019 Author Share Posted September 4, 2019 Tested with DMS 2.1.5.1, everything works as expected. A big thank you to the great work! Quote Link to comment
love727 Posted September 8, 2019 Share Posted September 8, 2019 (edited) Thanks very much！！！ Edited September 8, 2019 by love727 Quote Link to comment
allanlee Posted September 15, 2020 Author Share Posted September 15, 2020 Wondering if it's possible to do the similar for AVS3? Sample ts here: https://drive.google.com/file/d/1c4KIdgVBDGrPFA0NBXrSExiJyV7eUaJy/view?usp=sharing An open source project might be helpful: https://gitee.com/zhengtianbo/FFmpeg-avs2-avs3/releases As always, thank you very much in advance! Quote Link to comment
Griga Posted September 16, 2020 Share Posted September 16, 2020 Done. It will be available in the next releases. It's easy as long as DVBViewer doesn't have to play it. It just required recognizing the additional stream type value 0xD4 in the PMT as AVS. Quote Link to comment
allanlee Posted September 17, 2020 Author Share Posted September 17, 2020 On 9/16/2020 at 2:08 PM, Griga said: Done. It will be available in the next releases. It's easy as long as DVBViewer doesn't have to play it. It just required recognizing the additional stream type value 0xD4 in the PMT as AVS. Many thanks. Streaming & recording is sufficient, at least in my case. Quote Link to comment
love727 Posted October 11, 2020 Share Posted October 11, 2020 Please update support for avs3, stream type = 0xd4 Sample address: https://github.com/uavs3/avs3stream/tree/master/TS Quote Link to comment
Griga Posted October 11, 2020 Share Posted October 11, 2020 https://www.dvbviewer.tv/forum/topic/59624-dvbviewer-600/?do=findComment&comment=490604 https://www.dvbviewer.tv/forum/topic/59626-dvbviewer-media-server-2000/?do=findComment&comment=490605 Quote Link to comment
6hzzz Posted October 11, 2020 Share Posted October 11, 2020 22 hours ago, Griga said: https://www.DVBViewer.tv/forum/topic/59624-DVBViewer-600/?do=findComment&comment=490604 https://www.DVBViewer.tv/forum/topic/59626-DVBViewer-media-server-2000/?do=findComment&comment=490605 Please update avs3 support for transedit synchronously, thanks! Quote Link to comment
Griga Posted October 12, 2020 Share Posted October 12, 2020 https://www.dvbviewer.tv/forum/topic/2745-transedit/?do=findComment&comment=490724 Quote Link to comment
love727 Posted October 13, 2020 Share Posted October 13, 2020 On 2020/10/12 at PM12点07分, Griga said: https://www.DVBViewer.tv/forum/topic/2745-transedit/?do=findComment&comment=490724 Many thanks Quote Link to comment
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