I am looking again to professionally transfer recordings that have been recorded over the years via OTA antenna onto DirecTivo HD DVRs. I want to transfer them losslessly onto a very large computer hard drive. Compression is OK as long as it is lossless. I thought I had this problem solved with the Korean Skydigital SKY CaptureU 3.0 external capture card after a very thorough discussion in this thread from 2017 during which I learned a lot. This capture card worked for a while, but now it won't even display the video being inputted. I keep getting filter load and filter connect errors telling me that the driver may not be properly installed and to reinstall the driver. I have the last known driver and the company Skydigital and its website now appears to be defunct with no new drivers. Reinstalling the Skydigital capture software and drivers does nothing. The capture card worked on Windows Vista, but now I'm using Windows 10, so I assume that's the problem.
I still have the same goal to transfer this recorded material. I am now recording OTA directly onto my HDD via a tuner card, which solves the problem going forward but doesn't help transferring the OTA material that's been recorded in the past, so unfortunately I'm kind of back to square one with this.
Has any established company come out with a video capture card that records losslessly and also captures 5.1 audio? Or is there any other way to achieve my goal?
And what's the latest on HDCP strippers? I have an older one, but I don't know if it strips the latest version or not. I'm just trying to strip HDCP off of OTA broadcast content, not copyrighted stuff.
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Well...I take it that from the complete lack of response about this that it is still difficult or impossible to do this. usually_quiet, you've been unusually_quiet! And I wish vaporeon800 were still around. I just don't see why in 2019 I have to hire a video engineer to get this done.
Anyone care to comment, even if it's that you've never heard of a capture card that can accomplish this with material that has already been recorded? I know that it can be done with tuner cards on live broadcasts (which I currently do as much as possible), but my issue is doing it with material from the past that's already been recorded.
Do you really need me to respond when all I can tell you is that I am unaware of anything new since 2017 that will allow you to easily capture 5.1 audio plus losslessly compressed video at the same time?
The Magewell Capture Pro HDMI still teases the possibility of capturing 5.1 audio but I have found nothing so far indicating that anyone has written software that allows capturing both 5.1 audio and losslessly compressed video at the same time from an HDMI source with this device.
OTA content *is* copyrighted. The law merely grants consumers the right to record TV in order to watch broadcast TV at a convenient time.
Last edited by usually_quiet; 23rd Apr 2019 at 17:03. Reason: HDCP strippersIgnore list: hello_hello, tried, TechLord, Snoopy329
FLP437, any chance Magewell tech support could shed light on how to do this?
Some DVD players and the like sometimes do have in the settings the option to output as lpcm I don't know if it's the case.
Also if you do have a S/PDIF that can output as lpcm you can use some sort of hdmi embedder like this one
See my previous answer in this thread, post 120 related to the magewell card.
The only problem so far is I haven't been able to use any multichannel dolby hdmi embebbed version only lpcm or any DTS flavour both up to 7.1.
Last edited by FLP437; 23rd Apr 2019 at 17:28.
The magewells have the capability in their sdk, but you'd have to build your own app. I thought the blackmagic devices had a similar capability, as I have seen a few references to links regarding multichannel audio capture with them when I googled it in the past.
I'm guessing that those who really need MCaudio along with their HDMI video captures would probably get an HDMI de-embedder and output AES or mc analog to a dedicated pro audio capture card.
update 2 (build 40879)
Capture mode changes:
list more audio devices (helps with Magewell)
fixed P210 support
update 1 (build 40716)
Capture mode changes:
can select any video codec / any output format
audio can have up to 8 channels
"channel mask" option for audio
panel shows important processing in effect
In your other post in this thread, you said that capturing 5.1 channel Dolby Digital using the Magewell Capture Pro HDMI didn't work. Has that changed in Virtualdub2 update 2 (build 40879)?Ignore list: hello_hello, tried, TechLord, Snoopy329
I have not tested recently so I don't know if anything as changed, however I suspect that nothing have changed but I don't think it's a virtualdub2 related problem as with the other options magewell capture express 3.0, Graphstudionext I had the same problem, so more inclined to think that is some hdmi related problem ( edid ,etc ) dolby output hdmi vs S/PDIF or a card decoding problem. For sure now is the support to up to 8 LPCM or 8 DTS hdmi embedded channels .
The statement from Magewell “Support for capturing of IEC60958/IEC61937 audio, including uncompressed audio such as 5.1 channel, 7.1 channel, DTS, THX, SRS and compressed audio such as AAC and MP3” is also not completely clear with regard to dolby.
I will do in the weekend some tests to see if anything as changed if not I will try to contact magewell support about the issue.
If the problem persist you can try black magic the intensity for instance it's also supported by virtualdub2.I don't know however if there are also any issue.
However in general I do prefer the magewell is less triky and more stable and flexibe more feature rich pcie 2.0 vs 1.0 more advanced chipset adv 7842 vs adv 7180 faster and larger video buffer , etc.
It seems that somebody has already been able to capture ac3 dolby 5.1 hdmi embebbed using ffmpeg and a magewell card
Based on my, FFmpeg example capture command line for two audio channels
FFmpeg -threads 8 -f dshow -video_size 1920x1080 -framerate 25 -vcodec v410 -rtbufsize 702000k -i video="Video (00 Pro Capture HDMI)":audio="Audio (00 Pro Capture HDMI)" -acodec pcm_s16le -ar 48000 -ac 2 -vcodec ffv1 -level 3 -coder 1 -context 1 -g "1" -slices 24 -slicecrc 1 -y "E:\Test_FFV1.avi"
Also if someone has already been sucessfull it's not a card problem . The weird thing is when I use a dolby digital hdmi source the card only identifies 2 audio channels and acts accordingly however if I put instead an lpcm or dts hdmi embedded audio source it identifies correctly the input and record the streams correctly.
Last edited by FLP437; 25th Apr 2019 at 13:47.
Ignore list: hello_hello, tried, TechLord, Snoopy329
As I wrote in an earlier post in this thread, due to bandwidth limitations, S/PDIF cannot supply more than two channels of LPCM. LPCM is uncompressed digital audio. S/PDIF can only supply 5.1 channel audio if the audio is compressed using Dolby Digital or DTS.
[Edit] FLP437 is going to experiment further with ffmpeg to see if he can get DD to work. You can also ask him if there are audio delays introduced by the Gofanco embedder.
Last edited by usually_quiet; 27th Apr 2019 at 11:47.Ignore list: hello_hello, tried, TechLord, Snoopy329
Just a thought...
Parties also may need to remember this is similar to the old AC3WAV or AC3onCD days: For an ac3 (or any compressed bitstream for that matter) to be used properly with SPDIF, padding bytes must be added in order for the throughput payload to match what is expected by the spec.
Lacks of that may be what is hindering inclusion.
And the presence of it will thwart decoding until the padding is removed first (or a decoder that is aware of this variant type is used).
Ignore list: hello_hello, tried, TechLord, Snoopy329
@ end-user I don't know why I never thought about asking about this before but here goes: Did you ever try using kmttg to transfer those .tivo files to a PC? (Moved here from another of your current threads on a related subject)Ignore list: hello_hello, tried, TechLord, Snoopy329
After researching it for a few days, it appears that kmttg can only transfer .tivo files from standalone Tivo units, not from DirecTV Tivo THR22 or earlier like I have. And even on the standalone Tivo units, they don't allow transfer of certain "Copy proected" files, which ends up being about half the shows on the Tivo unit. It was a great thought though, usually_quiet!
The Besweet solution sounds complicated but possible. Would there be no audio information lost in any of the six 5.1 channels in the conversion of AC3 to 6 ch LPCM by Besweet?
I wonder if FLP437 has had time to test his Magewell card with the ffmpeg modification to see if the Magewell can capture 5.1 audio?
Yes, kmttg only works for converting recordings which are marked "copy-freely". All recordings from local OTA broadcast sources should be marked copy-freely and I thought that the recordings that you wanted to save fit that description.
Besplit . They are supposed to be able to undo the formatting. (Besplit command line: BeSplit -core( -input myfile.wav -prefix myfile -type ddwav -fix ) I don't know what the Besweet command line is. VLC is supposed to be able recognize and play DDWAV files, but turn volume way down just in case.
Last edited by usually_quiet; 1st May 2019 at 10:48. Reason: grammar, clarity & fix linkIgnore list: hello_hello, tried, TechLord, Snoopy329
If I'm incorrect on this and standalone TIVO units do actually capture the transport stream directly as MPEG-2, I might actually buy one as a backup or use it to experiment and see if the video recorded by the TIVO (which would then be transferrable to my computer hard drive via kmttg) is better than the video recorded directly onto my hard drive by a Hauppauge tuner card, which is currently being discussed in my other thread. Does anyone know?
Of course another problem is that standalone TIVO units can't be used with DirecTV but I might be willing to forego that on one TV set.
I've read reports that say the Bolt does a good job playing its recordings but most buyers want the TiVo for its great program guide and advanced scheduling features for recordings. I'd rather save some money and use a 4-tuner Hauppauge TV card or 4-tuner Silicondust Connect Quatro instead.
Note that VideoReDo TV Suite is supposed to be able to work with .TIVO files as well as .ts and .mpg files from TV tuner cards.
Last edited by usually_quiet; 2nd May 2019 at 23:42.Ignore list: hello_hello, tried, TechLord, Snoopy329
Back in the day I remember there were few Windows XP programs that can extract recordings from DN and DTV PVR's hard drives. It has been a while now and finding them is not easy.
I made some additional tests
Magewell card with latest driver / firmware and the more recent virtualdub2 build .
Nothing has changed, It’s possible to capture LPCM and DTS HDMI embedded audio up to 8 channels in LPCM or AC3 (AC3 compression selected in virtualdub2 , if the source is up to 5.1).
All DTS flavor’s up to 8 ch. seem s to work namely DTS-HD Master audio
With Magewell capture express v 3.0 witch does only work with h.264 and AAC video / audio encoders ,I got similar results only Dolby versions don´t work (they work but I get stereo audio). Using Multiaudiocapture SDk utility I got same results.
Audio file captured with the SDk utility has 24 bit depth as the original stream so I thought it could be bit-accurate 2-channel PCM, as so I tried to use besweet to decode and demux but didn't work either. I played around with ac3rec ,eac3to and besplit but no luck. However I don't know for sure if I have done it correctly, but I don't hear any noise from the captured file is a clear audio record so it seems more a decoded and down mixed stereo version then a compressed undecoded version
I have put a sample capture from the SDk utility if anybody are willing to try to decode it and confirm it is a ddwav ( compressed AC3 wave file) or a standard stereo pcm file.
As virtualdub2 can´t record 24 bit depth audio I also thought about shotcut and total record the only applications I know that can record video and 24 bit audio. But both app do have problems, shocut current releases crash with directshow capture devices namely magewell so I tried with an older version that did work but could not get a correct video capture. However if I do have more time I will explore a little more this path. I had also some problems with total record in the past so I have not tried it now.
Related to the gofanko embedder as I don’t have one I can not test it and that wouldn't solve the problem either as already evidenced by usually_quiet.
Didn´t try the Linux way as I don´t have a linux machine at hand and also because I didn't like the idea to take out and in multiple times a pcie card ( it´s not really a plug and play usb device) as I have a very stable capture station with the magewell and don’t want to change that.
I was not able to mimic the Linux alsa pipe command for windows don't know if it can be done ,my knowledge is not enough so far .But I’m willing to test, if someone Is willing to make a similar command line for windows.
There are 2 or 3 audio cards that are said to have a toslink input and able to record a faithful 24 bit audio file, but if they do work it will be necessary to capture with virtualdub2 simultaneous from different sources ( audio and video, not a big deal however), demux the audio afterwards, decompress with besweet or similar utility and remux again .However it seems these cards are very unique and difficult to identify for sure.
I have contacted the magewell support about the situation and got the following answer
"AC3 DDPlus and True HD are all encoded audio. According to IEC61937 standard, this kind audio is transferred by two channel. You just need to get the whole audio data and decode them to multi-channel LPCM audio."
So the problem is how to get the whole audio data and after how to decode it
FLP437, bravo for doing all of that research. It is much appreciated! It helps us know what won't work. It sounds like the solution with the most promise is the Linux modification of ffmpeg + Magewell card.
Thank you again for doing all of that extra testing.