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fsphil / hacktv

Analogue TV transmitter for the HackRF
GNU General Public License v3.0
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Is it possible to pipe the audio from hacktv to the pc's audio jack? #93

Open 03stevensmi opened 1 year ago

03stevensmi commented 1 year ago

Hey guys. I'm loving the use of hacktv on the vga fl2k. But as you all know thees no audio.

So my question is, Would it be possible for hacktv to have the option to output the audio sepratly to the pc's audio jack?

That way when hacktv is playing the video, Red and white composite cables can be used sepratly with the use of the audio coming from the pc, Instead of the vga.

Would this be possible? If so, how?

Cheers

Edit: Anyone there? I really need someone to look at this to see if this is possible.

I have been trying to do this myself by attempting to spilt the video to pipe 1 and the audio to pipe 2 using ffmpeg. Then trying to figure out how to pipe the video output to hacktv, at the same time piping the audio to the Pc's output device so it will play the audio along with the video. So far I haven't been able to successfully accomplish this.

Would be easier if hacktv had a stdout option? Would that be possible?, if not, Then what could be the way that can possibly be done to output the audio to the pc?

Thanks guys ;D

fsphil commented 1 year ago

Not at the moment. It should be relatively simple to add though, but there may be issues with A/V sync.

03stevensmi commented 1 year ago

Not at the moment. It should be relatively simple to add though, but there may be issues with A/V sync.

Ah you beet me to it. I just updated the question after you replied.. Is there any way I could test? I'm also aware about the a/v sync issue that could arise, but its better than nothing. ;)

03stevensmi commented 1 year ago

Can I test this out please?

Thanks

fsphil commented 1 year ago

There's nothing to test yet, it still needs to be coded :-)

03stevensmi commented 1 year ago

There's nothing to test yet, it still needs to be coded :-)

will it be possible to code this?

fsphil commented 1 year ago

Yes, but I can't say when I'll get time. There are a few other things I need to fix/improve first.

03stevensmi commented 1 year ago

Yes, but I can't say when I'll get time. There are a few other things I need to fix/improve first.

Ok. Thanks man. Will keep an eye out on here for updates and fixes etc. Cheers man. Really appreciate all the hard work that you all do.

03stevensmi commented 1 year ago

I will leave a quick mention of this on the discord also, but i have found a way (or github fork) that will enable pcm (raw wav) audio output through the green (or optional blue) pin along with composite baseband video on ther fl2k.

Git: https://github.com/vrunk11/fl2k_2

audio encoder: pcm_s16le

sox & ffmpeg: ffmpeg -vn -i ".\Video-audio-input.mkv" -acodec pcm_s16le -f wav - | sox -b 16 -c 1 -r 88.2k -e signed-integer -t raw - -b 8 -r 13500000 -e signed -t s8 audio.pcm

Fl2k_2 video (with audio): hacktv -o - -m pal -t uint8 -s 13500000 --wss 4:3 --logo multichoice --interlace --vitc test:pm5544 | fl2k_file2 -s 13500000 -signR 0 -R - -R8 -G audio.pcm

would this be a way to get audio for the fl2k device? i have tried it and can confirm that it does accually work with hacktv vid&audio. only problem is i have to use ether sox or ffmpeg to convert or resample the audio from video file to pcm_s16le.

if there is a way to do the video file's audio conversion to match hacktv's video samplerate with pcm_s16le in real time ether by pipe or in hacktv itself, could that be supported in hacktv?