ffmpeg and VLC as streaming server - relay

[logicom]

Hi,

I managed to make ffmpeg part, evrything is correct once I open udp stream with ffplay.
I try several times to relay /reencapsulate udp stream having VLC as streaming server over http protocol /port.
While ffmpeg encodes in the background , the problem is that vlc doent even want to show the stream ex: udp://127.0.0.1:1234 while ffplay works.
Any sugestion on how to match ffmpeg as encoder and VLC as a server ?

Regards.

[Baldrick]

How does your ffmpeg command line looks like?
Any error in vlc? Check the vlc messages(Under tools).

[logicom]

I am answering from another location now,
but this is the example of the ffmpeg line I am using:

ffmpeg -f dshow -i video="input card":audio="input card auidio" -c:v libx264 -preset ultrafast -tune zerolatency -b:v 800k -c:a libvo_aacenc -b:a 128k -f mpegts udp://127.0.0.1:1234

VlC did not pop with any error, it just doesn't willing to show the content neither to re-stream it, it is idle.

I could provide log from VLC latter on.

Regards.

[Baldrick]

Hmm. No I don't know why it wont work with vlc.

I have only used vlc to stream and you can use similar settings as ffmpeg...it should also work with capture cards, see https://wiki.videolan.org/Documentation:Streaming_HowTo/Command_Line_Examples/ . But you maybe have tried that.

[logicom]

I try to capture transcode and stream from VLC and it works. However that was not the point.
I wanted ffmpeg as encoder while relaying this stream over http, practicaly using VLC only as a streaming server.

Regards.

[Baldrick]

I thought so. You can also ask or search in the vlc forum, https://forum.videolan.org/

Let us know if you find a working solution.

[logicom]

Well,

I got this on vlan forum:

Not sure vlc - works on Windows.

however on

https://trac.ffmpeg.org/wiki/StreamingGuide

it is mentioned that this kind of thing is possible so I have been trying the following:

piping method with the two different ways for passing the arguments to the VLC:

ffmpeg -re -i "clip.mp4" -c:v copy -bsf:v h264_mp4toannexb -f mpegts - | "C:\Program Files (x86)\VideoLAN\VLC\vlc.exe" ":sout{dst=http{mux=ts,dst=:10000/}:sout-keep" -

fmpeg -re -i "clip.mp4" -c:v copy -bsf:v h264_mp4toannexb -f mpegts - | "C:\Program Files (x86)\VideoLAN\VLC\vlc.exe" -vvv - --sout-tandard-access=http --sout-standard-mux=ts --sout-standard-dst="localhost:10000/" --sout-keep

VLC opens the stream trough the file descriptor interface

fd://0

and shows it.

I suppose that second part doesn't work possibly due to the:

- inexistent/unspecified buffers,
- possibility that transcoding module must be invoked in this kind of flow (which I don't need)

with the second method using looback interface I managed to make it:

ffmpeg command line ends/send transport stream to:

-f mpegts udp://127.0.0.1:9000

I am calling VLC from bat file:

VLC.exe udp://@:9000 :sout={dst=http{mux=ts,dst=:10000/}:sout-keep

and on port 10000 I am getting stream relayed (pull mode) but over http protocol.

I would really like to discuss further how to make the first method working (one with piping). Just for fun...

Regards.