I want to live stream video from webcam and sound from microphone from one computer to another but there is some problems.
When I use this command line:
ffmpeg.exe -f dshow -rtbufsize 500M -i video="Camera":audio="Microphone" -c:v mpeg4 -c:a mp2 -f mpegts udp://127.0.0.1:1234
FFmpeg console starts filling with yellow color messages and stream becomes unstable: http://s16.postimg.org/qglcgr345/Untitled.png
To solve this problem I have added new parameter to the command line to set the frame rate -r 25:
ffmpeg.exe -f dshow -rtbufsize 500M -r 25 -i video="Camera":audio="Microphone" -c:v mpeg4 -c:a mp2 -f mpegts udp://127.0.0.1:1234
After I added -r 25 problem with yellow color messages disappears but then appears another problem. When I fresh start FFmpeg with this command line video and sound looks synchronous but after one or two minutes appears ~25 seconds lag between video and sound, sound goes behind video. I have tried that with different protocols UDP, TCP, RTP but problems are the same. Please help me!
I found answer for my problem with "-r" and asynchronous audio and video. Who is interested answer is here: https://trac.ffmpeg.org/wiki/DirectShow (in paragraph "Specifying input framerate").
Related
When I record both audio and video using ffmpeg the audio recording cuts out for the last two seconds of the video.
ffmpeg \
-f v4l2 -i /dev/video0 \
-f alsa -i hw:2 \
samples/video.mp4
I have tried using different audio and video codecs, as well as different video formats and I, have noticed that mpg format instead of mp4 the audio works better.
I have also tried using different codecs with the mp4 and checked the compatibilities wikipedia but they don't seem to matter much.
So adding the following line seems to solve the problem.
-preset ultrafast -threads 0
I would like to know if its possible to stream a png or any kind of image using ffmpeg. I would like to generate the image contiously using nodejs that updates every 10 seconds. I would like to display game stats with this in a corner and mix it with some background music or pre recorded commentary on it. Additionaly i would like to mix a video and the image should act like an overlay.
I am also not sure if using a transparent png image its possible to do
I couldn't get my head around doing the mixing with ffmpeg and its looks very complicated so i would like to get some help on it.
I have video files stored in a folder that i would like to continously stream and mix different music and an image on it. I would like to have it all continously working without stopping the stream.
Is it possible with ffmpeg cli on linux or i cant avoid using a desktop windows pc for such thing?
Well after digging through the documentation and asking for help on irc i came up with the following command:
First i store the list of tracks in a txt file such as:
playlist.txt
file 'song1.mp3'
file 'song2.mp3'
file 'song3.mp3'
Then i want to concat the tracks so i use -concat and specify the input as a txt file.
The second thing is using a static image as an input that i can manually update.
ffmpeg -re -y -f concat -safe 0 -i playlist.txt -framerate 1 -loop 1 -f image2 \
-vcodec libx264 -pix_fmt yuv420p -preset ultrafast -r 12 -g 24 -b:v 4500k \
-acodec libmp3lame -ar 44100 -threads 6 -qscale 3 -b:a 128k -bufsize 512k \
-f flv "rtmp://"
The rest is specificing the output format and other settings for streaming.
Thats what i came up with so far, not sure if theres any better way of doing this but right now it is sufficient enough for my needs.
I'm using latest static build of ffmpeg windows.
My input file (.mkv) is:
[video] - 1080, V_MPEG4/ISO/AVC, 14.6 Mbps, ID#0
[audio] - DTS 5.1, 1510 Kbps, ID#1
[subtitles] - S_TEXT/ASS Lossless English, ID#14
My problem is this: I convert the audio, so that my target player, a XB1 console (media support faq), is able to play audio/video. However sometimes its rather difficult to hear or parts may be in foreign language, so I want to force the english subtitles into the mix at the same time I convert the audio.
Currently for the audio, I use the following command
ffmpeg -i input.mkv -codec copy -acodec ac3 output.mkv
Can I somehow tie in the forced subtitles (onto the video) in order to save an extra process of taking the output.mkv and trying to force subtitles on?
Edit: I've tried using the following command to extract subtitles to be able to edit them
ffmpeg -i Movie.mkv -map 0:s:14 subs.srt
However i get the error: Stream map '0:s:14' matches no streams
Edit2: attempted to extract subtitles and succeeded with
ffmpeg -i input.mkv -map 0:14 -c copy subtitles.ass
but still looking to force the subtitles, nonetheless!
Also - a little bonus to this question - can I somehow extract the .ass file and edit it to only produce subtitles for foreign parts - so english audio doesn't have subtitles during the movie but foreign audio does have subtitles?
Cheers
Edit3:
When I try to use both of the commands at once (my earlier mentioned audio converter & one from the ffmpeg wiki)
ffmpeg -i input.mkv -codec copy -acodec ac3 -vf "ass=subs.ass" output.mkv
I get the following error from ffmpeg,
Filtergraph 'ass=subs.ass' was defined for video output stream 0:0 but codec copy was selected.
Filtering and streamcopy cannot be used together.
Since your media player does not support subtitles, the text has to be burnt onto the video image. For that, use
ffmpeg -i input.mkv -vf "ass=subs.ass" -c:v libx264 -crf 20 -c:a ac3 output.mkv
This will re-encode the video, since text is being added. The CRF value controls the video quality. Lower values produce better quality but larger files. 18 to 28 is a decent range to try.
I want to capture the RTSP stream from some IP cameras, and after looking around I found 2 great tools to do this: avconv and openRTSP
openRTSP -u user password rtsp://10.48.34.125/axis-media/media.amp
avconv -i "rtsp://user:password#10.48.34.125/axis-media/media.amp" -vcodec copy -f mp4 10.48.34.125.mp4
but for some voodoo reason when I need to use URLs without an specific extension, such as:
rtsp://user:password#10.48.34.46/
avconv returns 401 Unauthorized
so I'm stuck with openRTSP at the moment...
The thing is, unlike avconv, openRTSP outputs a raw file which is encoded to 25fps, which made some of my videos look like they where in fast-forward. I found a (cpu expensive) way to re-encode the file to a closer frame rate to what I need:
avconv -r 7 -i video-H264-1 -r 24 -f mp4 10.48.34.28.mp4
(in this example I'm forcing the frame rate of the raw file to be 7, and the frame rate of the output file to be 24. I tried using openRTSP build-in flags, but the output file still had a frame rate of 25: openRTSP -f 7 -u user password rtsp://10.48.34.145/mpeg4/media.3gp)
Sadly the video looks odd at certain points, and that's because the original stream sometimes has a variable frame rate (for example at night).
My question is, is there some way to deactive this default encondig to 25fps?
And why 25? I mean, isn't the norm 24?
try:
avconv -rtsp_transport tcp -i rtsp://server -an -vcodec copy -f mp4 10.48.34.28.mp4
if you want to change original video rate to 24 you must transcode it:
avconv -rtsp_transport tcp -i rtsp://server -an -vcodec libx264 -r 24 -f mp4 10.48.34.28.mp4
So I'm trying to stream on YouTube using a raspberry pi. The idea is for one raspberry pi to be used to stream the connected webcam and for another to display the stream, sort of like a surveillance camera. Both raspberry pi's are currently using Raspbian.
So is it possible for me to stream directly to YouTube on a Raspberry Pi.
You can use any Pi supported RTMP/Flash encoder to publish a YouTube live event. One example is ffmpeg which can be compiled on Raspbian.
Create your YouTube live event using the guide. You can find the various encoder settings here.
When everything is ready you can start streaming. For a 640x480#25 700k video stream the command will be something like:
ffmpeg -f v4l2 -framerate 25 -video_size 640x480 -i /dev/video0 -c:v libx264 -b:v 700k -maxrate 700k -bufsize 700k -an -f flv rtmp://<youtube_rtmp_server/<youtube_live_stream_id>
"So is it possible for me to stream directly to YouTube on a Raspberry
Pi?"
Yes. But you're going to need to do a bit of configuring and get different hardware depending on your project needs.
For my project, a day and night doorway "security camera" that streams live to youtube, I chose a Raspberry Pi Zero W running raspbian (headless) and a camera module with auto IR switching capabilities and IR lights.
I have edited the raspbian image so all of the configurations of the wifi and camera module interfaces, code, and dependencies I need are pre-installed, so I can just flash an sd card, slap it in a pi+camera+powersupply setup and it does its thing.
So, for this answer to be helpful at all, you're going to need to do plenty of research on FFMPEG, know what it is, learn what it does, and get it installed on your board... You should be able to run a few tests getting FFMPEG to just spit out maybe a 10-second long video from your camera. I wouldn't bother reading any more of my ramblings if you have not got that far yet, because things are about to get specific.
So, your board is online, you can see it on the network, it's got internet, it's got ffmpeg, it's ready to go.
Here is the ffmpeg "stream command" I use to start the live stream:
raspivid -o - -t 0 -vf -hf -fps 60 -b 12000000 -rot 180 | ffmpeg -re -ar 44100 -ac 2 -acodec pcm_s16le -f s16le -ac 2 -i /dev/zero -i - -vcodec copy -acodec aac -ab 384k -g 17 -strict experimental -f flv rtmp://a.rtmp.youtube.com/live2/SESSION_ID
I arrived at this "stream command" above by tweaking each parameter you see, one by one, and in different combinations and I eventually got a really crisp 1080p stream with no buffering issues at all except for the occasional bit of wifi lag that comes around on my setup. You are going to need to do a ton of research into what every parameter does to get things just right and trust me it's going to be a pain figuring out what does what in the beginning. I would lurk all around StackOverflow and other resources and just plug around and see what you can get to come out of your setup when it comes to these FFMPEG commands.
To test if this "stream command" or any other you find works for you, just change SESSION_ID at the end to your stream key and run it in the console.
After you get an output you are happy with, figure out on your own how you want to trigger your camera to start streaming, if you want it to start recording as soon as the board is ready to start sending data, you accomplish this by putting your "stream command" in /etc/rc.local and it will run that command as soon as it can.
For my project, I use 18650 cells charged by solar panels as the power source so I have to be conscious about the power I use so I wrote some NodeJS program monitor just that.
Alright, that's enough talking into the wind for now. Hopefully, any of this helped someone out there, cheers.
Audio working! This worked for me from a raspberry pi 4 with an rbp v1.3 camera and cheap usb audio interface. Also gets the default audio which you can set in the alsamixer:
raspivid -o - -t 0 -vf -hf -fps 30 -b 6000000 | ffmpeg -f alsa -ac 1 -ar 44100 -i default -acodec pcm_s16le -f s16le -f h264 -i - -vcodec copy -acodec aac -ab 128k -g 60 -strict -2 -f flv rtmp://<destination/streamkey>