BtbN changed the topic of #ffmpeg to: Welcome to the FFmpeg USER support channel | Development channel: #ffmpeg-devel | Bug reports: https://ffmpeg.org/bugreports.html | Wiki: https://trac.ffmpeg.org/ | This channel is publically logged | FFmpeg 7.0 is released
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<nicolas17>
I want to hardcode/burn subtitles into a video, but they are not quite in sync, how do I delay the subtitles by 0.6 seconds?
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<MisterMinister>
another|: thanks
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<nicolas17>
hmph how do you turn 16:9 video into 4:3 reasonably?
<nicolas17>
I'm thinking of splitting the difference between cropping and letterboxing
<CounterPillow>
Damn it really does sound like you're making the worst encode anyone has ever had the displeasure of receiving, best of luck my man.
<nicolas17>
CounterPillow: for the next step I need to figure out where I can buy a blank VHS in this day and age
<CounterPillow>
Alright yep
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<nicolas17>
CounterPillow: and I don't think I have a good way to connect my computer to the VCR
<nicolas17>
so I might need a DVD intermediate lol
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<nicolas17>
oh raspberry pi has composite video output, that will make this so much easier
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<farter>
hi here's my third question about color range: when converting rgb24 to yuv using sws_scale api call, does full/limited range difference take place here? is it necessary to pass in AV_PIX_FMT_YUVJ444P since there seems to be no other way to sepcify i want full range yuv?
<JEEB>
swscale has range flag
<farter>
neither sws_getContext and sws_scale get avframe or some context so seems it can't get the color_range
<farter>
oh wut
<JEEB>
yea the avframe interface doesn't read it from the avframe (yet), IIRC. but it's there in the context I'm pretty sure since I dealt with that mess like four years ago
<JEEB>
yea, see swscale.h and sws_setColorspaceDetails
<JEEB>
I hope that soon the AVFrame based stuff will take it from the AVFrame
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<farter>
ah just didn't find that... and took a look at the code, seems YUVJ is still handled now? so... will those YUVJ pix_fmt's eventually be deleted?
<farter>
not sure how soon can i get calls to setColorSpaceDetails working haha
<farter>
ff_yuv2rgb_coeffs, scary
<JEEB>
yea, YUVJ is in the process of being removed but still there since the removal hasn't been full yet.
<farter>
my code in this part is from official example and it seems to alloc 2 AVFrame's, fill one with data, then sws_scale is called with buffers pointers and pix_fmts (no color_space here) from the two frames. is it expected that in the future there will be something like avframe_scale(AVFrame *a,AVFrame *b) with everything read from the avframe?
<JEEB>
there is already an API that utilizes the data buffers in the AVFrames
<JEEB>
sws_scale_frame
<farter>
will setColorSpaceDetails still be part of api, or should these be set on avframe?
<farter>
ooooooooh
<JEEB>
also the other sws_frame_* things and sws_send/receive_* , sws_scale_frame being the simplest use case in one call
<farter>
that's just doc/examples/mux.c.... is it safe to just replace that single sws_scale call with sws_scale_frame?
<JEEB>
if you're utilizing normal AVFrames and buffers in them, yes. vf_scale uses the swscale AVFrame API, and that's being utilized by most ffmpeg users
<farter>
then i'm still in doubt... which part of the info will be used according to SwsContext (sizes? pix_fmts?), and which else will be read from those 2 AVFrames (color_ranges?)? it seems kinda unspecified...
<JEEB>
the color props to my knowledge atm are unused from the AVFrames since the implementor left that for the next person
<JEEB>
which is why I was hoping that in the future it'll take those into mention
<farter>
k.. many thanks
<farter>
maybe... sticking to pix_fmt YUVJ for now will make my life easier
<JEEB>
right, it also allocates you the dst AVFrame buffer if the context is defined.
<JEEB>
TIL
<JEEB>
(and if the buffer is not available in the dst AVFrame)
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<farter>
also there's colorspace related data in both avcodeccontext and avframe, idk where which will be used
<farter>
hope this don't make more trouble in the future
<JEEB>
I would just look at AVFrame
<JEEB>
since that is the decoded result and it is supposed to include both the possible global things that end up in avctx as well as possibly dynamic changes during decoding
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<Nemo_pi>
can i borrows someones code for an autoloading flv or mp4 vidoes to stream to twitch?
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<Nemo_pi>
none of my autoloaders works nor being stable
<ManDay>
only 11 more tickets and we get #11111 as ticket number :)
<Nemo_pi>
i only can run 1 file for hours
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<Nemo_pi>
:) if i can get some help with it i would be happy
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<Nemo_pi>
ManDay: i - ofcourse - mean to use ffmpeg to stream it to platforms
<Nemo_pi>
using ffmpeg - with a script who autoloads the videos - to stream it into the void named twitch
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<Nemo_pi>
I have multiple .bash scripts but they all break when its changing video
<ManDay>
line 23 needs a ==, not a =
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<ManDay>
but ask #bash for help writing your script. this channel is about using ffmpeg (cli, api, dev, etc.)
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<Nemo_pi>
I can ask .bash, but i use ffmpeg and i encounter problems with ffmpeg never the less which script i use
<ManDay>
if you have error output from ffmpeg paste it and we can look at it
<ManDay>
where do you get the idea from that you can just pass a TXT file as -i to ffmpeg though
<Nemo_pi>
concat
<Nemo_pi>
plus many people online are posting about the fact that they made autoloaders for ffmpeg
<ManDay>
well to answer your question i don't have an "autoloader" i could give you, but if you want to solve a concrete error go ahead and show us
<Nemo_pi>
Also i need to learn how to fix keyframe interval issues in the commandline which i use for ffmpeg
<Nemo_pi>
currently i run things as: ffmpeg -re -stream_loop -1 -i [location-of-file] -c copy -f flv rtmp:[twitchlink)
<Nemo_pi>
do i need to run it with -g 60 or -g 30?
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<Nemo_pi>
(ps: does -reconnect 1 -reconnect_at_eof 1 -reconnect_streamed 1 work? or is that too much for ffmpeg?
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<Nemo_pi>
Non-monotonous DTS in output stream 0:0; previous: 19900, current: 19843; changing to 19900. This may result in incorrect timestamps in the output
<Nemo_pi>
when i use the Autoloader.bash
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<Nemo_pi>
ManDay: do you have an working example where you let ffmpeg to use all the files in the folder to be streamed to twitch?
<Nemo_pi>
a working concat with a .txt or some voodoo
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<Nemo_pi>
is there a way to get > ffmpeg -re -stream_loop -1 -f concat -safe 0 -i playlist.txt -c copy -f flv [link] < working
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<Nemo_pi>
somehow it doesnt wanna pick-up the playlist.txt
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<BtbN>
You can't concat arbitrary files like that
<BtbN>
they need to be perfectly compatible. It's not a playlist
<Nemo_pi>
then tell me, learn me, explain to me how i can use ffmpeg to play all mp4s or flvs from a folder
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<Nemo_pi>
like a jukenox
<BtbN>
I don't think that's something ffmpeg can do just like that
<BtbN>
sounds more like you're looking for a video/audio player
<Nemo_pi>
video jukebox for twitch
<BtbN>
Easiest way would be to just loop over all files with a shell loop, and invoke a fresh ffmpeg instance for each
<BtbN>
random files are just way too messy, they can change resolution, framerate, ...
<Nemo_pi>
i thought -c copy fixed that
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<BtbN>
flv does not support resolution/fps changes iirc
<BtbN>
so I don't see how -c copy would fix anything
<BtbN>
with -c copy even the codec could change at random, which is even worse
<Nemo_pi>
a fresh ffmpeg means shutdown the stream, reload new file, restart stream?
<BtbN>
That's up to your service provider to handle
<BtbN>
most don't care about a drop for a split second
<Nemo_pi>
so concat is not the option
<BtbN>
But if you use -c copy, you will also have to make sure all your input files are compatible with flv and the streaming provider
<Nemo_pi>
yes :)
<Nemo_pi>
i can understand that part
<Nemo_pi>
all files single work, but maybe you are right about chaining them can break things
<BtbN>
Just use OBS, and have it capture a video player?
<Nemo_pi>
:) all i want is a mp4/flv player which streams to twitch
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<BtbN>
You're probably gonna have to write one first then
<Nemo_pi>
BtbN: i run it from a Raspberry pi 3+
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<BtbN>
you could probably cook up some script that builds an ffmpeg invocation that uses the concat filter on however many files it finds, and then re-encodes and scales them all to the same
<Nemo_pi>
i tried many, none works well
<Nemo_pi>
thats why i came here
<Nemo_pi>
and here sended me to the bash guys
<Nemo_pi>
and now i am back
<BtbN>
well, you'll need to write it, since it's your usecase
<Nemo_pi>
is there a way to use mpv for the source?
<Nemo_pi>
so that mpv can handle the file swaps,
<BtbN>
Might as well just use OBS then
<BtbN>
Or just pre-encode the whole stream into one file elsewhere
<Nemo_pi>
OBS doesnt run on Pi 3+
<Nemo_pi>
on my game pc i can do that, but i dont wanna have it 24/7
<BtbN>
A Pi3 is horrendously underpowered for streaming anyway
<Nemo_pi>
it handles well 1 file at a time
<Nemo_pi>
hehehee
<Nemo_pi>
Other question
<BtbN>
Well, for what you plan, you either need to constantly re-start the stream, which you don't want. Or need to re-encode, which I don't see a Pi3 doing in real time.
<Nemo_pi>
how to pre-code all files from 1 folder into 1.mp4 or 1.flv
<Nemo_pi>
i know ffmpeg goes 1 to the other
<Nemo_pi>
but can it consume all and parsh (is that a word) into 1?
<Nemo_pi>
it only works if the code is been used in the same cd right?
<Nemo_pi>
cd /folder?
<Curid>
you can specify full paths to the videos
<snoriman>
hey! I've been trying to get pw-record (pipewire) to work but I keep getting buffer underrun issues and I thought maybe I can record audio using ffmpeg. I was reading the wiki about alsa where it's documented that you should use `arecord -l` to get the device id; though the device from which I want to capture is not listed (hdmi output). When I use `wpctl status` I do see my device listed. Why is