[01:23:06 CET] <montana> i am looking for ffmpeg binary with rav1e support [06:01:29 CET] <montana> what does -b:v 0 do [06:09:13 CET] <while> Hi, I am trying to get a higher framerate with ffmpeg rawvideo and bmp encoding [06:09:31 CET] <montana> while what command are you using now [06:10:55 CET] <while> ffmpeg -y -threads 0 -video_size 800x600 -f x11grab -i :2 -f pulse -ac 2 -i default -vcodec bmp -threads 0 -loglevel verbose -s 800x600 -pix_fmt rgb8 -strict -2 -acodec pcm_s16le -threads 0 -ar 44100 -ac 1 -q:a 32 -f mpegts -movflags faststart -tune zerolatency "udp://224.0.0.1:30000" [06:11:59 CET] <while> if I use mpeg2video or libx264 vcodec, it seems to work at the native frame rate (30 fps) [06:12:15 CET] <montana> and what fps do you want [06:12:18 CET] <while> 30 [06:12:31 CET] <montana> and what fps are you getting [06:12:38 CET] <while> about 4 [06:12:43 CET] <montana> i see [06:15:59 CET] <furq> bmp and rawvideo aren't supported in mpegts anyway [06:16:35 CET] <while> strangely, at least the ffmpeg from the debian repositories, seems to behave as though it is [06:16:43 CET] <furq> yeah the muxer accepts almost anything [06:16:51 CET] <furq> but you won't be able to demux it with anything that uses ffmpeg [06:16:55 CET] <furq> and probably not with anything else either [06:17:08 CET] <while> I was able to udp multicast said mpegts stream, and create GIFs from it [06:17:37 CET] <furq> but yeah pal8 800x600 rawvideo will be about 12MB/s [06:17:47 CET] <furq> so at a guess you're bandwidth limited [06:18:37 CET] <furq> or 14 at 30fps, rather [06:19:18 CET] <while> would a localhost multicast address alleviate any bandwidth issues? [06:19:44 CET] <furq> actually nvm i didn't notice it was multicast [06:19:47 CET] <while> and I think I tried writing to a file redirected to /dev/null, and it didn't help [06:19:52 CET] <furq> that shouldn't be an issue then [06:19:55 CET] <while> the cpu is also not maxed out [06:21:22 CET] <while> what could ffmpeg be waiting on? [06:21:26 CET] <furq> shrug [06:21:44 CET] <furq> i get 60fps writing 800x600 bmp in mpegts to multicast [06:22:00 CET] <furq> if x264 runs at 30fps then you're not cpu bottlenecked [06:22:08 CET] <while> what commands did you setup the multicast address with? [06:22:16 CET] <while> and did you use my same command? [06:22:18 CET] <furq> ffmpeg -f lavfi -i testsrc=s=800x600:d=60 -c:v bmp -pix_fmt rgb8 -f mpegts udp://224.0.0.1:3000 [06:23:01 CET] <while> I get 18 fps with that [06:23:23 CET] <furq> what cpu [06:24:05 CET] <while> Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz [06:24:07 CET] <while> from lscpu [06:24:32 CET] <furq> yeah i'm only running this on a ryzen 2600 at stock [06:24:36 CET] <furq> so it shouldn't be that much faster [06:29:41 CET] <while> I found that with your supplied example, making sure I am multicasting on the loopback device results in getting 100 fps from your example [06:30:55 CET] <furq> yeah i just tried it on debian and multicast is way slower than null output [06:31:02 CET] <furq> so i guess it's some kind of multicast throughput issue [06:31:10 CET] <furq> which would also explain why it was fine with x264, since that's much less bandwidth [06:31:58 CET] <furq> i have literally no experience with multicast though [06:32:04 CET] <while> although now my command still has under 10 fps, and 31kbit/s, but your example provided over 100mbit/s, and 100 fps [06:33:02 CET] <while> how are you doing null output? a symlink to /dev/null is still very slow for me [06:33:09 CET] <furq> -f null - [06:41:25 CET] <while> I found running stdout to /dev/null provides my desired 30 fps [06:41:41 CET] <while> and through a udp multicasting netcat command, I can get 22 fps [06:42:33 CET] <furq> you don't need to redirect stdout with -f null, it doesn't output anything [06:42:50 CET] <while> I of course removed that part [06:43:20 CET] <furq> it would be the same speed either way [06:43:31 CET] <furq> since we already know the mpegts muxer isn't the bottleneck [06:46:10 CET] <while> its stuff like this that makes me wonder if there gigabit ethernet 'really' can get a gigabit with the stock hardware you can buy online that claims to [06:50:08 CET] <furq> fwiw i was getting 60fps on windows on the same box [06:50:21 CET] <furq> so at a guess it's some kind of os udp buffer thing [07:00:31 CET] <while> maybe I can multicast with raw sockets to undercut that problem [10:14:24 CET] <lofo> Hey, any idea to monitor an udp stream i create with ffmpeg ? [10:15:06 CET] <lofo> audio is laggy, and video almost a black screen with glitchy stuff on the upper left corner [10:17:04 CET] <cehoyos> Please provide the command line you tested together with its complete, uncut console output. [10:17:18 CET] <cehoyos> Problems with udp are not unusual, the way you describe them sound unusual [10:21:35 CET] <lofo> I haven't used ffmpeg directly yet. I used OBS which uses FFmpeg [10:21:43 CET] <lofo> but im about to try in command line [11:09:27 CET] <lofo> Here is the command : ffmpeg -re -i output.ts -c copy -f mpegts udp://224.0.0.1:8081 [11:09:41 CET] <lofo> here is the output : https://pastebin.com/bB2YcbMz [11:10:58 CET] <lofo> could the fact that i use a multicast address be the problem ? [11:13:35 CET] <cehoyos> Your ffmpeg version is old. Do you see the same A/V desync if you remux to a local file? [11:17:03 CET] <lofo> wait i got to figure out the command line for that (not fluent yet) [11:17:21 CET] <cehoyos> Replace "udp..." with "out.ts" [11:18:56 CET] <lofo> oh thanks. The video is the same after remuxing [11:19:06 CET] <lofo> no desync [11:22:42 CET] <lofo> I wonder how to figure out if its my stream emitter, my router or my stream receiver that is causing the issue [12:36:13 CET] <th3_v0ice> lofo: Maybe your circular buffer is too small. Try increasing it and test again. "udp://224.0.0.1:8081?overrun_nonfatal=1&fifo_size=50000000" [13:36:56 CET] <igssl> anyone know how to export a specific timeframe into a series of images? i can only find links discussing the opposite (encoding image sequences into video) [13:41:49 CET] <hero100> igssl: ffmpeg -i foo.mp4 bar-%d.png [13:54:08 CET] <igssl> hero100 o thx [15:01:39 CET] <lofo> th3_v0ice, the command as you stated it doesnt seem to end on my machine [15:01:45 CET] <lofo> never completes [15:19:58 CET] <DHE> were you careful to escape the '&' so your shell didn't interpret it? [15:41:48 CET] <Anderssen> Hi, I've noticed that the encoder mpeg2video has an option sc_threshold ("Scene change threshold"): is that what I think it is (i.e. ffmpeg inserts an i-frame automatically when the threshold is met)? Also, is there a way to force this on other encoders, even if the option is not listed under "ffmpeg -h encoder=..."? [15:42:34 CET] <igssl> https://pastebin.com/ctBM09dU < wot did i do wrong [15:50:54 CET] <DHE> Anderssen: libx264 has an internal "scenecut" option [15:51:30 CET] <DHE> igssl: windows doesn't support wildcard syntax due to the OS not offering a glob() function [15:51:54 CET] <DHE> even if it did, you have to add "-pattern_type glob" to the commandline [15:52:19 CET] <igssl> i need to list every filename in quotes, then? [15:52:30 CET] <igssl> or can i just put it in a folder and direct ffmpeg to that somehow [15:52:55 CET] <DHE> the preferred style is to rename them to "0001.tif", "0002.tif", ... and then use the pattern "%04d.tif" as the filename [15:53:03 CET] <DHE> correction, start at 0 [15:53:18 CET] <igssl> oh ok [16:02:29 CET] <lofo> DHE, indeed i didnt escaped it :/ [16:02:50 CET] <lofo> tried it. command completed. But result was comparable [16:05:35 CET] <DHE> lofo: if you want to transmit a .ts video via multicast, I recommend tsplay, a standalone application that does just that [16:06:36 CET] <lofo> i do not care about multicast specifically, but the tutorials i was following where using it. I am not aware of the implications of using a multicast address [16:06:58 CET] <lofo> i want to stream to a single device actually [16:08:15 CET] <DHE> gotta be careful with streaming over UDP. the bursty nature of the traffic and lack of controls like TCP provides means that packet loss can happen even on a local LAN [16:08:43 CET] <DHE> tsplay, and when configured correctly ffmpeg, will pace their packet and explicitly delay, say, 2 milliseconds between packets or whatever is appropriate to the bandwidth needs [16:11:41 CET] <taliho> DHE: lofo: FYI instead of TCP you could use zmq [16:11:42 CET] <taliho> https://ffmpeg.org/ffmpeg-all.html#zmq [16:12:18 CET] <DHE> sadly my tv box isn't going to support that [16:12:30 CET] <DHE> nor does my other-the-air capture box [16:12:42 CET] <taliho> ah ok :) [16:25:16 CET] <lofo> i'm gonna investigate what you said DHE and taliho. [16:25:57 CET] <lofo> What protocol would you recommend me to try as an alternative then ? [16:26:07 CET] <lofo> a TCP based protocol ? [16:26:54 CET] <lofo> My final objective is to stream my PC screen session to a VLC running on my phone (or any other tool that reads streams) [16:26:56 CET] <DHE> what's receiving the stream? [16:27:12 CET] <DHE> then probably tcp in listen mode [16:27:30 CET] <lofo> vanilla tcp ? no video-specific protocol ? [16:27:55 CET] <DHE> -f mpegts takes care of the rest of it [16:28:42 CET] <lofo> what do you mean by that ? (i'm trying to get the deepest understanding of whats going on) [16:29:30 CET] <DHE> mpegts over tcp will suffice [16:30:04 CET] <lofo> ok. gonna try that. Thank you DHE [16:31:10 CET] <DHE> on the ffmpeg side, tcp://0.0.0.0:12345?listen=1 # I think.... then on the client side: tcp://192.168.1.23:12345 (where 192.168.1.23 is the IP of the ffmpeg server) [16:31:31 CET] <DHE> I haven't tried this, but I think that's right [16:32:02 CET] <lofo> ok ok. [16:43:31 CET] <lofo> damn it worked :D [16:43:56 CET] <lofo> gotta try with a live feed of my screen now [16:46:45 CET] <rocktop> Hello, how can I merge two videos ( video1.mp4 and video2.mp4) into one video2.mp4 play after video1.mp4? [16:46:58 CET] <rocktop> I am not able to achieve this [16:53:01 CET] <friendofafriend> rocktop: Tried concat? ffmpeg -i "concat:video1.mp4|video2.mp4" -c copy output.mp4 [16:53:26 CET] <furq> that doesn't work with mp4 [16:53:46 CET] <furq> https://www.ffmpeg.org/ffmpeg-formats.html#concat-1 [16:53:48 CET] <furq> this does [17:11:41 CET] <rocktop> friendofafriend: I already use this but I don't know why doesn't ork [17:11:51 CET] <rocktop> it use onle the first video [17:12:06 CET] <rocktop> with no error in output [17:19:40 CET] <rocktop> anyidea ? [17:24:16 CET] <friendofafriend> rocktop: furq's link is right. https://www.ffmpeg.org/ffmpeg-formats.html#concat-1 [17:35:40 CET] <rocktop> friendofafriend: I think it is ok now but when I concat this Two video how can I make input audio stream for the second video fade in ? [17:37:24 CET] <friendofafriend> rocktop: The afade filter. [17:39:45 CET] <rocktop> friendofafriend: how can I use it here : ffmpeg -f concat -i file.txt -c copy output.mp4 [17:42:23 CET] <rocktop> anyidea please ? [17:51:30 CET] <friendofafriend> rocktop: Do you want the audio from the first video to fade out? Are you just trying to crossfade? [17:52:46 CET] <rocktop> how can I use afade filter for the second input stream here : ffmpeg -f concat -i file.txt -c copy output.mp4 [17:53:08 CET] <rocktop> friendofafriend: no just fade in the second [17:53:20 CET] <rocktop> audio [17:53:36 CET] <rocktop> audio and video if it possible [17:54:07 CET] <rocktop> if crossfade possible also will work for me [18:07:02 CET] <friendofafriend> rocktop: There's an example on StackExchange. You'd have to know the duration of the first video in seconds. https://video.stackexchange.com/questions/19867/how-to-fade-in-out-a-video-a... [18:08:26 CET] <rocktop> friendofafriend: Ok thanks [18:16:05 CET] <hyperisco> I am trying to convert a single png into a 10 second video. I just want the video to be the static image. How can I do that? [18:16:15 CET] <hyperisco> I have tried ffmpeg -loop 1 -i background_hr_0d6dab.png -c:v mjpeg -q:v 2 -pix_fmt yuvj444p -r 1/5 -t 10 i1.avi [18:16:36 CET] <hyperisco> This generates 2 frames, which makes the windows media player happy (1 frame it will not play) [18:16:40 CET] <hyperisco> But on other video players it does not play [18:16:48 CET] <hyperisco> I tried more frames and it still won't play [18:16:54 CET] <hyperisco> I tried ffmpeg -loop 1 -i background_hr_0d6dab.png -c:v libx264 -profile:v high444 -crf 0 -framerate 30 -t 10 i1.mp4 [18:17:23 CET] <hyperisco> This will play in VLC but not other players I've tried [18:18:46 CET] <stealthii> hi! I'm trying to replace rgb (with a solid color), but preserve alpha in a video file. I can overlay to do this, but overlay doesn't preserve alpha from the first input. [18:18:51 CET] <stealthii> ffmpeg -i <video_with_alpha>.mov -i <rgb24pngsolid>.png -filter_complex "[0:v][1:v]overlay" output.webm [18:34:59 CET] <stealthii> I found a solution! taking the alpha from the video, and applying it to a "video" of the solid color png. [18:35:04 CET] <stealthii> ffmpeg -loop 1 -i solid.png -i vidwithalpha.mov -filter_complex "[1]alphaextract[a];[0][a]alphamerge" -c:v qtrle output.mov [18:35:38 CET] <Hello71> qtrle? [18:36:22 CET] <stealthii> it's the Apple QuickTime RLE. there are other formats better for export that support alpha, this was just a test [18:48:34 CET] <rocktop> I have the problem with audio when I use this : ffmpeg -y -f concat -safe 0 -i 240p/steam.txt -c copy output.mp4 [18:48:41 CET] <rocktop> is there anyway to resolve this issue ? [18:52:09 CET] <rocktop> anyidea ? [18:59:39 CET] <friendofafriend> rocktop: Are you still working on afade with concat? [19:04:00 CET] <rocktop> friendofafriend: I am just trying to fix regular concat [19:05:13 CET] <rocktop> but doesn't work , I see the audio for final video is playing with high speed [19:05:30 CET] <rocktop> is not like original video [19:05:32 CET] <rocktop> how can I fix this ? [19:10:38 CET] <friendofafriend> rocktop: Do both videos have audio? [19:10:55 CET] <rocktop> yes [19:14:26 CET] <friendofafriend> rocktop: It would be helpful to see the output of an ffprobe -v verbose <filename> for each file in your concat list. Maybe to pastebin or http://paste.debian.org ? [19:20:24 CET] <rocktop> friendofafriend: https://bpaste.net/show/5HG2S [19:23:49 CET] <rocktop> friendofafriend: do you get it ? [19:25:14 CET] <klaxa> your audio tracks have different sample rate, i think you have to re-encode audio [19:25:25 CET] <klaxa> so it has the same sample rate [19:26:03 CET] <klaxa> it shouldn't be a "big loss" audio encoding is fairly fast and quality can be set to something good enough [23:46:44 CET] <friendofafriend> I want to grab one window with ffmpeg with x11grab (or anything else). Can it be done? [23:47:05 CET] <lavalike> I haven't been able to figure this out: if I play a twitch stream in mpv on macOS (via youtube-dl) it goes fine, I go on windows, same machine, and the streams give out ffmpeg decoding errors talking about blocks, they break, I can't find anything close to that by searching, any idea what it could be? [23:52:24 CET] <Hello71> friendofafriend: -s "$MON_WIDTH"x"$MON_HEIGHT" -i :0.0+"$MON_X","$MON_Y" [00:00:00 CET] --- Fri Nov 29 2019