[05:55:02 CEST] <Lac3rat3d> Is there an ffmpeg API? If so, what language(s) does it interface with? Is there a basic tutorial? [08:55:14 CEST] <BtbN> Depends on what you mean by ffmpeg api. There is no api to interface with the ffmpeg cli tool. But the ffmpeg tool just uses the libav* libraries itself. [09:36:27 CEST] <chungy> he didn't wait around for an answer [09:43:08 CEST] <chama> can some one help me to calculate color values for colorchannelmixer [09:43:11 CEST] <chama> ?? [09:43:56 CEST] <chama> I need to implement Willow effect on the following url using ffmpeg [09:43:58 CEST] <chama> http://designpieces.com/2014/09/instagram-filters-css3-effects/ [09:44:08 CEST] <chama> any idea? [10:26:29 CEST] Action: _DragonsLordKERN is back (gone 171:45:21) [10:31:00 CEST] <durandal_1707> chama: look in hex editor values of colors of raw picture [11:38:07 CEST] <nicki> Anyone know how to solve this error in iOS. "codec not found: h264" . I'm using ffmpeg C API [13:04:58 CEST] <layosvoncyber> Hi Guys, I'm building a script that zoomout from a picture. The problem is that picture is not in the center of the screen [13:05:01 CEST] <layosvoncyber> ffmpeg -loop 1 -i test.png -frames:v 300 -vf "zoompan=z='if(lte(zoom,1.0),6.5,max(1.001,zoom-0.05))':d=125:x=-1000:y=-1000" -pix_fmt rgba -vcodec png LOGO.MOV [13:06:28 CEST] <layosvoncyber> so I'm looking for a solution to minimalise the picture in place [13:11:06 CEST] <layosvoncyber> this is how it looks now: https://www.dropbox.com/s/r6u7eg77biznynt/LOGO.MOV?dl=0 [13:16:17 CEST] <dexter_> Hey guys, can ffmpeg be acclerated with Intel Haswell under linux? [14:21:33 CEST] <chama> hi, how to adjust brightness, contrast, etc. with colorchannelmixer? [15:00:00 CEST] <randomdue> [12:06:26] <layosvoncyber> so I'm looking for a solution to minimalise the picture in place [15:00:17 CEST] <randomdue> crop the video around the image [15:00:26 CEST] <randomdue> then process the result with your script [15:04:17 CEST] <layosvoncyber> <randomdue>, well it is a transparent png basicly [15:13:37 CEST] <feliwir> hey, not sure if this the right place to ask, but where can i find libvp62? I know ffmpeg used that as a resource for their vp6 decoder, but i can't find it on the web [15:15:06 CEST] <Hfuy> Hello. I have a lot of files like the one listed by ffmpeg -i here: http://pastebin.com/exDuFu7q [15:15:17 CEST] <Hfuy> fuy> There are four 24-bit, 48KHz audio channels. The useful audio is inthe second two (VLC plays silence, I suspect it's playing the first two). I'd like to end upwith the same image data, but with the second two tracks as the stereo audio, and at 16-bit. Can ffmpeg do that? [15:15:53 CEST] <hardikj> hi, I am trying to record my screen using ffmpeg on a window machine with a very low configuration (1core, 2 GB ram). I want to record some CPU intensive work like browser test and ffmpeg seems to be consuming lot of CPU [15:16:25 CEST] <hardikj> ffmpeg -rtbufsize 1500M -framerate 8 -f gdigrab -threads 0 -i desktop -vcodec libx264 -preset ultrafast -g 60 -maxrate 2000k -bufsize 2000k -crf 40 out.mp4 [15:16:35 CEST] <hardikj> ^this the command I am using right now [15:16:51 CEST] <Hfuy> hardikj: Define "a lot". H.264 is not an easy thing to create. [15:17:27 CEST] <hardikj> Hfuy, hi, I don't need a very high res vid just a normal video, can you suggest alternative? [15:17:37 CEST] <Hfuy> mjpeg is less work. [15:17:40 CEST] <feliwir> hardikj: screen capturing uses a fair amount of cpu, what did you expect? [15:19:12 CEST] <hardikj> feliwir, I just wanted to know lowest possible cpu I can consume, becausecause right it seems to take 30-35% CPU and with selenium test running everything hangs [15:19:33 CEST] <hardikj> Hfuy, I will try mjpeg thanks [15:19:55 CEST] <hardikj> anything else I can change to improve the CPU usage? [15:20:48 CEST] <feliwir> use your gpu for screen capturing [15:21:02 CEST] <feliwir> or get yourself a gpu that supports that :) [15:21:57 CEST] <hardikj> feliwir, hehe, the use case is to record selenium test on 100s of machines [15:22:04 CEST] <hardikj> I can afford gpu :( [15:23:07 CEST] <hardikj> Is there any format I can use which consume lowest CPU ? [15:23:16 CEST] <Hfuy> As feliwir says, screen capturing may never be a very low CPU job. [15:23:25 CEST] <Hfuy> That said, if you are not sensitive to disk space usage, you can record it uncompressed :) [15:23:43 CEST] <feliwir> ah. Can someone please answer my question from earlier? [15:25:48 CEST] <Hfuy> What's the question? [15:26:24 CEST] <feliwir> i asked, where i can find libvp62 [15:26:46 CEST] <Hfuy> Absolutely no idea. [15:26:53 CEST] <feliwir> since ffmpeg used that as reference for their vp6 decoder someone might still have a download link [15:26:59 CEST] <Hfuy> What would the -c:a entry for uncompressed 16-bit 48KHz be [15:28:01 CEST] <Hfuy> Apparently, "pcm_s16le" [15:28:38 CEST] <randomdue> i would just leave the audio alone [15:28:42 CEST] <randomdue> re mux it [15:29:21 CEST] <Hfuy> This audio is just an on-camera mic. I really only need it as a guide. [15:29:31 CEST] <Hfuy> I'd like to avoid recompressing the video but it seems to cause problems if I don't. [15:32:44 CEST] <hardikj> Hfuy, actually, I wanted to upload the video to s3 in parallel, so that is not an option [15:33:50 CEST] <Hfuy> s3? [15:36:54 CEST] <hardikj> amazon web services, S3 storage [15:37:03 CEST] <Hfuy> Hmm, I see. [15:37:15 CEST] <Hfuy> Well, you might need a little bit more power, then. [15:37:57 CEST] <hardikj> Hfuy, just one last time, are sure this is sane [15:37:58 CEST] <hardikj> ffmpeg -rtbufsize 1500M -framerate 8 -f gdigrab -threads 0 -i desktop -vcodec libx264 -preset ultrafast -g 60 -maxrate 2000k -bufsize 2000k -crf 40 out.mp4 [15:38:17 CEST] <hardikj> a low quality video would do to :) [15:38:18 CEST] <Hfuy> I'm not an expert. [15:38:21 CEST] <Hfuy> Sorry. [15:38:48 CEST] <kepstin> that would be really low quality, and if you really want fast encoding it's probably best to drop the vbv controls (-maxrate, -bufsize) [15:39:03 CEST] <kepstin> although if you're streaming live i guess they make sense [15:41:01 CEST] <hardikj> kepstin, I am not streaming live, but I have a script that will push some chunks from file say 5mb to S3 [15:41:24 CEST] <hardikj> so I have few more sec after the recording is stopped [15:44:59 CEST] <guestfwc> hello all i want to use ffmped to convert video from 3gp to webm , what command i use to do this please ? [15:52:39 CEST] <hardikj> Hfuy, mjpeg to gives me lots of rc buffer underflow [15:52:45 CEST] <hardikj> any idea? [16:51:50 CEST] <relaxed> Hfuy: pcm_s16be [16:52:21 CEST] <relaxed> oh, nevermind, I thought you meant big-endian [16:53:50 CEST] <relaxed> guestfwc: https://trac.ffmpeg.org/wiki/Encode/VP8 [16:53:53 CEST] <hardikj> relaxed, any idea about my issue? basically reducing cpu usage? [16:55:03 CEST] <relaxed> try -threads 1 [16:55:22 CEST] <guestfwc> relaxed: ok thank you [16:56:55 CEST] <relaxed> hardikj: hmm, you have one core [16:59:32 CEST] <Fyr> guys, if I have a list of files in the directory, how to make them normalize during batch conversion? [17:01:25 CEST] <hardikj> relaxed, yup :( [17:02:59 CEST] <codechelvetica> if I tell ffmpeg to extract a frame as a .yuv file from a .yuv video [17:03:09 CEST] <codechelvetica> will the file have the same pixel format as the video? [17:03:15 CEST] <codechelvetica> say yuv420p [17:03:49 CEST] <codechelvetica> I know the video is planar yuv420, and I need a yuv frame representing the single luminance plane and the two chrominance half planes [17:03:54 CEST] <codechelvetica> etc [17:05:57 CEST] <klaxa> if you use codec copy, probably [17:06:27 CEST] <klaxa> like: ffmpeg -i input.yuv -ss 12.345 -c copy -vframes 1 output.yuv [17:19:02 CEST] <Fyr> guys, where can I find manual on lpc_passes or lpc_method and so on? [17:43:25 CEST] <Fyr> how to strip off all metadata from file? [17:43:39 CEST] <Fyr> even wav contains some of it. [17:47:43 CEST] <feliwir> did anyone found an answer to my question earlier today? [17:58:08 CEST] <Kolizer> Kappa [18:56:31 CEST] <feliwir> well i just reask my question: Does someone know where i can get libvp62? I can't find any download link [18:58:27 CEST] <Fyr> in Linux you can look through repositories [18:59:21 CEST] <feliwir> as far as i know the library was only available for a short time for download, since On2 did hire some lawyers against it [18:59:29 CEST] <Fyr> and download source package and compile it in Windows/Linux/MacOS. [19:00:28 CEST] <feliwir> Fyr: it's not in any repository [19:01:02 CEST] <Fyr> agreed [19:01:46 CEST] <feliwir> but since the ffmpeg vp6 codec is based on it i thought someone might still have it [19:36:03 CEST] <DRAWNBOX> Does anyone know how to reencode a file? [19:38:02 CEST] <klaxa> can you be more specific? [19:38:51 CEST] <klaxa> it can be as simple as: ffmpeg -i input.mp4 output.mp4 [19:39:04 CEST] <DRAWNBOX> I have a file and have no clue how its encoded and want to make it h264 [19:39:32 CEST] <DRAWNBOX> I just dont know what I am supposed to put to make it do hs64 [19:39:40 CEST] <DRAWNBOX> h.264* [19:40:18 CEST] <klaxa> an elaborate guide is here: https://trac.ffmpeg.org/wiki/Encode/H.264 [19:40:43 CEST] <klaxa> you don't really have to worry about the input, if ffmpeg can read it, it will detect it automatically [19:41:01 CEST] <DRAWNBOX> Thanks, im pretty sure thats what I needed [19:50:26 CEST] <DRAWNBOX> Do you know the one option so that non ffmpeg players can use it? [19:50:49 CEST] <DRAWNBOX> klaxa [19:53:51 CEST] <klaxa> huh? it should be compatible by default [19:54:10 CEST] <klaxa> are you having problems? you can encode short samples using -t 10 to encode 10 seconds and then check with players [19:55:26 CEST] <DRAWNBOX> It only works with the video players I downloaded [19:55:36 CEST] <DRAWNBOX> The video editor I am using doesnt though [19:55:59 CEST] <klaxa> have you read https://trac.ffmpeg.org/wiki/Encode/H.264#Encodingfordumbplayers ? [19:56:53 CEST] <DRAWNBOX> Nope [19:56:57 CEST] <DRAWNBOX> I am gonna try that now [21:30:23 CEST] <anoop_r> does ffmpeg support qaac ? [21:45:16 CEST] <Fyr> no [22:03:21 CEST] <DrBotato> is there a way to restrict ffmpeg to not use all cores? i want to prevent it from slowing down other tasks that might run while it is running. [22:04:11 CEST] <chungy> -threads 1 [22:04:33 CEST] <DrBotato> excellent! thanks [22:25:11 CEST] <mbullington> Hello. [22:25:22 CEST] <mbullington> I'm currently writing an RTSP client in node.js. [22:26:10 CEST] <mbullington> And I was wondering, if using RTP/AVP/TCP, if I get the RTP packet from that, is there any way to use ffmpeg to parse the RTP packet and encode it? [22:27:57 CEST] <Fyr> guys, why does volume amplification increase filesize? [22:58:21 CEST] <iive> Fyr: are you sure this is the only thing you do? [22:59:00 CEST] <iive> e.g. -c:v copy should copy the video. audio is usually with fixed bitrate, -b:a 128k ... [23:55:03 CEST] <fortruce> When i capture a window on the screen with gdidraw it only shows a still of the screen with my mouse movements accurately recorded on top of it [23:55:11 CEST] <fortruce> does anyone have any idea why that might be? [23:58:52 CEST] <fortruce> it captures correctly for other windows with the exact same command (except for the title) [00:00:00 CEST] --- Sat Jun 13 2015