[Ffmpeg-devel-irc] ffmpeg.log.20200123

[burek]

[02:40:51 CET] <kingsley> How do you tell version 1.7+ of libvpx to use multiple CPUs, and ideally, threads, to encode faster?
[02:50:22 CET] <Hello71> ... what?
[02:52:50 CET] <furq> -row-mt 1 -threads 8
[02:52:58 CET] <furq> and then cross your fingers because it probably still won't work very well
[02:59:37 CET] <kingsley> furq: Thank you. My testing is consistent with your suggestion.
[03:00:08 CET] <kingsley> I'll only add that it complained when I asked for more than 64 threads.
[03:21:38 CET] <SirNapkin1334> um, so, I updated my entire WSL installation, but now apt-get reports that the newest version of ffmpeg is 4.1!! better than 3.7, but still, does anyone know how to actually update?
[03:21:56 CET] <SirNapkin1334> i sudo do-release-upgraded to the latest version of ubuntu
[03:22:26 CET] <SirNapkin1334> but it still says it's on the latest version 4.1, whereas launchpad.net says newest is 4.2
[03:58:41 CET] <Deep6> hey guys wondering if I can get some assistance on an "emergency" from my wife? I have to concatenate a small mov onto the front of a corporate mp4 file...
[03:59:52 CET] <Deep6> I have tried a few things, converted the mov to an mp4, then concatenating, that seemed to work ok, except the audio was lost on the second video, ...googled that. turns out I needed to add a silent audio track...did that...
[03:59:59 CET] <Deep6> still no joy...
[04:00:53 CET] <Deep6> then upscaled the first video to the res of the second...and added the silent audio. no I get some sort of weird big gap between the files and then it's like the second is in fast forward
[04:41:35 CET] <SirNapkin1334> hi, where is the public log for this channe:/
[04:41:39 CET] <SirNapkin1334> *channel?
[04:43:48 CET] <Deep6> there's no one here SirNapkin1334
[04:43:50 CET] <Deep6> :(
[04:44:05 CET] <SirNapkin1334> wait but it says its publicly logged
[04:47:05 CET] <Deep6> yah, probably somewhere on the website it'll say where
[06:30:44 CET] <AlaskanEmily> So I want to write a .au file with 8-bit PCM in it. Specifying a .au output apparently defaults to using the signed 16-bit format, and using -sample_fmt u8 doesn't seem to work, it tells me that the PCM16 encoder can't do u8.
[06:49:26 CET] <furq> AlaskanEmily: -c:a pcm_s8
[06:50:05 CET] <AlaskanEmily> furq: Thanks!
[07:05:05 CET] <void09> anyone here that can help me try to figure out why ffmpeg selects a video  segment (encoding, not -copy) with 1 frame difference given the same -to time , but different -ss time ? 1 frame extra at the end of one of the encodes
[07:05:12 CET] <void09> ffmpeg -i "video.mkv" -ss 00:02:15.844 -to 00:02:16.845 -crf 0 short.mkv <-  ends up at the correct frame
[07:05:17 CET] <void09> ffmpeg -i "vide.mkv" -ss 00:01:59.619 -to 00:02:16.845 -crf 0 long.mkv <-  ends up at +1 frames
[14:48:41 CET] <danilo82> hello, i want to merge 2 audio files, one is for the right side and the second if for the left side, i want to merge but keep it lossless
[14:49:14 CET] <DHE> what do you mean keep it lossless? is it already lossless?
[14:49:26 CET] <danilo82> yes
[14:49:45 CET] <danilo82> rew file converted to wav
[14:49:53 CET] <danilo82> raw*
[14:50:39 CET] <DHE> ffmpeg -i left.wav -i right.wav -filter_complex amerge output.wav   # I think this will work
[14:51:17 CET] <danilo82> :P  but how can i know if it worked?
[14:51:35 CET] <DHE> I like to use ffprobe to see if the resulting wav is stereo.... or you know... play it
[14:53:20 CET] <danilo82> they are not stereo
[14:53:46 CET] <danilo82> no no
[14:53:55 CET] <danilo82> they are stereo
[14:54:10 CET] <DHE> then I will require a better description of what you want to accomplish
[14:55:56 CET] <danilo82> music from a game, the left file is created to be played in the left speaker and the right is made to be played in the right speaker, they are almost the same except for some details
[14:56:45 CET] <DHE> so merge both wavs to mono, then use each resulting mono channel as a speaker in a stereo config?
[14:58:44 CET] <danilo82> i want to merge the files because they only sound right if they are merged
[14:59:58 CET] <DHE> yes, but merging 2 stereo files produces 4 channels. how do you want that presented?
[15:00:30 CET] <DHE> mix left+left and mix right+right straight up like 2 wavs are playing simultaneously into your ears?
[15:02:56 CET] <danilo82> :/
[15:03:05 CET] <danilo82> but i think your first command worked
[15:03:57 CET] <danilo82> left file "Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 32000 Hz, 2 channels, s16, 1024 kb/s"
[15:04:17 CET] <danilo82> right file "Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 32000 Hz, 2 channels, s16, 1024 kb/s"
[15:04:53 CET] <danilo82> merged with your command "Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 32000 Hz, 4.0, s16, 2048 kb/s"
[15:05:35 CET] <pink_mist> that now has 4 audio channels
[15:05:39 CET] <danilo82> i see
[15:06:27 CET] <danilo82> so i should convert each file to mono first?
[15:17:11 CET] <danilo82> https://trac.ffmpeg.org/wiki/AudioChannelManipulation
[15:17:13 CET] <danilo82> there
[15:17:22 CET] <danilo82> 2 × stereo ’ stereo
[15:17:30 CET] <danilo82> will this work for me?
[15:42:32 CET] <cehoyos> Yes, but "this" are several different operations, only you can know which one is correct for your use case
[16:27:44 CET] <filpAM> can ffmpeg decode .exo chunks?
[16:28:27 CET] <JEEB> try just feeding whatever that is to ffprobe with `ffprobe -v verbose -i INPUT`
[16:28:40 CET] <JEEB> if it comes up with anything semi-sane, you could at least attempt
[16:31:54 CET] <filpAM> I am downloading some videos from youtube for my Mom. My mom had youtube premium so I downloaded them with it, but the videos aren't present in the smartphone download directory. I got pissed but then I checked the Android internal storage and figured where the downloaded videos are located. They happen to be divided into chunks with extension .v3.exo..
[16:32:44 CET] <JEEB> if it's DRM'd it's DRM'd and that's no longer within ffmpeg's area of expertise
[16:34:06 CET] <filpAM> such a bullshit
[16:35:17 CET] <JEEB> and if you just want to download normal videos from youtube, just use youtube-dl for it. probably if it's some premium DRM content it will not work, but at least the random cat videos will :P
[16:36:49 CET] <filpAM> JEEB: I tried to be ethic(because these videos are for mom church) but youtube isn't being back.
[17:03:43 CET] <void09> anyone here that can help me try to figure out why ffmpeg selects a video  segment (encoding, not -copy) with 1 frame difference given the same -to time , but different -ss time ? 1 frame extra at the end of one of the encodes
[17:10:44 CET] <pink_mist> I would presume it's simply floating point rounding errors
[18:30:54 CET] <void09> I thought of that too
[18:31:45 CET] <void09> as the video is 23.976fps
[18:33:14 CET] <void09> which is actually 23,976023976
[18:40:02 CET] <Hejkki> hello. I have a file from my camera that is corrupted. The battery died while recording. How can i fix the file with ffmpeg or some other tool? if i try ffmpeg -i damaged.MP4 out.mp4 it will only say Invalid data found when processing input
[18:40:30 CET] <Hejkki> the file size is about 2GB
[18:41:45 CET] <Hejkki> using Linux
[18:45:20 CET] <JEEB> most things unfortunately write globally indexed mp4
[18:45:35 CET] <JEEB> which means that unless you want to re-write the whole file, you need to write it at the end
[18:46:02 CET] <JEEB> unfortunately, that index also happens to include various content-related information
[18:46:21 CET] <JEEB> you can possibly fix it to a point if you already have some file with the exact same parameters, but working
[18:46:45 CET] <JEEB> ah, found the project https://github.com/ponchio/untrunc
[18:47:41 CET] <Hejkki> yes, i do have 2 files, one working and another not working
[18:48:37 CET] <Hejkki> will try that, thanks :)
[18:50:39 CET] <Hejkki> JEEB: it gives me track.cpp:57:11: error fatal: config.h: No existe el fichero o el directorio
[18:50:51 CET] <Hejkki> oh sorry, i have it in spanish,..
[18:50:53 CET] <Hejkki> sec
[18:51:05 CET] <JEEB> Hejkki: you probably need to actually read that project's documentation and build it :P
[18:51:38 CET] <Hejkki> i am building it
[18:51:44 CET] <Hejkki> the build process said like that
[18:51:54 CET] <Hejkki> track.cpp:57:11: fatal error: config.h: No such file or directory
[18:52:16 CET] <JEEB> yea, and clearly you need to go get support from that project since it is not FFmpeg (while it utilizes FFmpeg and I know of it)
[18:52:30 CET] <JEEB> unfortunately I have not built it myself nor have I used it :P
[18:52:37 CET] <JEEB> but it really sounds like you haven't read the documentation
[18:53:14 CET] <Hejkki> i have
[18:53:22 CET] <Hejkki> assholes in the internet all the day
[18:53:54 CET] <JEEB> heh, and I tried to say it without too much negativity :P
[18:54:08 CET] <JEEB> it just sounded like he hadn't configured the project, which I would hope is part of their build docs
[18:54:55 CET] <pink_mist> it isn't
[18:55:04 CET] <pink_mist> they suggest you just run a bare g++ command
[18:55:09 CET] <pink_mist> not even make
[18:55:49 CET] <JEEB> right
[21:10:56 CET] <snooky> hi all
[23:10:34 CET] <DrNefario> hey, how are you supposed to pronounce ffmpeg?
[23:11:30 CET] <furq> eff eff emm peg
[23:28:19 CET] <JEEB> äf äf ämpäri
[23:31:21 CET] <pink_mist> electronice frontier foundation electroic frontier foundation enterprise metadata manager pci express graphics
[23:46:14 CET] <DrNefario> oops i forgot i had this open
[23:46:59 CET] <DrNefario> i guess i was pronouncing it right, thanks
[00:00:00 CET] --- Fri Jan 24 2020