[01:43:16 CET] <Soni> how do I use ffmpeg to mix multiple audio files together? [01:43:22 CET] <Soni> at different positions [01:43:27 CET] <Soni> y'know, like an audacity project [01:43:34 CET] <Soni> can ffmpeg do that? [01:44:00 CET] <Soni> can ffmpeg read stuff from a file? [01:44:20 CET] <Soni> (commands etc) [04:33:38 CET] <raytiley> is there a way to take something like `-vf scale=w=640:h=360:force_original_aspect_ratio=decrease` and make it round to even pixels? [04:47:23 CET] <furq> raytiley: scale=640:-2 or scale=-2:360 [04:47:48 CET] <furq> or if you need to handle any AR, scale="if(gt(a\,16/9)\,640\,-2):if(gt(a\,16/9)\,-2\,360)" [04:48:42 CET] <raytiley> furq: thanks, just stumbled on that [11:20:23 CET] <dv_> hmm what parts of a video codec benefit most from hw acceleration on embedded devices? [11:20:34 CET] <Mavrik> All of them? :) [11:20:43 CET] <Mavrik> It's usually a full decoding / encoding block on the SoC [11:20:51 CET] <dv_> I mean, assume that you have a hw codec whose driver is fully open source, so you can access all of the hardware's facilities. [11:21:10 CET] <Mavrik> You're assuming that the pipeline is programmable. [11:21:11 CET] <dv_> isnt the hardware usually made up of units that do individual steps, like DCT, motion compensation, deblocking etc.? [11:21:18 CET] <Mavrik> But it's usually a hardwired block that does a full decode [11:21:20 CET] <Mavrik> And a full encode [11:21:47 CET] <Mavrik> Which is configurable to some extent but not really programmable [11:22:05 CET] <JEEB> at some point intel noted that they might open up APIs for specific parts of H.264, but then that person was mysteriously vanished, never to be seen again [11:28:07 CET] <dv_> hmm [11:28:15 CET] <dv_> Mavrik: ever seen anything about Hantro hw codecs? [13:52:20 CET] <alonex> . [13:52:56 CET] <alonex> Hello, any one know right syntax of QSV h264 encoding? [14:18:43 CET] <alonex> i want to use ffmpeg for screen capturing with QSV instead h264 lossless, but i can't. With bandicam qsv working. [14:20:30 CET] <JEEB> pretty sure QSV doesn't support lossless H.264? [14:22:10 CET] <alonex> hello jeeb, i guess qsv does not supporting lossless with h264, but with bandicam i use 100% of quolity with 5 frames per second rate [14:22:24 CET] <alonex> and h264 with QSV - it's ok. [14:22:33 CET] <alonex> CPU almost iddle [14:22:44 CET] <alonex> but i want my lovely ffmpeg for that [14:57:28 CET] <alonex> . [14:57:39 CET] <alonex> Jeeb u here? [14:57:56 CET] <alonex> hello jeeb, i guess qsv does not supporting lossless with h264, but with bandicam i use 100% of quolity with 5 frames per second rate [14:58:02 CET] <alonex> and h264 with QSV - it's ok. [14:58:05 CET] <alonex> but i want my lovely ffmpeg for that [18:15:10 CET] <brimestone> Hello everyone.. I'm getting an issue when transcoding an XDCAM proxy into mp4 where the resulting mp4 has a few seconds of repeated last frame. [21:14:19 CET] <petecouture> Has anyone run into an issue of coverting a webcam -> wowza recorded flv1 video to mp4 using FFMPEG. And during the process theres a timing issue where 3 minutes are stretched out into 40 minutes? Like suddenly the video and audio slow down to 1/16 speed. [21:14:37 CET] <petecouture> Its a 5 minute recording and the first minute and last minute play fine. [21:18:55 CET] <djk> I had an ffmpeg setup to stream to facebook at 720 unfortunately lost the that working configuration. The stream I have setup now Facebook only show 480 as the highest option. any suggestions? https://pastebin.com/dQfRbSVC [21:19:21 CET] <JEEB> note: you don't need 44.1kHz unless Facebook requires that [21:19:44 CET] <JEEB> post the full log for that? [21:19:47 CET] <JEEB> on a pastebin [21:19:49 CET] <JEEB> and link [21:19:59 CET] <JEEB> because that looks as if you're setting 1280x720 and then not scaling [21:20:05 CET] <JEEB> so if something's doing something, it's facebook :P [21:20:36 CET] <djk> JEEB: so it looks right to you? [21:21:25 CET] <djk> and the 44.1 I recall is Facebook requirement have to double check. It is silent anyway [21:21:33 CET] <JEEB> can't say anything from just the command, but if you look at the log and it clearly encodes 720p then you can only ask facebook [21:21:46 CET] <JEEB> yea facebook might be requiring it due to a stupid wording in the FLV spec :P [21:21:49 CET] <JEEB> the spec literally says [21:21:57 CET] <djk> https://www.facebook.com/BRPCwebcam [21:22:06 CET] <JEEB> "for AAC we want 44.1kHz as the value written in the FLV header" [21:22:12 CET] <JEEB> and then the next sentence [21:22:22 CET] <JEEB> "we will promptly ignore this value in players and trust the AAC stream instead" [21:22:29 CET] <djk> that is the live stream. [21:22:37 CET] <JEEB> cue over 9000 vendors which limited AAC to 44.1kHz :P [21:22:40 CET] <JEEB> (and stereo) [21:22:55 CET] <atomnuker> JEEB: so the aac samplerate? [21:22:55 CET] <JEEB> even though the spec says "we promptly ignore these two values and trust the AAC stream" [21:23:06 CET] <JEEB> atomnuker: yes, AAC configuration [21:23:11 CET] <atomnuker> lul [21:23:12 CET] <JEEB> as yoü'd expect [21:23:31 CET] <JEEB> only the FLV header contains the pre-defined values (stereo, 44.1kHz) [21:23:52 CET] <JEEB> but yea, that's why all those video services with FLV ended up with 44.1kHz AAC [21:23:59 CET] <JEEB> because they skipped the second sentence [21:24:12 CET] <djk> :-/ [21:26:11 CET] <djk> JEEB: what else do you need or does what I have setup look right? [21:26:58 CET] <JEEB> I have no idea what *facebook* needs [21:27:00 CET] <djk> JEEB: and it is just Facebook messing with the stream making 480 the best view [21:27:11 CET] <JEEB> if you see in your log that the encoded resolution is 720p [21:27:11 CET] <petecouture> Ive figured out the answer to my question. If anyone else runs into this legacy issue with Flash -> Wowza. The video was recorded with a variable framerate which players handle differently from flv to mp4 when you re-encode it. Most players keep th einitial framerate and then adjust the playback speed to match any variences. The key to fixing it is to define a flat rate or -r 30 when youre reencoding from flv to mp4 [21:27:27 CET] <JEEB> atomnuker: https://wwwimages2.adobe.com/content/dam/acom/en/devnet/flv/video_file_forma... [21:27:30 CET] <JEEB> page 71 [21:27:37 CET] <JEEB> fourth paragraph [21:28:15 CET] <djk> JEEB: https://www.facebook.com/help/publisher/162540111070395?helpref=page_content [21:28:16 CET] <JEEB> petecouture: if the timestamps make sense it should be remuxable [21:41:03 CET] <djk> JEEB: I updated the with the nohup.out log https://pastebin.com/dQfRbSVC [22:43:53 CET] <alonex> i want to use ffmpeg for screen capturing with QSV instead h264 lossless, but i can't. With bandicam qsv working. [22:44:06 CET] <alonex> Hello, any one know right syntax of QSV h264 encoding? [00:00:00 CET] --- Sat Dec 8 2018