#ffmpeg on 2025-08-26 — irc logs at libera.catirclogs.org

2025-03-03 01:06 ChanServ 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 7.1.1 is released

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11:41 <Guest85> Hello, I'm trying to make an overlay on a video through sendcmd, with 2 data files. I'm then trying to insert them like this `sendcmd=f=speed_gps.txt`. Problem is when I include 2 of these files, only one gets rendered. Content of them is kinda similiar like

11:41 <Guest85> - 0.0 drawtext reinit text=--\:x=50\:y=1850\:fontsize=128\:fontcolor=white;

11:41 <Guest85> - 0.0 drawtext reinit text=37\ km/h\:x=1625\:y=1850\:fontsize=128\:fontcolor=white;

11:41 <Guest85> I couldn't find anything relatable on google when solving this issue, so either I'm asking wrong or I'm trying to solve the problem in the wrong way (both can be true lol). I didn't had any luck with documentation either, so maybe I'm indeed trying to solve it wrong. These files include text, which should be rendered at some point in the video, and

11:41 <Guest85> are generated from GPS data from my application. To be precise they're updating every tenth of a second. I've also tried to merge the files into one using same timestamp so e.g.

11:41 <Guest85> 0.0 drawtext reinit text=--\:x=50\:y=1850\:fontsize=128\:fontcolor=white, drawtext reinit text=37\ km/h\:x=1625\:y=1850\:fontsize=128\:fontcolor=white;

11:41 <Guest85> (I've also tried it without reinit). Can someone point me in the right direction at what should I look at or how to make this work? In the future there will be even more data coming to overlay, so trying to solve it in some clever way. This is how I try to include the files in ffmpeg command, it's through filter-complex

11:41 <Guest85> [text5]sendcmd=f=speed_gps.txt[text6];\

11:41 <Guest85> [text6]sendcmd=f=gps_laptime.txt[text7]" \

11:41 <Guest85> Any help will be appreciated. (Sorry if this is wrong place to ask, I got here through the website, and checked history if people are asking similiar questions so hope it's okay).

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13:08 <losth1ghway> hey there, im trying to cut a segment of a longer video to upload to instagram. it seems to cut fine on my computer, however when i transfer it to my phone if i play the clip from the first frame the image freezes for about 3 seconds before playing like normal. if i avoid the first frame it seems to play fine.

13:09 <losth1ghway> ffmpeg -ss 00:01:45 -i input.mp4 -to 00:02:45 -c copy cut.mp4

13:09 <losth1ghway> that'

13:09 <losth1ghway> s the command im using to cut.

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15:37 <losth1ghway> ok, oddly enough they turned out fine when uploading

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18:04 <mishehu> greets folks. I'm trying to work with ffmpeg 7.1 1b48158a23 with svt-av1 3.1.2, & am seeking some guidance. I've done a bunch of conversions using libaom-av1, so I'm trying make sense of the differences between the 2. do the CRF values align between both projects, such that -crf 23 in aom is equivalent to -crf 23 in svt-av1?

18:04 <another|> No

18:09 <JEEB> each encoder has their own definition of that, and what the person writing the wrapper in FFmpeg's libavcodec decided to map that crf option to

18:10 <JEEB> heck, even within a single encoder various encoding options affect the result from a specific crf value :)

18:10 <JEEB> (this is why going slower and slower presets in x264 at some point generally starts leading to larger file sizes for the same CRF value)

18:10 <JEEB> since the algorithms start "seeing" more

18:10 <mishehu> And I seem to be having difficulty with film grain. using aom, setting -denoise-noise-level to various values results in differences in size of the output & noticable differences in film grain. but with svt-av1, I seem to have to pass them with -svtav1-params "film-grain=XX,film-grain-denoise=Y". I seem to end up with the same sized output no matter the combination of values for XX (0-50) and Y (0 or

18:11 <mishehu> 1). Does the film grain denoising not result in smaller output w/svt-av1?

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18:11 <mishehu> JEEB: that is interesting, I didn't know that about x264 slower presets

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18:12 <JEEB> I would expect that matches various encoders, since rate control generally is affected by various encoding parameters

18:13 <JEEB> if you then actually match the file size, I'd expect the result is better, but the CRF value (result) definition changes due to analysis etc things changing

18:14 <JEEB> that is why when I explain this stuff, you first pick the slowest preset that you can take. then you start adjusting CRF

18:15 <mishehu> it's very hard to tell. the source material is from Mel Brook's "Young Frankenstein" (h264 source, from my bluray). using a 1 minute segment from it for testing. The movie was done both b&w and has a good amount of film grain.

18:15 <mishehu> JEEB: that sounds like a good potential strategy.

18:15 <JEEB> (first with a 90 or 120 second part with `-t SECONDS`, and then when you finish tweaking with a relevant enough part of the clip)

18:15 <mishehu> yeah -ss at a few min in and -to 1 minute later, so that I'm not just working on the opening titles heh.

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