#ffmpeg on 2024-09-29 — irc logs at libera.irclog.whitequark.org

2024-04-11 19:01 BtbN 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 7.0 is released

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13:01 <iconoclasthero> i have a video I wish to watch on my firestick hd via kodi served up by minidlnad. i tried watching it last night and it stalled out. i will not be keeping this video after i watch it so i do not care about the file size (within reason), i just want to be able to watch it with minimum quality loss.

13:01 <iconoclasthero> i don't want to get involved dlna server transcoding right now, i'm just looking for an efficient way to transcode this video to something that will play. the fastest transcoding with minimum quality loss irrespective of file size are probably the goals.

13:01 <iconoclasthero> in looking at https://trac.ffmpeg.org/wiki/Encode/H.265 i wonder if maybe the lossless option is right for this task?

13:01 <iconoclasthero> or of x265 is even the right tool for the job

13:01 <iconoclasthero> ffplay out: https://bpa.st/SPEY6

13:01 <iconoclasthero> s/ffplay/ffprobe

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15:03 <DeHackEd> iconoclasthero: for fast transcoding but high compatibility with little regard for bitrate, you can probably do something like: ffmpeg -i input.mp4 -c:a copy -c:v libx264 -qp 10 -preset:v veryfast output.mp4

15:03 <DeHackEd> it's not lossless - qp value of 10 has some loss, but it will be quite low while still providing some compression

15:04 <DeHackEd> you might replace that with -crf 10 instead if it's an action movie with lots of highspeed scenes, explosions and stuff...

15:09 <iconoclasthero> i did some messing around and it seems like there's some issue with kodi and the aspect ratio as well. if i can't streamcode to a new aspect ratio (and it seems i can't?) and I use your code, then would this force the aspect ratio as well:

15:10 <iconoclasthero> `-vf "scale=1920:-1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2"`

15:11 <furq> you can change the aspect ratio without reencoding

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15:11 <furq> -aspect sets it in the container and -bsf:v h264_metadata=sample_aspect_ratio sets it in the stream

15:11 <iconoclasthero> oh good, i want to see if that's the problem!

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15:19 <iconoclasthero> furq: [h264_metadata_bsf @ 0x61780f6b51c0] [Eval @ 0x7ffd4d81bc60] Undefined constant or missing '(' in 'sample_aspect_ratio' ?

15:22 <Marth64> furq gave the base syntax and an example, you need to set sample_aspect_ratio with a value

15:23 <Marth64> see the doc for example

15:23 <Marth64> for example you can add =(4/3) at the end

15:25 <iconoclasthero> oops, thanks!

15:26 <Marth64> have fun

15:27 <Marth64> some bsf settings for h264_metadata and mpeg2_metadata do not have an obvious value you may need to get it from the spec

15:27 <Marth64> sar should take an ordinary rational though

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15:34 <iconoclasthero> ok thanks, i'll puzzle it out from here hopefully. i'm honestly not even sure if this is where the problem is so it's kinda basic research at the moment, lol

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15:37 <Marth64> if your issue is stalling i would look at other factors

15:38 <Marth64> what is the network connection like? do you need to use dlna? is the decoder chip on your set top box weak, buggy, or too old?

15:38 <Marth64> (rhetorical questions but i would look at those factors)

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15:48 <Marth64> if it's a one and done video, sometimes putting it on the flash drive and if your tv has usb port could work

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22:59 <znf> Is there any way to figure out what defaults changed for nvenc between 2 specific ffmpeg commits, without doing a bisect and going crazy on it?

23:01 <znf> I'm doing some live-tv transcoding and burning dvb_subtitles on the video `N-105688-g0d34e21282` uses about ~250-270MiB VRAM per channel

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23:01 <znf> the same exact command line, but with `N-113745-gcb9f1f59a1`, uses about ~450-470MiB, which is a big difference

23:02 <znf> I realized I kinda want/need a newer ffmpeg, for `-readrate_initial_burst`, which the old one doesn't have it

23:40 <znf> Oh. That's weird. 7.0.x doesn't have the excessive vram usage

23:40 <znf> yay me