Re: [FFmpeg-user] How i can use vulkan hw accel and vulkan filters for streaming my desktop. Is KMS grab working with audio recording?

> hi, out of curiosity, why one would need to probe (with crazy 100M probesize) x11 capture and why to use 5.1 on 1080p@24 when 4.2 would be enough ? Because this is a generic script not limited to 1080p. That way I can use it for 4k as well what is not possible with level 4.2. Furthermore, with

Re: [FFmpeg-user] How i can use vulkan hw accel and vulkan filters for streaming my desktop. Is KMS grab working with audio recording?

I don't have vulkan here but that's what I use with QSV. Maybe it is an inspiration to you: ffmpeg -video_size "$resolution"\ ¦ ¦ -loglevel warning \ ¦ ¦ -probesize 100M \ ¦ ¦ -framerate 25 \ ¦ ¦ -thread_queue_size 1024 \ ¦ ¦ -init_hw_device

Re: [FFmpeg-user] Audio-Video Delay When Fetching From NGINX-RTMP

fer -flags low_delay rtmp://localhost/live` reacts almost instantly I suspect the issue not to be with nginx but the time-stamp handling of ffmpeg. Any suggestions are warmly welcomed! Thanks a lot! Stephan Am So., 8. Nov. 2020 um 21:46 Uhr schrieb Stephan Monecke : > > Good evening t

[FFmpeg-user] Audio-Video Delay When Fetching From NGINX-RTMP

Good evening together, I have another audio-sync question where we're out of ideas. We get an rtsp-Stream and mix it together with line-in over pulseaudio. This looks something like: ffmpeg \ -use_wallclock_as_timestamps 1 -fflags +genpts \ -max_delay 200 -thread_queue_size 1024

[FFmpeg-user] H264_QSV reference

Hi, does anyone know where I can find a complete command argument reference for the h264_qsv encoder? E.g. `-global_quality` as one of the main parameters is not present in `fmpeg -h encoder=h264_qsv`. Thanks a lot! Cheers, Stephan ___ ffmpeg-user

[FFmpeg-user] h264_qsv crashes in unknown circumstances with filter vpp_qsv

Good morning, yesterday evening, the following command crashed (allways but once!) with [Parsed_vpp_qsv_2 @ 0x563c3523f780] Can't allocate a surface as long as the vpp_qsv filter was present: ffmpeg -init_hw_device qsv=hw -filter_hw_device hw -i 'rtsp://url' -vf

Re: [FFmpeg-user] Audio-Video Synchronization and Fastest Encoding

\ -f flv outfile.flv Thanks a lot! Am Do., 4. Juni 2020 um 17:11 Uhr schrieb Stephan Monecke : > > Hi together, > > > I have a weak computer (i3 something) connected to a HDMI-grabber > (Magewell USB Capture HDMI PLUS, acts like a webcam) and audio via > line o

[FFmpeg-user] Audio-Video Synchronization and Fastest Encoding

Hi together, I have a weak computer (i3 something) connected to a HDMI-grabber (Magewell USB Capture HDMI PLUS, acts like a webcam) and audio via line over the microphone port. I want to merge those two streams together with as little audio-video offset as possible and as light as possible on

Re: [FFmpeg-user] Captured Audio Stream and Video Streams from YouTube Live are out of Sync

Have a look at the "-itsoffset" parameter for constant delays. Also you might want to drop the "-re" [1]. [1] https://trac.ffmpeg.org/wiki/StreamingGuide#The-reflag Best regards, Stephan Monecke -- Sent from my mobile device. Please excuse my brevity. Am 9. Mai 2020 09:14

Re: [FFmpeg-user] change inputs or mapping while recording

ly segfaults for me with a freshly compiled ffmpeg. Am Mo., 27. Apr. 2020 um 20:50 Uhr schrieb Stephan Monecke : > > That looks really interesting! Thanks a lot, I'll have a look at it! > > Besides daily checking, I managed to overlook ALL the replies ... sorry for > my late answer a

Re: [FFmpeg-user] change inputs or mapping while recording

). They are present in abundance at the institute and the setup is practically free of cpu usage even on this weak machine. That way, the lecturer can switch between blackboards / cameras and fully control the procedure just via the presenter. Best regards, Stephan Monecke -- Sent from my mobile

[FFmpeg-user] change inputs or mapping while recording

Hey! I have two identical rtsp video-sources stream1, stream2 and an audio source. I currently merge stream1 with the audio for a rtmp-server using: stream1="rtsp://streamurl1" /usr/bin/ffmpeg\ [...] -i "$stream1" \ [...] -itsoffset