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• ffmpeg with cuda and concat videos [closed]

  15 septembre 2024, par Petr Šimůnek

  I have a ffmpeg command with nvidia hw support that I want to join two videos :

  


  /home/videotest/ffmpeg-dev/ffmpeg -benchmark -hide_banner -loglevel warning -y -hwaccel_device 0 -hwaccel cuda -hwaccel_output_format cuda -i /mnt/video-storage/test/cuda/surfing/intermediate1.mp4 -i /mnt/video-storage/test/cuda/surfing/intermediate2. mp4 -filter_complex 'hwupload_cuda,[0:v:0][0:a:0][1:v:0][1:a:0]concat=n=2:v=1:a=1 [outv] [outa]' -map [outv] -map [outa] -pix_fmt yuv420p -c:v h264_nvenc -preset p6 -profile: v high -force_key_frames 'expr:gte(t,n_forced*5)' -bf 0 -movflags +faststart -b:v 3000k -maxrate 4000k /mnt/video-storage/test/cuda/surfing/game.mp4

  


  I get an error message after starting :

  


  Impossible to convert between the formats supported by the filter 'graph 0 input from stream 0:0' and the filter 'auto_scale_0' [fc#0 @ 0x61ae2b37a1c0] Error reinitializing filters!

  


  I can't figure out how to remove it. Can you help me ? Thank you.

  


  If I use nvdec/nvenc instead of cuda, this error does not appear and the video is created fine.

  


• Loop a song for a certain amount of time using FFMPEG

  10 avril 2017, par Eduardo Perez

  So, I am trying to loop a song from a video game for one hour, using FFMPEG on Linux or in Windows 10 Bash. I have 3 versions of the song, they are as follows :

  1.Full song in OGG format with LOOPSTART and LOOPLENGTH metadata.
  
  2.Same song in OGG format, except only the segment before LOOPSTART.
  
  3.Same song in OGG format, except only the segment from LOOPSTART to LOOPSTART+LOOPLENGTH.

  So, what I want to do is use either the full song file for the loop, which I don’t think FFMPEG supports, or use the files for the beginning and looping portions of the song. Basically, I want to have FFMPEG create a song which starts off with the beginning segment of the song and loops the looping segment indefinitely until an hour has been played. If possible, I also want a second command so I can add an image or an MP4 video to be shown in a loop while the song is being played, but in the case of a video being used to be shown while the song is played, the music from that video won’t be merged with the music from the song. What command should I use for this ?

• Capturing video over USB/HDMI/Thunderbolt

  12 novembre 2016, par Yatko

  Looking for a solution for capturing video over USB/HDMI/Thunderbolt from a digital output (e.g. digital camera) to a computer, Mac and/or Windows.

  The goal is to have an URL to a real-time video stream (e.g. IP/PATH/ ?.mp4) that we can further process/transcode/send to a media server.

  I’m looking for tips and ideas -similar to the method below-, maybe someone met a new project that’s focusing on capture-cards and devices, that does’n need a custom FFmpeg build. Something different.

  • we can capture the HDMI stream form a GoPro, using a Blackmagic Intensity Shuttle and DeckLink SDK with custom FFmpeg build using --extra-cflags and --extra-ldflags and the rest is straightforward

  Is there any tool, open-source project, something that’s made for this purpose ? Maybe something that also supports the Elgato Game Capture HD60 as well ? Any experimental projects for capturing and processing the incoming video over USB/HDMI/Thunderbolt ?

  The ultimate goal is live streaming to Wowza, using Cameleon live and a Sony Alpha a7S.