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• Video ; Zoom to different points with a single render (?)

  31 mai 2021, par RewossKy

  Based on 16 seconds, I want the codes to zoom to the top left for the first 4 seconds, to the bottom left for the next 4 seconds, to the top right for the next 4 seconds, and then to the bottom right for 4 seconds.

  


  Structurally, the codes are ready, but I need small details, I want to render them in one go (without rendering 4 times) and focus every 4 seconds elsewhere.

  


  If you can help me I would be very happy. I couldn't figure it out for days.

  


  'Top left
ffmpeg -y -i input.mp4 -vf "zoompan=z='if(lte(mod(time,16),4),2,1.05)':d=1:x=iw/3-(iw/zoom/2):y=ih/3-(ih/zoom/2):fps=29.97" output.mp4

  


  Top right
ffmpeg -y -i input.mp4 -vf "zoompan=z='if(lte(mod(time,16),4),2,1.05)':d=1:x=iw/1-(iw/zoom/2):y=ih/3-(ih/zoom/2):fps=29.97" output.mp4

  


  Bottom left
ffmpeg -y -i input.mp4 -vf "zoompan=z='if(lte(mod(time,16),4),2,1.05)':d=1:x=iw/2-(iw/zoom/1):y=ih/1-(ih/zoom/1):fps=29.97" output.mp4

  


  Bottom right
ffmpeg -y -i input.mp4 -vf "zoompan=z='if(lte(mod(time,16),4),2,1.05)':d=1:x=iw/1-(iw/zoom/2):y=ih/1-(ih/zoom/2):fps=29.97" output.mp4'

  


• How do I convert a 3D SBS dual-fisheye image to 3D SBS dual-equirectangular with only open-source tools ? [closed]

  21 octobre 2024, par Ethan T

  Canon has released a new 3D VR lens for their RF mount and I recently rented it to see what it's like to work with. Unfortunately, they charge a subscription fee for their conversion software, which I've also found to be inconveniently limited in real-world use cases. Thus I'm interested in an open-source approach to converting the video captured by this lens using something like ffmpeg.

  


  The video is dual-fisheye and the Canon tool produces dual-equirectangular side-by-side video. I would like to perform this same conversion in ffmpeg or a similarly-powerful open-source tool.

  


  Related questions exist but aren't quite correct. Most dual-fisheye input seems to be used to create 360-degree 2D video, not 3D SBS.

  


• Error setting option use_wallclock_as_timestamps to value 1 in FFmpegFrameGrabber - avformat_open_input() error -22

  29 mai 2023, par githubwyj

  avformat_open_input() error -22 Error setting option

  


  FFmpegFrameGrabber grabber = new FFmpegFrameGrabber("rtsp://xxxxx");
grabber.setOption("use_wallclock_as_timestamps", "1");
grabber.setOption("rtsp_transport", "tcp");
grabber.setOption("rtsp_flags", "prefer_tcp");

grabber.start();


  


  I used ffmpeg in JavaCV to pull rtsp streams, but there was an error like this

  


  Error: [rtsp @ 0x7f2770145a60] Invalid option type.

Error: [rtsp @ 0x7f2770145a60] Error setting option use_wallclock_as_timestamps to value 1.

Error: [rtsp @ 0x7f2770145a60] Invalid option type.

Error: [rtsp @ 0x7f2770145a60] Error setting option use_wallclock_as_timestamps to value 1.

org.bytedeco.javacv.FFmpegFrameGrabber$Exception: avformat_open_input() error -22: Could not open input "rtsp://xxxx@10.10.10.119:554/video/1". (Has setFormat() been called?) (For more details, make sure FFmpegLogCallback.set() has been called.)
        at org.bytedeco.javacv.FFmpegFrameGrabber.startUnsafe(FFmpegFrameGrabber.java:975)
        at org.bytedeco.javacv.FFmpegFrameGrabber.start(FFmpegFrameGrabber.java:903)
        at org.bytedeco.javacv.FFmpegFrameGrabber.start(FFmpegFrameGrabber.java:898)




  


  When I removed grabber.setOption("use_wallclock_as_timestamps", "1");, the following error occurred：

  


  2023-05-29 11:11:02.169 [pool-2-thread-9] ERROR [FFmpegLogCallback:54] - [RTSP demuxer @ 0x7f2b8c007240] [Eval @ 0x7f2b32790080] Undefined constant or missing '(' in 'prefer_tcp'

2023-05-29 11:11:02.169 [pool-2-thread-9] ERROR [FFmpegLogCallback:54] - [RTSP demuxer @ 0x7f2b8c007240] Unable to parse option value "prefer_tcp"

2023-05-29 11:11:02.170 [pool-2-thread-9] ERROR [FFmpegLogCallback:54] - [RTSP demuxer @ 0x7f2b8c007240] Error setting option rtsp_flags to value prefer_tcp.

2023-05-29 11:11:02.170 [pool-2-thread-9] ERROR [FFmpegLogCallback:54] - [RTSP demuxer @ 0x7f2b8c007240] [Eval @ 0x7f2b32790080] Undefined constant or missing '(' in 'prefer_tcp'

2023-05-29 11:11:02.170 [pool-2-thread-9] ERROR [FFmpegLogCallback:54] - [RTSP demuxer @ 0x7f2b8c007240] Unable to parse option value "prefer_tcp"

2023-05-29 11:11:02.170 [pool-2-thread-9] ERROR [FFmpegLogCallback:54] - [RTSP demuxer @ 0x7f2b8c007240] Error setting option rtsp_flags to value prefer_tcp.



org.bytedeco.javacv.FFmpegFrameGrabber$Exception: avformat_open_input() error -22: Could not open input "rtsp://xxxx@10.10.10.119:554/video/1". (Has setFormat() been called?) (For more details, make sure FFmpegLogCallback.set() has been called.)
        at org.bytedeco.javacv.FFmpegFrameGrabber.startUnsafe(FFmpegFrameGrabber.java:975)
        at org.bytedeco.javacv.FFmpegFrameGrabber.start(FFmpegFrameGrabber.java:903)
        at org.bytedeco.javacv.FFmpegFrameGrabber.start(FFmpegFrameGrabber.java:898)



  


  javacv&ffmpeg :

  


  'org.bytedeco:javacv-platform:1.5.8',
'org.bytedeco:ffmpeg-platform:5.1.2-1.5.8',