If your computer can’t keep up, you will start getting errors “real-time buffer too full or near too full (78% of size: 250000000 )! frame dropped!”. Use the slowest setting that your computer can keep up with without maxing out your processor. The useful values in order veryslow, slower, slow, medium, fast, faster, veryfast. -preset medium Preset defines how hard the engine will work to compress video.-c:v libx264 Use x264 to generate h264 encoded video.scale=640x480 resize down to 640x480 which is a more standard 4:3 AR resolution.First two parameters are spatial strength, second two are temporal strength. hqdn3d=6:4:14:10 Remove noise from the video (also improves compression).crop=w=702:h=576 Crop off the edges of the video to the correct 4:3 aspect ratio PAL AR.yadif=0:0:0 Deinterlace the video input.fps=25 Extra pedantic conversion to 25FPS, adding here seems to help avoid spammy console warnings saying Past duration X.XX is too large.-vf Start video filter definitions (comma separated, ordered processing).When in doubt, set the time to 4:10:00 and stop the recording by pressing Q when the VHS player reaches the end of the tape. Generally tapes will have an indicator on them somewhere as E-60, E-120, E-240. This can be set based on the type of VHS being converted. Do allow for an extra 10 minutes or so after that as they are often slightly longer.Set the length to stop the recording at. The number after E is the number of minutes on the tape. VHS tapes will usually be marked as E-60, E-120, E-240. -t 4:10:00 Time after which to stop recording.-i video="Conexant Polaris Video Capture":audio="Conexant Polaris Video Capture" Video and audio coming from the same video input device from above.-crossbar_audio_input_pin_number 2 Audio crossbar input pin from above.-crossbar_video_input_pin_number 0 Video crossbar input pin from above.This is needed if you are operating near the processing limit of your computer and need to handle spikes of processing work without losing frames. Defines a 250MB buffer to be used as needed for storing a backlog of frames to process. -rtbufsize 250000k Real-Time input buffer size.-f dshow DirectShow input format (Windows specific).In this case I am using PAL type VHS, so the input is appropriate. matches one of the video device option sets from above. -vsync 1 Video synchronization method, “Frames will be duplicated and dropped to achieve exactly the requested constant frame rate.” vsync reference.-framerate 25 Video framerate as 25 FPS.The arguments are broken down as follows: Video Input Format Here is the command used for converting the video Audio crossbar input is Crossbar Input pin 2 - "Audio Line".Video crossbar input is Crossbar Input pin 0 - "Video Composite".
If the audio and video are two separate devices then the commands below can omit the crossbar pin selection. This complicates the command as we need to select the correct crossbar input pins for audio and video. Crossbar Input pin 2 - "Audio Line" related input pin: 0įor this USB device, the video device is both a video and audio device. Crossbar Input pin 1 - "S-Video" related input pin: 2 Crossbar Input pin 0 - "Video Composite" related input pin: 2 Crossbar Output pin 1: "Audio Decoder" related output pin: 0 current input pin: 2 compatible input pins: 2 Crossbar Output pin 0: "Video Decoder" related output pin: 1 current input pin: 0 compatible input pins: 0 1 Crossbar Switching Information for Conexant Polaris Video Capture: Pin "Audio Out" (alternative pin name "3") Pin "Capture" (alternative pin name "2") DirectShow video device options (from video devices)
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