ConvertOnline

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1. Convert Online
2. Video Converters
3. WEBM to MKV

{
  "convert": "webm-mkv",
  "multiple": true,
  "from": "webm",
  "to": "mkv",
  "controls": [
    {
      "type": "number",
      "optional": true,
      "name": "vframes",
      "label": "Video Frames Limit",
      "range": {
        "min": 1,
        "max": 100000
      },
      "desc": "Limits the number of video frames in the output. Useful for trimming videos or extracting short clips. Leave blank to convert the full video."
    },
    {
      "type": "dropdown",
      "name": "frame_rate",
      "label": "Frame Rate (fps)",
      "options": [
        {
          "label": "15 fps",
          "value": 15
        },
        {
          "label": "24 fps (Film)",
          "value": 24
        },
        {
          "label": "30 fps (Standard)",
          "value": 30
        },
        {
          "label": "60 fps (Smooth)",
          "value": 60
        }
      ],
      "defaultValue": 30,
      "desc": "Sets the number of frames per second in the output video. Higher frame rates give smoother motion but increase file size."
    },
    {
      "type": "text",
      "optional": true,
      "name": "resolution",
      "label": "Resolution (WxH)",
      "placeholder": "e.g., 1280x720",
      "desc": "Specifies the output video resolution. Use standard formats like 1920x1080 (Full HD) or 1280x720 (HD). Leave blank to keep the original size."
    },
    {
      "type": "dropdown",
      "name": "aspect_ratio",
      "label": "Aspect Ratio",
      "options": [
        {
          "label": "Original",
          "value": ""
        },
        {
          "label": "4:3",
          "value": "4:3"
        },
        {
          "label": "16:9",
          "value": "16:9"
        },
        {
          "label": "1.3333",
          "value": "1.3333"
        },
        {
          "label": "1.7777",
          "value": "1.7777"
        }
      ],
      "defaultValue": "",
      "desc": "Sets the output video aspect ratio. Leave as 'Original' to keep the source ratio."
    },
    {
      "type": "dropdown",
      "name": "video_bitrate",
      "label": "Video Bitrate",
      "options": [
        {
          "label": "500 kbps (Low)",
          "value": "500k"
        },
        {
          "label": "1000 kbps (Standard)",
          "value": "1000k"
        },
        {
          "label": "2000 kbps (High)",
          "value": "2000k"
        },
        {
          "label": "4000 kbps (HD)",
          "value": "4000k"
        },
        {
          "label": "8000 kbps (Full HD)",
          "value": "8000k"
        }
      ],
      "defaultValue": "2000k",
      "desc": "Controls the video bitrate. Higher bitrate improves quality but increases file size. A good balance for HD is around 4000 kbps."
    },
    {
      "type": "dropdown",
      "name": "video_codec",
      "label": "Video Codec",
      "options": [
        {
          "label": "Copy (No Re-encode)",
          "value": "copy"
        },
        {
          "label": "libx264 (H.264)",
          "value": "libx264"
        },
        {
          "label": "libx265 (H.265)",
          "value": "libx265"
        },
        {
          "label": "vp9",
          "value": "vp9"
        }
      ],
      "defaultValue": "libx264",
      "desc": "Select the video codec to use during conversion. Use 'copy' for fast conversions without re-encoding. H.264 is widely supported."
    },
    {
      "type": "dropdown",
      "name": "audio_bitrate",
      "label": "Audio Bitrate",
      "options": [
        {
          "label": "96 kbps",
          "value": "96k"
        },
        {
          "label": "128 kbps (Standard)",
          "value": "128k"
        },
        {
          "label": "192 kbps",
          "value": "192k"
        },
        {
          "label": "256 kbps",
          "value": "256k"
        }
      ],
      "defaultValue": "128k",
      "desc": "Sets the audio bitrate for the output video. Higher bitrates offer better audio quality."
    }
  ],
  "note": "MKV is a flexible multimedia container that supports nearly any video/audio codec. This profile allows full customization of video codec, bitrate, frame rate, resolution, and audio bitrate. If 'copy' is selected for the video codec, most other video settings will be ignored because the original stream is preserved without re-encoding.",
  "type": "video",
  "operation": "convert"
}