ConvertOnline

Image

Audio

Video

Document

Color

1. Convert Online
2. Video Converters
3. MP4 to MKV

{
  "convert": "mp4-mkv",
  "multiple": true,
  "from": "mp4",
  "to": "mkv",
  "controls": [
    {
      "type": "dropdown",
      "name": "vcodec",
      "label": "Video Codec",
      "options": [
        {
          "label": "H.264 (libx264)",
          "value": "libx264"
        },
        {
          "label": "H.265 / HEVC (libx265)",
          "value": "libx265"
        },
        {
          "label": "VP9 (libvpx-vp9)",
          "value": "libvpx-vp9"
        },
        {
          "label": "Copy original",
          "value": "copy"
        }
      ],
      "defaultValue": "libx264",
      "desc": "Specifies the video codec for the MKV file. Choose 'copy' to avoid re-encoding and speed up conversion. Otherwise, select a codec based on compatibility and compression."
    },
    {
      "type": "dropdown",
      "name": "bitrate",
      "label": "Video Bitrate",
      "options": [
        {
          "label": "500 kbps",
          "value": "500k"
        },
        {
          "label": "1000 kbps (1 Mbps)",
          "value": "1000k"
        },
        {
          "label": "2000 kbps (2 Mbps)",
          "value": "2000k"
        },
        {
          "label": "4000 kbps (4 Mbps)",
          "value": "4000k"
        },
        {
          "label": "8000 kbps (8 Mbps)",
          "value": "8000k"
        }
      ],
      "defaultValue": "2000k",
      "desc": "Sets the target video bitrate. Higher values improve quality but increase file size. If 'copy' is selected as codec, this is ignored."
    },
    {
      "type": "dropdown",
      "name": "frame_rate",
      "label": "Frame Rate (fps)",
      "options": [
        {
          "label": "24 fps",
          "value": 24
        },
        {
          "label": "30 fps",
          "value": 30
        },
        {
          "label": "60 fps",
          "value": 60
        }
      ],
      "defaultValue": 30,
      "desc": "Sets the output video's frame rate. Lower frame rates reduce size, while higher frame rates make motion smoother."
    },
    {
      "type": "text",
      "name": "resolution",
      "label": "Resolution (WxH)",
      "placeholder": "e.g. 1280x720",
      "desc": "Sets the output video resolution. Leave blank to keep the original resolution. Format must be width x height (e.g. 1920x1080)."
    },
    {
      "type": "dropdown",
      "name": "aspect",
      "label": "Aspect Ratio",
      "options": [
        {
          "label": "Default (keep original)",
          "value": ""
        },
        {
          "label": "4:3",
          "value": "4:3"
        },
        {
          "label": "16:9",
          "value": "16:9"
        },
        {
          "label": "21:9",
          "value": "21:9"
        }
      ],
      "defaultValue": "",
      "desc": "Specifies the display aspect ratio. Only needed if you want to force a different aspect than the original."
    },
    {
      "type": "number",
      "name": "vframes",
      "label": "Limit Output Frames",
      "optional": true,
      "range": {
        "min": 1,
        "max": 100000
      },
      "desc": "Limits the number of video frames in the output file. Useful for trimming or testing. Leave blank to include all frames."
    },
    {
      "type": "checkbox",
      "name": "disable_video",
      "label": "Disable Video Stream",
      "defaultValue": false,
      "desc": "Removes the video stream from the output, keeping only audio. Useful for extracting audio from videos."
    },
    {
      "type": "checkbox",
      "name": "disable_data",
      "label": "Disable Data Streams",
      "defaultValue": true,
      "desc": "Removes non-audio/video data streams (like subtitles or metadata) from the output MKV file."
    }
  ],
  "type": "video"
}