ConvertOnline

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1. Convert Online
2. Video Converters
3. MKV to M4V

{
  "convert": "mkv-m4v",
  "multiple": true,
  "from": "mkv",
  "to": "m4v",
  "controls": [
    {
      "type": "number",
      "name": "vframes",
      "label": "Limit Video Frames",
      "optional": true,
      "range": {
        "min": 1,
        "max": 1000000
      },
      "desc": "Set the number of video frames to output. Useful for creating previews or trimming the video length. Leave blank to include all frames."
    },
    {
      "type": "dropdown",
      "name": "framerate",
      "label": "Frame Rate (fps)",
      "options": [
        {
          "label": "15 fps",
          "value": "15"
        },
        {
          "label": "24 fps (Film)",
          "value": "24"
        },
        {
          "label": "30 fps (TV Standard)",
          "value": "30"
        },
        {
          "label": "60 fps (Smooth Motion)",
          "value": "60"
        }
      ],
      "defaultValue": "30",
      "desc": "Controls how many frames per second are encoded. Higher frame rates result in smoother motion but larger file sizes."
    },
    {
      "type": "text",
      "name": "resolution",
      "label": "Video Resolution",
      "placeholder": "e.g., 1280x720",
      "desc": "Sets the output video resolution in width x height format (e.g., 1920x1080 for Full HD). Leave blank to keep original size."
    },
    {
      "type": "dropdown",
      "name": "aspect",
      "label": "Aspect Ratio",
      "options": [
        {
          "label": "Original",
          "value": ""
        },
        {
          "label": "4:3 (Standard)",
          "value": "4:3"
        },
        {
          "label": "16:9 (Widescreen)",
          "value": "16:9"
        },
        {
          "label": "1.3333",
          "value": "1.3333"
        },
        {
          "label": "1.7777",
          "value": "1.7777"
        }
      ],
      "defaultValue": "",
      "desc": "Defines the pixel aspect ratio of the video. Useful when converting between formats with different display properties."
    },
    {
      "type": "dropdown",
      "name": "video_bitrate",
      "label": "Video Bitrate",
      "options": [
        {
          "label": "500 kbps (Low)",
          "value": "500k"
        },
        {
          "label": "1000 kbps",
          "value": "1000k"
        },
        {
          "label": "2000 kbps (Standard)",
          "value": "2000k"
        },
        {
          "label": "4000 kbps (High)",
          "value": "4000k"
        },
        {
          "label": "8000 kbps (Very High)",
          "value": "8000k"
        }
      ],
      "defaultValue": "2000k",
      "desc": "Sets the video bitrate. Higher bitrate improves quality but increases file size. 2000k is a common default for standard HD video."
    },
    {
      "type": "dropdown",
      "name": "video_codec",
      "label": "Video Codec",
      "options": [
        {
          "label": "Auto (let FFmpeg choose)",
          "value": ""
        },
        {
          "label": "H.264",
          "value": "libx264"
        },
        {
          "label": "Copy original",
          "value": "copy"
        }
      ],
      "defaultValue": "",
      "desc": "Choose the codec used for video encoding. 'copy' keeps the original video stream without re-encoding (if compatible with M4V)."
    },
    {
      "type": "text",
      "name": "timecode",
      "label": "Timecode Start (hh:mm:ss)",
      "optional": true,
      "placeholder": "00:00:00",
      "desc": "Sets the starting timecode of the video. Useful for syncing, editing, or media authoring workflows. Format: hh:mm:ss"
    }
  ],
  "note": "The M4V format is primarily used by Apple devices and supports H.264 video and AAC audio codecs. Make sure your source video stream is compatible if using 'copy'. If not, re-encode with libx264. Bitrate, resolution, and frame rate affect both quality and file size. Some MKV features (like subtitles or advanced audio) may not be retained in M4V.",
  "type": "video",
  "operation": "convert"
}