ConvertOnline

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

{
  "convert": "m4v-mkv",
  "multiple": true,
  "from": "m4v",
  "to": "mkv",
  "controls": [
    {
      "type": "number",
      "optional": true,
      "name": "vframes",
      "label": "Number of Video Frames",
      "range": {
        "min": 1,
        "max": 1000000
      },
      "desc": "Sets the exact number of video frames to output. Useful for trimming or testing. Leave blank to keep 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": "25 fps (PAL)",
          "value": 25
        },
        {
          "label": "30 fps (NTSC)",
          "value": 30
        },
        {
          "label": "60 fps (High Smoothness)",
          "value": 60
        }
      ],
      "defaultValue": 30,
      "desc": "Sets the output video frame rate. Higher frame rates result in smoother motion but larger file sizes."
    },
    {
      "type": "text",
      "optional": true,
      "name": "size",
      "label": "Frame Size (WxH)",
      "placeholder": "1920x1080",
      "desc": "Specifies the output resolution (width x height). Leave blank to keep the original resolution."
    },
    {
      "type": "dropdown",
      "name": "aspect",
      "label": "Aspect Ratio",
      "options": [
        {
          "label": "Auto (Original)",
          "value": "auto"
        },
        {
          "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": "auto",
      "desc": "Sets the display aspect ratio. 'Auto' keeps the original video aspect ratio."
    },
    {
      "type": "dropdown",
      "name": "vcodec",
      "label": "Video Codec",
      "options": [
        {
          "label": "Copy Original",
          "value": "copy"
        },
        {
          "label": "H.264",
          "value": "libx264"
        },
        {
          "label": "H.265 / HEVC",
          "value": "libx265"
        },
        {
          "label": "VP9",
          "value": "libvpx-vp9"
        }
      ],
      "defaultValue": "copy",
      "desc": "Selects the video codec for output. 'Copy' avoids re-encoding, keeping original quality."
    },
    {
      "type": "dropdown",
      "name": "video_bitrate",
      "label": "Video Bitrate",
      "options": [
        {
          "label": "500 kbps (Low)",
          "value": "500k"
        },
        {
          "label": "1 Mbps (Standard)",
          "value": "1000k"
        },
        {
          "label": "2 Mbps (High)",
          "value": "2000k"
        },
        {
          "label": "5 Mbps (HD)",
          "value": "5000k"
        },
        {
          "label": "10 Mbps (Full HD)",
          "value": "10000k"
        }
      ],
      "defaultValue": "2000k",
      "desc": "Sets the target video bitrate. Higher bitrates improve quality but increase file size."
    },
    {
      "type": "text",
      "optional": true,
      "name": "timecode",
      "label": "Initial Timecode",
      "placeholder": "00:00:00:00",
      "desc": "Sets the starting timecode in hh:mm:ss:ff format. Useful for professional video editing workflows."
    },
    {
      "type": "number",
      "optional": true,
      "name": "pass",
      "label": "Encoding Pass",
      "range": {
        "min": 1,
        "max": 3
      },
      "defaultValue": 1,
      "desc": "Specifies the pass number for multi-pass encoding. Use 1 for single-pass (faster), 2 or 3 for better quality and bitrate control."
    },
    {
      "type": "text",
      "optional": true,
      "name": "vf",
      "label": "Video Filters",
      "placeholder": "scale=1280:720",
      "desc": "Apply FFmpeg video filters such as scaling, cropping, or sharpening. Use advanced syntax if familiar."
    }
  ],
  "type": "video"
}