ConvertOnline

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

{
  "convert": "m4v-webm",
  "multiple": true,
  "from": "m4v",
  "to": "webm",
  "controls": [
    {
      "type": "number",
      "optional": true,
      "name": "vframes",
      "label": "Number of Frames",
      "range": {
        "min": 1,
        "max": 100000
      },
      "desc": "Specifies how many video frames to output. Leave blank to convert the entire video."
    },
    {
      "type": "dropdown",
      "name": "frame_rate",
      "label": "Frame Rate (fps)",
      "options": [
        {
          "label": "Same as source",
          "value": null
        },
        {
          "label": "24 fps",
          "value": 24
        },
        {
          "label": "30 fps",
          "value": 30
        },
        {
          "label": "60 fps",
          "value": 60
        }
      ],
      "defaultValue": null,
      "desc": "Sets the playback frame rate of the output video. 'Same as source' preserves the original rate."
    },
    {
      "type": "text",
      "optional": true,
      "name": "size",
      "label": "Resolution",
      "placeholder": "e.g. 1920x1080",
      "desc": "Set output video resolution in WxH format (e.g., 1280x720). Leave blank to keep original resolution."
    },
    {
      "type": "dropdown",
      "name": "aspect_ratio",
      "label": "Aspect Ratio",
      "options": [
        {
          "label": "Same as source",
          "value": null
        },
        {
          "label": "4:3",
          "value": "4:3"
        },
        {
          "label": "16:9",
          "value": "16:9"
        }
      ],
      "defaultValue": null,
      "desc": "Sets the display aspect ratio of the output video. Leave as 'Same as source' to keep original ratio."
    },
    {
      "type": "dropdown",
      "name": "video_bitrate",
      "label": "Video Bitrate",
      "options": [
        {
          "label": "1 Mbps (Low)",
          "value": "1M"
        },
        {
          "label": "2 Mbps (SD Quality)",
          "value": "2M"
        },
        {
          "label": "5 Mbps (HD Quality)",
          "value": "5M"
        },
        {
          "label": "8 Mbps (Full HD)",
          "value": "8M"
        }
      ],
      "defaultValue": "5M",
      "desc": "Controls video quality and file size. Higher bitrate increases quality but also increases file size."
    },
    {
      "type": "dropdown",
      "name": "video_codec",
      "label": "Video Codec",
      "options": [
        {
          "label": "Default (libvpx-vp9)",
          "value": "libvpx-vp9"
        },
        {
          "label": "libvpx (VP8)",
          "value": "libvpx"
        },
        {
          "label": "Copy (no re-encode)",
          "value": "copy"
        }
      ],
      "defaultValue": "libvpx-vp9",
      "desc": "Specifies the video codec for the output file. VP9 offers better compression, VP8 is more compatible, and 'copy' keeps the original stream."
    },
    {
      "type": "dropdown",
      "name": "audio_bitrate",
      "label": "Audio Bitrate",
      "options": [
        {
          "label": "64 kbps",
          "value": "64k"
        },
        {
          "label": "96 kbps",
          "value": "96k"
        },
        {
          "label": "128 kbps (Standard)",
          "value": "128k"
        },
        {
          "label": "192 kbps",
          "value": "192k"
        }
      ],
      "defaultValue": "128k",
      "desc": "Sets the audio bitrate for the output video. Higher bitrate means better audio quality but larger file size."
    },
    {
      "type": "text",
      "optional": true,
      "name": "timecode",
      "label": "Start Timecode",
      "placeholder": "hh:mm:ss",
      "desc": "Sets the initial timecode for the output video. Useful for syncing with other media."
    }
  ],
  "note": "When converting M4V to WebM, VP9 (libvpx-vp9) is recommended for best quality-to-size ratio. If you choose 'copy' for the codec, ensure the source video is already WebM-compatible; otherwise playback issues may occur.",
  "type": "video",
  "operation": "convert"
}