ConvertOnline

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

{
  "convert": "mkv-flv",
  "multiple": true,
  "from": "mkv",
  "to": "flv",
  "controls": [
    {
      "type": "dropdown",
      "name": "video_bitrate",
      "label": "Video Bitrate",
      "options": [
        {
          "label": "500 kbps (Low)",
          "value": "500k"
        },
        {
          "label": "1000 kbps (Medium)",
          "value": "1000k"
        },
        {
          "label": "2000 kbps (High)",
          "value": "2000k"
        },
        {
          "label": "4000 kbps (Very High)",
          "value": "4000k"
        }
      ],
      "defaultValue": "1000k",
      "desc": "Sets the video bitrate which affects quality and file size. Higher bitrates result in better quality but larger files. The FLV format commonly uses 500–2000 kbps."
    },
    {
      "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 video frames per second. 24–30 fps is common. Use 60 fps for smoother motion, but it increases file size."
    },
    {
      "type": "text",
      "name": "resolution",
      "label": "Resolution (WxH)",
      "placeholder": "e.g., 1280x720",
      "defaultValue": "",
      "optional": true,
      "desc": "Specifies the output video resolution. Leave blank to keep the original size. Use format like 1280x720 or 640x360."
    },
    {
      "type": "dropdown",
      "name": "aspect_ratio",
      "label": "Aspect Ratio",
      "options": [
        {
          "label": "Default (Keep Original)",
          "value": ""
        },
        {
          "label": "4:3",
          "value": "4:3"
        },
        {
          "label": "16:9",
          "value": "16:9"
        }
      ],
      "defaultValue": "",
      "desc": "Sets the video display aspect ratio. Leave empty to preserve the original ratio. Use 16:9 for widescreen or 4:3 for standard."
    },
    {
      "type": "dropdown",
      "name": "audio_bitrate",
      "label": "Audio Bitrate",
      "options": [
        {
          "label": "64 kbps",
          "value": "64k"
        },
        {
          "label": "96 kbps",
          "value": "96k"
        },
        {
          "label": "128 kbps",
          "value": "128k"
        }
      ],
      "defaultValue": "128k",
      "desc": "Sets the audio stream bitrate. 128 kbps provides good audio quality while maintaining a small file size. FLV supports MP3 or AAC audio internally."
    },
    {
      "type": "dropdown",
      "name": "pass",
      "label": "Encoding Pass",
      "options": [
        {
          "label": "Single Pass",
          "value": 1
        },
        {
          "label": "Two Pass (Better Quality)",
          "value": 2
        }
      ],
      "defaultValue": 1,
      "desc": "Selects the number of encoding passes. Two-pass encoding provides better quality at a given bitrate but takes longer to process."
    },
    {
      "type": "text",
      "name": "timecode",
      "label": "Start Timecode (optional)",
      "placeholder": "e.g., 00:00:00:00",
      "optional": true,
      "desc": "Sets a custom timecode for the start of the video. Format: hh:mm:ss:ff. Leave blank to use default timing."
    }
  ],
  "note": "The FLV format is commonly used for streaming and supports only a limited set of video and audio codecs (e.g., H.264 video and MP3/AAC audio). Make sure the input MKV contains compatible streams, or FFmpeg will transcode them during conversion. If no resolution or aspect ratio is set, the original settings will be preserved.",
  "type": "video"
}