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

{
  "convert": "flv-m4v",
  "multiple": true,
  "from": "flv",
  "to": "m4v",
  "controls": [
    {
      "type": "number",
      "optional": true,
      "name": "vframes",
      "label": "Number of Video Frames",
      "range": {
        "min": 1,
        "max": 100000
      },
      "desc": "Limits the number of frames in the output video. Useful for short previews or trimming without specifying time."
    },
    {
      "type": "dropdown",
      "name": "frame_rate",
      "label": "Frame Rate (fps)",
      "options": [
        {
          "label": "23.976 fps",
          "value": "23.976"
        },
        {
          "label": "25 fps (PAL)",
          "value": "25"
        },
        {
          "label": "29.97 fps (NTSC)",
          "value": "29.97"
        },
        {
          "label": "30 fps",
          "value": "30"
        },
        {
          "label": "60 fps",
          "value": "60"
        }
      ],
      "defaultValue": "30",
      "desc": "Sets the number of frames per second in the output video. Higher frame rates produce smoother motion but increase file size."
    },
    {
      "type": "text",
      "name": "size",
      "label": "Frame Size (Resolution)",
      "placeholder": "e.g., 1920x1080",
      "desc": "Specifies output resolution in WxH format (e.g., 1280x720). Use original size for no scaling."
    },
    {
      "type": "dropdown",
      "name": "aspect",
      "label": "Aspect Ratio",
      "options": [
        {
          "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": "16:9",
      "desc": "Sets the display aspect ratio of the output video."
    },
    {
      "type": "number",
      "optional": true,
      "name": "bits_per_raw_sample",
      "label": "Bits per Raw Sample",
      "range": {
        "min": 8,
        "max": 16
      },
      "desc": "Specifies bit depth per raw sample. Higher values can improve quality but increase file size."
    },
    {
      "type": "dropdown",
      "name": "video_codec",
      "label": "Video Codec",
      "options": [
        {
          "label": "H.264",
          "value": "libx264"
        },
        {
          "label": "H.265/HEVC",
          "value": "libx265"
        },
        {
          "label": "MPEG-4",
          "value": "mpeg4"
        },
        {
          "label": "Copy Original",
          "value": "copy"
        }
      ],
      "defaultValue": "libx264",
      "desc": "Specifies the encoding codec for the video stream."
    },
    {
      "type": "text",
      "optional": true,
      "name": "timecode",
      "label": "Initial Timecode",
      "placeholder": "hh:mm:ss[:;.]ff",
      "desc": "Sets the initial SMPTE timecode for the video (e.g., 00:00:00:00)."
    },
    {
      "type": "dropdown",
      "name": "pass",
      "label": "Encoding Pass",
      "options": [
        {
          "label": "1-Pass (Fast)",
          "value": 1
        },
        {
          "label": "2-Pass (Balanced)",
          "value": 2
        },
        {
          "label": "3-Pass (Best Quality)",
          "value": 3
        }
      ],
      "defaultValue": 1,
      "desc": "Controls multi-pass encoding for quality optimization. 2-pass provides better quality at the same bitrate."
    },
    {
      "type": "text",
      "optional": true,
      "name": "video_filters",
      "label": "Video Filters",
      "placeholder": "e.g., scale=1280:720,transpose=1",
      "desc": "Applies FFmpeg video filters to the output, such as scaling, cropping, or rotation."
    },
    {
      "type": "dropdown",
      "name": "video_bitrate",
      "label": "Video Bitrate",
      "options": [
        {
          "label": "500 kbps",
          "value": "500k"
        },
        {
          "label": "1000 kbps",
          "value": "1000k"
        },
        {
          "label": "2000 kbps",
          "value": "2000k"
        },
        {
          "label": "4000 kbps",
          "value": "4000k"
        }
      ],
      "defaultValue": "2000k",
      "desc": "Sets the average video bitrate for the output. Higher bitrates improve quality but increase file size."
    },
    {
      "type": "dropdown",
      "name": "audio_bitrate",
      "label": "Audio Bitrate",
      "options": [
        {
          "label": "64 kbps",
          "value": "64k"
        },
        {
          "label": "96 kbps",
          "value": "96k"
        },
        {
          "label": "128 kbps",
          "value": "128k"
        },
        {
          "label": "192 kbps",
          "value": "192k"
        }
      ],
      "defaultValue": "128k",
      "desc": "Sets the audio bitrate for the output video."
    }
  ],
  "note": "FLV to M4V conversion allows you to re-encode Flash Video files into the M4V format, typically using H.264 or MPEG-4 codecs. You can control frame rate, resolution, aspect ratio, and bitrates for both video and audio. Using multi-pass encoding can improve quality, especially at lower bitrates.",
  "type": "video",
  "operation": "convert"
}