解决Vimeo视频下载中断后m4s音视频文件拼接问题

云上老周

2026-8-12

Vimeo视频下载进度卡99%（仅获m4s分段文件）的解决方法

下载Vimeo视频时进度始终停在99%，仅得到对应视频流与音频流的两组m4s文件，尝试重命名扩展名、ffmpeg直接拼接等方法均无效。经分析，音视频流均由初始化文件+分段文件构成，可行解决方案如下：

打开目标视频页面，启动浏览器开发者工具（Firefox快捷键CTRL-SHIFT-C），播放视频并监控Network流量，找到包含流信息的JSON数据。以1280x720分辨率的视频流为例：

{
  "id": "b522db58",
  "base_url": "video/",
  "format": "dash",
  "mime_type": "video/mp4",
  "codecs": "avc1.640020",
  "bitrate": 2895000,
  "avg_bitrate": 1068000,
  "duration": 6787.88,
  "framerate": 25,
  "width": 1280,
  "height": 720,
  "max_segment_duration": 7,
  "init_segment": "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",
  "index_segment": "b522db58.mp4?r=dXMtd2VzdDE%3D&range=831-14434",
  "segments": [
    {
      "start": 0,
      "end": 6.08,
      "url": "b522db58.mp4?r=dXMtd2VzdDE%3D&range=14435-328375",
      "size": 313940
    },
    {

提取视频流中的init_segment值，保存为video_start.mp4，通过Base64解码工具解码该文件，得到视频初始化文件。
使用十六进制编辑器，按正确顺序（可通过文件大小识别分段顺序）拼接video_start.mp4与所有视频m4s分段文件，保存为完整的video.mp4。
对音频流执行相同的前3步操作，先找到音频流的JSON信息：

"audio": [
  {
    "id": "d27f1f72",
    "base_url": "audio/",
    "format": "dash",
    "mime_type": "audio/mp4",
    "codecs": "mp4a.40.2",
    "bitrate": 191000,
    "avg_bitrate": 191000,
    "duration": 6787.84,
    "channels": 2,
    "sample_rate": 48000,
    "max_segment_duration": 8,
    "init_segment": "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",
    "index_segment": "d27f1f72.mp4?r=dXM%3D&range=710-14325",
    "segments": [
      {
        "start": 0,
        "end": 5.994666666666666,
        "url": "d27f1f72.mp4?r=dXM%3D&range=14326-157787",
        "size": 143461
      },

提取音频流的init_segment值，保存为audio_start.mp4并解码，拼接所有音频m4s分段文件为完整的audio.mp4。
执行ffmpeg命令合并音视频：

ffmpeg -i video.mp4 -i audio.mp4 -c copy output.mp4

完成以上步骤后即可得到完整的目标视频。

内容的提问来源于stack exchange，提问作者Veverica10