Building URL with separate video audio files

[rguedes]

Hey,

I'm using [nginx-vod-module] as local mode.

Domain.tld

Files:

video: TITLE.720p.6f934a9.mp4 video: TITLE.1080p.6f934a9.mp4

audio: TITLE.AAC2.0.en.5ab34b.mp4 audio: TITLE.AC3.5.1.en.5ab34b.mp4

audio: TITLE.AAC2.0.de.6bb34b.mp4

subs: TITLE.en.d9cba4.srt subs: TITLE.pt-PT.3c49f2.srt subs: TITLE.fi.a679e2.srt

How can I build the url to DASH and HLS?

With a single video+audio file, I'm building like that: https://Domain.tld/dash/,TITLE.720p.AAC2.0.en.mp4,lang/eng/TITLE.en.d9cba4.srt,lang/por/TITLE.pt-PT.3c49f2.srt,.urlset/manifest.mpd or https://Domain.tld/dash/,TITLE.1080p.AAC2.0.en.mp4,TITLE.720p.AAC2.0.en.mp4,lang/eng/TITLE.en.d9cba4.srt,lang/por/TITLE.pt-PT.3c49f2.srt,.urlset/manifest.mpd

But now, I want to build with separate video and audio files, because I want to reuse the audios with different resolutions and subs, depending on device type and user language.

[rguedes]

similar: https://github.com/kaltura/nginx-vod-module/issues/908

[erankor]

Sorry, I don't understand the question... In general, you can take all the URLs you want (video, audio, captions) and combine them in multi-url syntax. The sample files you listed seem problematic though, because you have English AC3/5.1, without a matching German file, so don't see how that would work...

[rguedes]

I have:

• video1.1080p.mp4 (only with video stream)
• video1.720p.mp4 (only with video stream)
• audio_en_aac.mp4 (only audio stream)
• audio_en_ac3mp4 (only audio stream)
• audio_de_aac.mp4 (only audio stream)
• subsN.str

I want to build different urls like that:

• video1 + audio_en_aac (https://domain/dash/,video1.1080p.mp4,lang/eng/audio_en_aac.mp4,.urlset/manifest.mpd
• video1 + audio_en_ac3 (https://domain/dash/,video1.1080p.mp4,lang/eng/audio_en_ac3.mp4,.urlset/manifest.mpd
• video2 + audio_en_aac https://domain/dash/,video1.720p.mp4,lang/eng/audio_en_ac3.mp4,.urlset/manifest.mpd
• video2 + audio_de_aac https://domain/dash/,video1.720p.mp4,lang/eng/audio_de_aac.mp4,.urlset/manifest.mpd
• video1 + video2 + audio https://domain/dash/,video1.1080p.mp4,video1.720p.mp4,lang/eng/audio_en_ac3.mp4,lang/eng/audio_en_aac.mp4,.urlset/manifest.mpd
• etc

• But if I try to do that, I got an error:

ngx_http_vod_validate_streams: no matching streams were found while reading media header,

[rguedes]

I try with mapped too:

{
  "sequences": [
    {
      "clips": [
        {
          "type": "source",
          "path": "/media/a2b1e3/video1.1080p.mp4"
        }
      ]
    },
    {
      "clips": [
        {
          "type": "source",
          "path": "/media/a2b1e3/video1.720p.mp4"
        }
      ]
    },    
    {
      "clips": [
        {
          "type": "source",
          "path": "/media/a2b1e3/audio_ac3_en.mp4"
        }
      ]
    },    
    {
      "clips": [
        {
          "type": "source",
          "path": "/media/a2b1e3/audio_aac_en.mp4"
        }
      ]
    },
    {
      "language": "por",
      "clips": [
        {
          "type": "source",
          "path": "/media/a2b1e3/subs.pt-PT.3c49f2.srt"
        }
      ]
    },
    {
      "language": "eng",
      "clips": [
        {
          "type": "source",
          "path": "/media/a2b1e3/subs.en.d9cba4.srt"
        }
      ]
    }
  ]
}

error: ngx_http_vod_validate_streams: no matching streams were found while getting mapping

[erankor]

This error normally means either non-supported codec, or that the MP4 is a fragmented MP4 (which is not supported). When you pass multiple files, it takes whatever it can, so you're probably getting only a subset of what you provided, and don't notice it. In general, building partial URLs should work fine (it's a subset of the functionality of providing all...), but another alternative you may choose to use is to pass the list of sequences on the file name. For example .../manifest-f1-f2.mpd will return only the first two sequences. On one hand, this still leaves you with long URLs, but the upside is that the segments will have the same URLs as the "full" version, and they can be reused in CDN cache.

[rguedes]

This error normally means either non-supported codec, or that the MP4 is a fragmented MP4 (which is not supported).

I do some tests, and Make sense and you're right. Is there any debugger?

[erankor]

If you compile nginx with --with-debug and set the error_log level to debug, you'll get additional log messages. If that is not enough, you can use gdb.

[rguedes]

Fixed.

I used MP4Box to "remux" the mp4 again and that fixed my problem ;)

Thx for support and feedback.