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We are using Helix Server in order to distribute Video On Demand (with multi-bitrate) Content among our audience. This means that there is one MP4 file that contains multiple video streams and one audio stream. The source for our MP4 files is Helix Producer (encodes raw video into a MP4 file).

Helix Server does recognize the multiple different video streams within the file if we use the MP4 file straight from Helix Producer. FFprobe output for it:

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '..\..\validate\20140225095504.mp4':
  Metadata:
    major_brand     : 3gr6
    minor_version   : 0
    compatible_brands: 3gr63gp63gg63gp5isom
    creation_time   : 2014-02-25 08:55:04
  Duration: 01:35:54.14, start: 0.000000, bitrate: 1051 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 568x320, 285 kb/s, 23.80 fps, 25 tbr, 1k tbn, 50 tbc (default)
    Metadata:
      handler_name    : Video Stream
    Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 47 kb/s (default)
    Metadata:
      handler_name    : Audio Stream
    Stream #0:2(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 568x320, 653 kb/s, 23.80 fps, 25 tbr, 1k tbn, 50 tbc (default)
    Metadata:
      handler_name    : Video Stream
    Stream #0:3(und): Data: none (rtp  / 0x20707472), 17 kb/s (default)
    Metadata:
      handler_name    : Video Stream
    Stream #0:4(und): Data: none (rtp  / 0x20707472), 8 kb/s (default)
    Metadata:
      handler_name    : Audio Stream
    Stream #0:5(und): Data: none (rtp  / 0x20707472), 31 kb/s (default)
    Metadata:
      handler_name    : Video Stream
Unsupported codec with id 0 for input stream 3
Unsupported codec with id 0 for input stream 4
Unsupported codec with id 0 for input stream 5

However, we need to cut the file - we use FFmpeg in order to keep the multiple video streams:

ffmpeg.exe -i ..\..\validate\20140225095504.mp4 -map 0:0 -map 0:1 -map 0:2 -acodec copy -vcodec copy -ss 00:30:00 -t 00:03:00 -movflags faststart+rtphint out.mp4

This is where our problem starts. Helix Server does not recognize the different video streams anymore and only offers the first one to the client. FFprobe tells me the following about the new file:

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'out.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf55.34.101
  Duration: 00:03:00.00, start: 0.000000, bitrate: 2096 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 568x320, 286 kb/s, 23.87 fps, 25 tbr, 16k tbn, 50 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 47 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
    Stream #0:2(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 568x320, 655 kb/s, 23.87 fps, 25 tbr, 16k tbn, 50 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:3(eng): Data: none (rtp  / 0x20707472), 335 kb/s
    Metadata:
      handler_name    : HintHandler
    Stream #0:4(eng): Data: none (rtp  / 0x20707472), 3 kb/s
    Metadata:
      handler_name    : HintHandler
    Stream #0:5(eng): Data: none (rtp  / 0x20707472), 762 kb/s
    Metadata:
      handler_name    : HintHandler
Unsupported codec with id 0 for input stream 3
Unsupported codec with id 0 for input stream 4
Unsupported codec with id 0 for input stream 5

I already tried a considerable amount of combinations of all -movflags options and -rtpflag options. But none of them helped.

screenshot

I futhermore tried to set the major_brand with mp4box:

mp4box -brand 3gr6 out.mp4

and to create the hinting tracks with mp4box:

mp4box -hint out.mp4

But I'm stuck.

Does anybody have experience with Helix Server in combination with multi-bitrate MP4 files? Or are there any other ways to cut and concatenate MP4 files?

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Hi Florian. Facing the same issue, I'm curious to learn what you ended up doing. –  Campiador Apr 14 at 7:52

1 Answer 1

you are only mapping the first 3 tracks.

ffmpeg.exe -i ..\..\validate\20140225095504.mp4 -map 0:0 -map 0:1 -map 0:2 ...

Normally it should work, but have you tried to map all 5 tracks?

Also i've noticed that the metadata has changed in your output file.

Original: handler_name    : Video Stream
Output:   handler_name    : VideoHandler

The same for audio tracks. Try to use -map_metadata and set them as in original file.

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