iOS 15 or above Safari browser cannot play pure audio HLS.

[JalySN]

Locating the problem, the PMT writing information defaults to including the video field. Use ffplay to locate the warning.
Could not find codec parameters for stream 1 (Video: h264 ([27][0][0][0] / 0x001B)

Upon checking the code, it was found that in the corresponding function SrsTsPacket::create_pmt, the video type should not be push_backed in the case of pure audio.

// if h.264 specified, use video to carry pcr.
if (vs == SrsTsStreamVideoH264) {
    pmt->PCR_PID = vpid;
    pmt->infos.push_back(new SrsTsPayloadPMTESInfo(vs, vpid));
}

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[winlinvip]

👍 You can submit a PR, please refer to https://github.com/ossrs/srs/blob/develop/CONTRIBUTING.md for details. Make sure to maintain the markdown structure.

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[gaecom]

iOS 15+ cannot play all HLS videos. After inspection, it is necessary to generate.

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[gaecom]

In the m3u8 file, the #EXTINF:2.000000 format should not have any numbers after the decimal point. It must be an integer or a format like 4.000, not 4.001.
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:2
#EXT-X-MEDIA-SEQUENCE:13
#EXTINF:2.000000,
abc13.ts
#EXTINF:2.000000,
abc14.ts
#EXTINF:2.000000,
abc15.ts
#EXTINF:2.000000,
abc16.ts
#EXTINF:2.000000,
abc17.ts

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[gaecom]

Because of this issue, the temporary solution can only use ffmpeg, which leads to the need to add ffmpeg for HLS segmentation, even though the original several hundred video streams were fine with SRS built-in HLS segmentation. This results in a sharp increase in hardware resource requirements.

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