[Bug] DVR mp4 recording failure for H.265 streams

[suzp1984]

Describe the bug
DVR not works for H.265 streams.

Version
develop branch (6.0release branch has same problem)

To Reproduce
Steps to reproduce the behavior:

1. checkout to develop branch, and compile the project
2. ./objs/srs -c conf/dvr.mp4.conf
3. ffmpeg -stream_loop 0 -re -i doc/source.flv -c:v libx265 -preset medium -crf 23 -acodec copy -f flv rtmp://localhost/live/mp
   or ffmpeg -stream_loop 0 -re -i doc/source.flv -vcodec hevc -acodec copy -f flv rtmp://localhost/live/mp
4. See error log output:

[2025-12-05 01:03:10.585][WARN][44814][uw88b265][35] dvr: ignore video error code=3100(Mp4HvcCChange)(MP4 does not support video HvcC change) : write video : encode video : write sample : doesn't support hvcC change
thread [44814][uw88b265]: on_video() [./src/app/srs_app_dvr.cpp:687][errno=35]
thread [44814][uw88b265]: write_video() [./src/app/srs_app_dvr.cpp:176][errno=35]
thread [44814][uw88b265]: encode_video() [./src/app/srs_app_dvr.cpp:517][errno=35]
thread [44814][uw88b265]: copy_sequence_header() [./src/kernel/srs_kernel_mp4.cpp:6943][errno=35]
[2025-12-05 01:03:10.585][WARN][44814][uw88b265][35] ignore dvr segment close failed. ret=3076

Expected behavior
The DVR mp4 with h.265 data can generated successfully.

[suzp1984]

Cause

srs/trunk/src/kernel/srs_kernel_packet.cpp

Lines 645 to 648 in a83c902

	if (video_->frame_type_ == SrsVideoAvcFrameTypeVideoInfoFrame) {
	srs_warn("avc ignore the info frame");
	return err;
	}

When SrsFormat parse the video flv frame, and it will ignore the video info frame type, but it forget to init/reassign the avc_packet_type_, which already parsed as SrsVideoHEVCFrameTraitPacketTypeMetadata (4) for Hevc stream. The avc_packet_type_ is uninitialized or still keep the previous flv frame's value, which is SrsVideoAvcFrameTraitSequenceHeader (0).

In the DVR module, when this video info frame are recording to the mp4:

srs/trunk/src/kernel/srs_kernel_mp4.cpp

Lines 6627 to 6633 in a83c902

	bool vsh = (ht == SrsMp4HandlerTypeVIDE) && (ct == (uint16_t)SrsVideoAvcFrameTraitSequenceHeader);
	bool ash = (ht == SrsMp4HandlerTypeSOUN) && (ct == (uint16_t)SrsAudioAacFrameTraitSequenceHeader);
	if (vsh || ash) {
	err = copy_sequence_header(format, vsh, sample, nb_sample);
	srs_freep(ps);
	return err;
	}

Because the ct here is the uninitialized/unassigned avc_packet_type_, which is SrsVideoAvcFrameTraitSequenceHeader, vsh = true here, and the real hevc sequence header already be recorded, then the error happened on:

srs/trunk/src/kernel/srs_kernel_mp4.cpp

Lines 6938 to 6944 in a83c902

	if (format->vcodec_->id_ == SrsVideoCodecIdHEVC && !phvcc_.empty()) {
	if (nb_sample == (uint32_t)phvcc_.size() && srs_bytes_equal(sample, &phvcc_[0], (int)phvcc_.size())) {
	return err;
	}
	return srs_error_new(ERROR_MP4_HVCC_CHANGE, "doesn't support hvcC change");
	}

---

The rtmp frame type video info (SrsVideoAvcFrameTypeVideoInfoFrame = 5) only appears in hevc stream.

Solution

Assign avc_packet_type_ to its value, when flv frame type is video info frame.

[suzp1984]

6.0release branch has same problem.

[suzp1984]

#4604 : for develop branch.
#4605 : for 6.0release branch.