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PS input: improve video type detection for MPEG-1/2 vs. AVC/h.264

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Fixes #845.
This commit is contained in:
Moritz Bunkus 2013-02-24 13:33:16 +01:00
parent 77c126c2c6
commit 14d7db97ed
4 changed files with 35 additions and 8 deletions
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3
ChangeLog
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@ -1,5 +1,8 @@
2013-02-24 Moritz Bunkus <moritz@bunkus.org>
* mkvmerge: bug fix: Fixed mkvmerge sometimes mistakenly detecting
MPEG-1 video in MPEG program streams as AVC/h.264. Fixes #845.
* mmg: new feature: When a playlist file (e.g. MPLS Blu-ray
playlist) is added mmg can optionally scan all the other files in
the directory that have the same extension and present the user

34
src/input/r_mpeg_ps.cpp
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@ -487,6 +487,24 @@ mpeg_ps_reader_c::new_stream_v_avc_or_mpeg_1_2(mpeg_ps_id_t id,
uint64_t marker = 0;
int pos = 0;
while (4 > buffer.get_size()) {
if (!find_next_packet_for_id(id, PS_PROBE_SIZE))
throw false;
auto packet = parse_packet(id);
if (!packet)
continue;
buffer.add(packet.m_buffer->get_buffer(), packet.m_length);
}
marker = get_uint32_be(buffer.get_buffer());
if (NALU_START_CODE == marker) {
m_in->restore_pos();
new_stream_v_avc(id, buf, length, track);
return;
}
while (1) {
unsigned char *ptr = buffer.get_buffer();
int buffer_size = buffer.get_size();
@ -521,13 +539,6 @@ mpeg_ps_reader_c::new_stream_v_avc_or_mpeg_1_2(mpeg_ps_id_t id,
avc_access_unit_found = true;
break;
}
if (avc_seq_param_found && avc_pic_param_found && (avc_access_unit_found || avc_slice_found)) {
m_in->restore_pos();
new_stream_v_avc(id, buf, length, track);
return;
}
}
if (mpeg_is_start_code(marker)) {
@ -551,7 +562,7 @@ mpeg_ps_reader_c::new_stream_v_avc_or_mpeg_1_2(mpeg_ps_id_t id,
}
if (!find_next_packet_for_id(id, PS_PROBE_SIZE))
throw false;
break;
auto packet = parse_packet(id);
if (!packet)
@ -559,6 +570,13 @@ mpeg_ps_reader_c::new_stream_v_avc_or_mpeg_1_2(mpeg_ps_id_t id,
buffer.add(packet.m_buffer->get_buffer(), packet.m_length);
}
if (avc_seq_param_found && avc_pic_param_found && (avc_access_unit_found || avc_slice_found)) {
m_in->restore_pos();
new_stream_v_avc(id, buf, length, track);
return;
}
} catch (...) {
}

1
tests/results.txt
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@ -234,3 +234,4 @@ T_385split_parts_frames:14add8af7d016c048f0828708af04a86+c787a3d20fe2c26f7e0e031
T_386flv_vp6f:a0ab8eb0dedf2c8c472e818794c2ad64:passed:20130121-223417:0.187881106
T_387mp4_free_invalid_size:f3deb6abb3f60c0de606e166353a71b1:passed:20130216-003333:0.04107827
T_388split_parts_and_chapters:e1bc3ec155ec33bca8eec967aceab25a-389c3bd6f8eca14fea4ef663a59b2e83-04fa29b52eb8d4962edf4f010548b375:passed:20130216-203522:0.690018077
T_389mpeg1_in_ps_misdetected_as_avc:31ba2275cda1531973423ad509013fdb:passed:20130224-132738:1.205560654

5
tests/test-389mpeg1_in_ps_misdetected_as_avc.rb Normal file
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@ -0,0 +1,5 @@
#!/usr/bin/ruby -w
# T_389mpeg1_in_ps_misdetected_as_avc
describe "mkvmerge / MPEG-1 in program stream misdetected as AVC"
test_merge "data/mpeg12/mpeg1-misdetected-as-avc.mpg"