[FFmpeg-devel] [PATCH] lavf/mov.c: Set start_time for all sterams (in case of edit lists).

[isasi at google.com]

From: Sasi Inguva <isasi at google.com>

Fixes vorbis mp4 audio files, with edit list specified. Since
st->skip_samples is not set in case of vorbis , ffmpeg computes the
start_time as negative.

Signed-off-by: Sasi Inguva <isasi at google.com>
---
 libavformat/mov.c                              | 4 ++--
 tests/fate/mov.mak                             | 5 +++++
 tests/ref/fate/mov-neg-firstpts-discard-vorbis | 3 +++
 3 files changed, 10 insertions(+), 2 deletions(-)
 create mode 100644 tests/ref/fate/mov-neg-firstpts-discard-vorbis

diff --git a/libavformat/mov.c b/libavformat/mov.c
index 82cd410a72..c0f90edef7 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -3684,9 +3684,9 @@ static void mov_fix_index(MOVContext *mov, AVStream *st)
                 st->index_entries[i].timestamp -= msc->min_corrected_pts;
             }
         }
-        // Start time should be equal to zero or the duration of any empty edits.
-        st->start_time = empty_edits_sum_duration;
     }
+    // Start time should be equal to zero or the duration of any empty edits.
+    st->start_time = empty_edits_sum_duration;
 
     // Update av stream length, if it ends up shorter than the track's media duration
     st->duration = FFMIN(st->duration, edit_list_dts_entry_end - start_dts);
diff --git a/tests/fate/mov.mak b/tests/fate/mov.mak
index 6f0e28d21e..3d9e4280bb 100644
--- a/tests/fate/mov.mak
+++ b/tests/fate/mov.mak
@@ -19,6 +19,7 @@ FATE_MOV = fate-mov-3elist \
            fate-mov-stream-shorter-than-movie \
 
 FATE_MOV_FFPROBE = fate-mov-neg-firstpts-discard \
+                   fate-mov-neg-firstpts-discard-vorbis \
                    fate-mov-aac-2048-priming \
                    fate-mov-zombie \
                    fate-mov-init-nonkeyframe \
@@ -89,6 +90,10 @@ fate-mov-bbi-elst-starts-b: CMD = framemd5 -flags +bitexact -acodec aac_fixed -i
 # Makes sure that the stream start_time is not negative when the first packet is a DISCARD packet with negative timestamp.
 fate-mov-neg-firstpts-discard: CMD = run ffprobe$(PROGSSUF)$(EXESUF) -show_entries stream=start_time -bitexact $(TARGET_SAMPLES)/mov/mov_neg_first_pts_discard.mov
 
+# Makes sure that the VORBIS audio stream start_time is not negative when the first few packets are DISCARD packets
+# with negative timestamps (skip_samples is not set for Vorbis, so ffmpeg computes start_time as negative if not specified by demuxer).
+fate-mov-neg-firstpts-discard-vorbis: CMD = run ffprobe$(PROGSSUF)$(EXESUF) -show_entries stream=start_time -bitexact $(TARGET_SAMPLES)/mov/mov_neg_first_pts_discard_vorbis.mp4
+
 # Makes sure that expected frames are generated for mov_neg_first_pts_discard.mov with -vsync 1
 fate-mov-neg-firstpts-discard-frames: CMD = framemd5 -flags +bitexact -i $(TARGET_SAMPLES)/mov/mov_neg_first_pts_discard.mov -vsync 1
 
diff --git a/tests/ref/fate/mov-neg-firstpts-discard-vorbis b/tests/ref/fate/mov-neg-firstpts-discard-vorbis
new file mode 100644
index 0000000000..2e295e3b68
--- /dev/null
+++ b/tests/ref/fate/mov-neg-firstpts-discard-vorbis
@@ -0,0 +1,3 @@
+[STREAM]
+start_time=0.000000
+[/STREAM]
-- 
2.18.0.597.ga71716f1ad-goog