lavf/mov.c: Use the correct offset to shift timestamp when seeking.

Fixes seek for files with empty edits and files with negative ctts
(dts_shift > 0). Added fate samples and tests.

Signed-off-by: Sasi Inguva <isasi@isasi.mtv.corp.google.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

3 files changed, 378 insertions, 0 deletions

diff --git a/tests/ref/seek/empty-edit-mp4 b/tests/ref/seek/empty-edit-mp4
new file mode 100644
index 0000000..f0a4ad3
--- /dev/null
+++ b/tests/ref/seek/empty-edit-mp4
@@ -0,0 +1,134 @@
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diff --git a/tests/ref/seek/test-iibbibb-mp4 b/tests/ref/seek/test-iibbibb-mp4
new file mode 100644
index 0000000..5a89600
--- /dev/null
+++ b/tests/ref/seek/test-iibbibb-mp4
@@ -0,0 +1,122 @@
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diff --git a/tests/ref/seek/test-iibbibb-neg-ctts-mp4 b/tests/ref/seek/test-iibbibb-neg-ctts-mp4
new file mode 100644
index 0000000..5a89600
--- /dev/null
+++ b/tests/ref/seek/test-iibbibb-neg-ctts-mp4
@@ -0,0 +1,122 @@
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+ret:-EOF
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+ret:-EOF
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+ret:-EOF
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+ret:-EOF
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+ret:-EOF
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