fftools/ffmpeg: pre-compute the streamcopy start pts before transcoding starts

InputFile.ts_offset can change during transcoding, due to discontinuity
correction. This should not affect the streamcopy starting timestamp.

Cf. bf2590aed3e64d44a5e2430fdbe89f91f5e55bfe

1 files changed, 6 insertions, 0 deletions

diff --git a/fftools/ffmpeg.h b/fftools/ffmpeg.h
index 2ac7cbe522..8b2e73d642 100644
--- a/fftools/ffmpeg.h
+++ b/fftools/ffmpeg.h
@@ -484,6 +484,12 @@ typedef struct OutputStream {
     int64_t last_mux_dts;
     /* pts of the last frame received from the filters, in AV_TIME_BASE_Q */
     int64_t last_filter_pts;
+
+    // timestamp from which the streamcopied streams should start,
+    // in AV_TIME_BASE_Q;
+    // everything before it should be discarded
+    int64_t ts_copy_start;
+
     // the timebase of the packets sent to the muxer
     AVRational mux_timebase;
     AVRational enc_timebase;