+ } else if (_audio_stream >= 0 && _packet.stream_index == _audio_stream && _opt->decode_audio && _first_video && _first_video.get() <= pts_seconds) {
+
+ /* Note: We only decode audio if we've had our first video packet through, and if it
+ was before this packet. Until then audio is thrown away.
+ */
+
+ if (!_first_audio) {
+ _first_audio = pts_seconds;
+
+ /* This is our first audio packet, and if we've arrived here we must have had our
+ first video packet. Push some silence to make up the gap between our first
+ video packet and our first audio.
+ */
+
+ /* frames of silence that we must push */
+ int const s = rint ((_first_audio.get() - _first_video.get()) * audio_sample_rate ());
+
+ _log->log (
+ String::compose (
+ "First video at %1, first audio at %2, pushing %3 frames of silence for %4 channels (%5 bytes per sample)",
+ _first_video.get(), _first_audio.get(), s, audio_channels(), bytes_per_audio_sample()
+ )
+ );
+
+ /* hence bytes */
+ int const b = s * audio_channels() * bytes_per_audio_sample();
+
+ /* XXX: this assumes that it won't be too much, and there are shaky assumptions
+ that all sound representations are silent with memset()ed zero data.
+ */
+ uint8_t silence[b];
+ memset (silence, 0, b);
+ process_audio (silence, b);
+ }