Function start_time_fallback

src/decoder/plugins/FfmpegDecoderPlugin.cxx:162–166

* Accessor for AVStream::start_time that replaces AV_NOPTS_VALUE with * zero. We can't use AV_NOPTS_VALUE in calculations, and we simply * assume that the stream's start time is zero, which appears to be * the best way out of that situation. */

 * the best way out of that situation.
 */
static constexpr int64_t
start_time_fallback(const AVStream &stream)
{
	return FfmpegTimestampFallback(stream.start_time, 0);
}

/**
 * Convert AVPacket::pts to a stream-relative time stamp (still in